ZnSe nanostructured thin films are found to be potential candidates in various optoelectronic applications. They find applications in LEDs, buffer layer of photovoltaic cell etc. The samples were fabricated by a cost effective modified chemical route namely photo enhanced chemical deposition technique. The deposition of nanostructured ZnSe thin films took place from aqueous alkaline medium. The deposition bath at room temperature was illuminated by a UV lamp irradiating at 355 nm. Deposition solution contained zinc sulphate, sodium sulphite, sodium selenosulphate, hydrazine hydrate and triethanol ammine (TEA). The films were uniform and highly adherent. The films were deposited on soda lime glass substrate with various concentrations of ethanol in the deposition bath. The resulting samples were annealed at 373 K for 30 minutes. The deposited films were characterised by various techniques like XRD, UV-VIS-NIR spectrophotometer, SEM etc. The films were found to be polycrystalline in nature with hexagonal structures and addition of ethanol in the bath resulted in face centered cubic structure. The presence of ethanol in the bath introduced changes in structural, optical, and morphological properties of the thin films. The optical transmission of all the samples were above 70% in the visible region and almost uniform. The optical band gap found to decrease with increase in ethanol concentration from 2.74 eV to 2.52 eV whereas the grain size found to increase. The SEM images showed a porous structure which changed to nano flake like structure on the addition of ethanol in to the deposition bath.ZnSe nanostructured thin films are found to be potential candidates in various optoelectronic applications. They find applications in LEDs, buffer layer of photovoltaic cell etc. The samples were fabricated by a cost effective modified chemical route namely photo enhanced chemical deposition technique. The deposition of nanostructured ZnSe thin films took place from aqueous alkaline medium. The deposition bath at room temperature was illuminated by a UV lamp irradiating at 355 nm. Deposition solution contained zinc sulphate, sodium sulphite, sodium selenosulphate, hydrazine hydrate and triethanol ammine (TEA). The films were uniform and highly adherent. The films were deposited on soda lime glass substrate with various concentrations of ethanol in the deposition bath. The resulting samples were annealed at 373 K for 30 minutes. The deposited films were characterised by various techniques like XRD, UV-VIS-NIR spectrophotometer, SEM etc. The films were found to be polycrystalline in nature with hexagonal st...
{"title":"Effect of ethanol concentration in photo enhanced chemically deposited ZnSe thin films","authors":"P. Geethanjali, T. Remadevi","doi":"10.1063/1.5130371","DOIUrl":"https://doi.org/10.1063/1.5130371","url":null,"abstract":"ZnSe nanostructured thin films are found to be potential candidates in various optoelectronic applications. They find applications in LEDs, buffer layer of photovoltaic cell etc. The samples were fabricated by a cost effective modified chemical route namely photo enhanced chemical deposition technique. The deposition of nanostructured ZnSe thin films took place from aqueous alkaline medium. The deposition bath at room temperature was illuminated by a UV lamp irradiating at 355 nm. Deposition solution contained zinc sulphate, sodium sulphite, sodium selenosulphate, hydrazine hydrate and triethanol ammine (TEA). The films were uniform and highly adherent. The films were deposited on soda lime glass substrate with various concentrations of ethanol in the deposition bath. The resulting samples were annealed at 373 K for 30 minutes. The deposited films were characterised by various techniques like XRD, UV-VIS-NIR spectrophotometer, SEM etc. The films were found to be polycrystalline in nature with hexagonal structures and addition of ethanol in the bath resulted in face centered cubic structure. The presence of ethanol in the bath introduced changes in structural, optical, and morphological properties of the thin films. The optical transmission of all the samples were above 70% in the visible region and almost uniform. The optical band gap found to decrease with increase in ethanol concentration from 2.74 eV to 2.52 eV whereas the grain size found to increase. The SEM images showed a porous structure which changed to nano flake like structure on the addition of ethanol in to the deposition bath.ZnSe nanostructured thin films are found to be potential candidates in various optoelectronic applications. They find applications in LEDs, buffer layer of photovoltaic cell etc. The samples were fabricated by a cost effective modified chemical route namely photo enhanced chemical deposition technique. The deposition of nanostructured ZnSe thin films took place from aqueous alkaline medium. The deposition bath at room temperature was illuminated by a UV lamp irradiating at 355 nm. Deposition solution contained zinc sulphate, sodium sulphite, sodium selenosulphate, hydrazine hydrate and triethanol ammine (TEA). The films were uniform and highly adherent. The films were deposited on soda lime glass substrate with various concentrations of ethanol in the deposition bath. The resulting samples were annealed at 373 K for 30 minutes. The deposited films were characterised by various techniques like XRD, UV-VIS-NIR spectrophotometer, SEM etc. The films were found to be polycrystalline in nature with hexagonal st...","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":"48 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76691439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Electromagnetic interference shielding effectiveness (EMI SE) of multifunctional NiCuZnFe2O4-Polyaniline are studied. The nanocrystalline NCZ–PANI nanocomposites were prepared by the mechanical milling process. The structure and the morphology of the nanocomposites were investigated by Fourier Infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). Electromagnetic properties and EMI SE behaviors were performed over a frequency range of 8.2-12.4 GHz (X-band) and 12.4–18 GHz (Ku-band). The results show that for nanocomposites, the values of the real (e′) and imaginary permittivity (e″) and imaginary permeability (µ″) increase, while the value of real permeability (µ′) decreases as the filler content (PANI) increases. The contributing effects of PANI content on total shielding efficiency (SEtotal) of different samples were investigated. The maximum EMI SE of 29 dB is obtained for a composite of 50 wt.% PANI with the dominant shielding by absorption (SEA) of electromagnetic radiation. The enhanced electromagnetic shielding performance of nanocomposites is attributed to the increment of both magnetic and dielectric losses due to the incorporation of conducting PANI in magnetic NCZ matrix. Synthesis parameters such as the amount and particle size of PANI and NCZ affect significantly the morphology, the conductivity, and the microwave absorption properties of the final materials. The possibility to modulate the electromagnetic properties of the composite materials is of great interest to fabricate microwave absorbing and electromagnetic shielding materials with high performances.Electromagnetic interference shielding effectiveness (EMI SE) of multifunctional NiCuZnFe2O4-Polyaniline are studied. The nanocrystalline NCZ–PANI nanocomposites were prepared by the mechanical milling process. The structure and the morphology of the nanocomposites were investigated by Fourier Infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). Electromagnetic properties and EMI SE behaviors were performed over a frequency range of 8.2-12.4 GHz (X-band) and 12.4–18 GHz (Ku-band). The results show that for nanocomposites, the values of the real (e′) and imaginary permittivity (e″) and imaginary permeability (µ″) increase, while the value of real permeability (µ′) decreases as the filler content (PANI) increases. The contributing effects of PANI content on total shielding efficiency (SEtotal) of different samples were investigated. The maximum EMI SE of 29 dB is obtained for a composite of 50 wt.% PANI with the dominant shielding by absorption (SEA) of electromagnetic radiation. The enhance...
{"title":"Shielding effectiveness studies of NiCuZn ferrite-polyaniline nanocomposites for EMI suppression applications","authors":"P. Raju, J. Shankar, J. Anjaiah, S. Murthy","doi":"10.1063/1.5130237","DOIUrl":"https://doi.org/10.1063/1.5130237","url":null,"abstract":"Electromagnetic interference shielding effectiveness (EMI SE) of multifunctional NiCuZnFe2O4-Polyaniline are studied. The nanocrystalline NCZ–PANI nanocomposites were prepared by the mechanical milling process. The structure and the morphology of the nanocomposites were investigated by Fourier Infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). Electromagnetic properties and EMI SE behaviors were performed over a frequency range of 8.2-12.4 GHz (X-band) and 12.4–18 GHz (Ku-band). The results show that for nanocomposites, the values of the real (e′) and imaginary permittivity (e″) and imaginary permeability (µ″) increase, while the value of real permeability (µ′) decreases as the filler content (PANI) increases. The contributing effects of PANI content on total shielding efficiency (SEtotal) of different samples were investigated. The maximum EMI SE of 29 dB is obtained for a composite of 50 wt.% PANI with the dominant shielding by absorption (SEA) of electromagnetic radiation. The enhanced electromagnetic shielding performance of nanocomposites is attributed to the increment of both magnetic and dielectric losses due to the incorporation of conducting PANI in magnetic NCZ matrix. Synthesis parameters such as the amount and particle size of PANI and NCZ affect significantly the morphology, the conductivity, and the microwave absorption properties of the final materials. The possibility to modulate the electromagnetic properties of the composite materials is of great interest to fabricate microwave absorbing and electromagnetic shielding materials with high performances.Electromagnetic interference shielding effectiveness (EMI SE) of multifunctional NiCuZnFe2O4-Polyaniline are studied. The nanocrystalline NCZ–PANI nanocomposites were prepared by the mechanical milling process. The structure and the morphology of the nanocomposites were investigated by Fourier Infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). Electromagnetic properties and EMI SE behaviors were performed over a frequency range of 8.2-12.4 GHz (X-band) and 12.4–18 GHz (Ku-band). The results show that for nanocomposites, the values of the real (e′) and imaginary permittivity (e″) and imaginary permeability (µ″) increase, while the value of real permeability (µ′) decreases as the filler content (PANI) increases. The contributing effects of PANI content on total shielding efficiency (SEtotal) of different samples were investigated. The maximum EMI SE of 29 dB is obtained for a composite of 50 wt.% PANI with the dominant shielding by absorption (SEA) of electromagnetic radiation. The enhance...","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":"73 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79667947","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J. Shankar, G. Rani, J. Anjaiah, P. Raju, V. Deshpande
Glass samples with composition (35-X) B2O3 − (40 +X) PbO - 25 TiO2 (where X= 0, 2.5,5, 7.5 and 10 mol %) were prepared using conventional quenching technique. It was observed that as PbO content increases the values glass transition temperature (Tg) and crystallization temperature (Tc) decreases. The replacement of boron by a bigger Pb ion expands the network there by reducing the glass transition temperature (Tg). These glass samples were converted to glass ceramics by following two stage heat treatment schedule. The density(ρ) values of glass ceramic samples are higher than those of corresponding glass samples. It was observed that there was good correlation between the density and Coefficient of Thermal Expansion (CTE) results of the glass–ceramics. The XRD results in the glass ceramics revealed the formation of tetragonal lead titanate (PbTiO3) as a major crystalline phase and lead borate (PbB2O4) as minor crystalline phase. The microstructure of glass ceramic samples contains nano crystallites of lead titanate embedded in a borate glass matrix. As the content of glass former (B2O3) is reduced, the PbTiO3 crystals precipitated in glass matrix are observed to increase. The dielectric constant values of glass ceramic samples are higher than those of corresponding glass samples.Glass samples with composition (35-X) B2O3 − (40 +X) PbO - 25 TiO2 (where X= 0, 2.5,5, 7.5 and 10 mol %) were prepared using conventional quenching technique. It was observed that as PbO content increases the values glass transition temperature (Tg) and crystallization temperature (Tc) decreases. The replacement of boron by a bigger Pb ion expands the network there by reducing the glass transition temperature (Tg). These glass samples were converted to glass ceramics by following two stage heat treatment schedule. The density(ρ) values of glass ceramic samples are higher than those of corresponding glass samples. It was observed that there was good correlation between the density and Coefficient of Thermal Expansion (CTE) results of the glass–ceramics. The XRD results in the glass ceramics revealed the formation of tetragonal lead titanate (PbTiO3) as a major crystalline phase and lead borate (PbB2O4) as minor crystalline phase. The microstructure of glass ceramic samples contains nano crystallites of lea...
{"title":"Study of microstructure and dielectric properties of PbTiO3 based glass ceramics","authors":"J. Shankar, G. Rani, J. Anjaiah, P. Raju, V. Deshpande","doi":"10.1063/1.5130255","DOIUrl":"https://doi.org/10.1063/1.5130255","url":null,"abstract":"Glass samples with composition (35-X) B2O3 − (40 +X) PbO - 25 TiO2 (where X= 0, 2.5,5, 7.5 and 10 mol %) were prepared using conventional quenching technique. It was observed that as PbO content increases the values glass transition temperature (Tg) and crystallization temperature (Tc) decreases. The replacement of boron by a bigger Pb ion expands the network there by reducing the glass transition temperature (Tg). These glass samples were converted to glass ceramics by following two stage heat treatment schedule. The density(ρ) values of glass ceramic samples are higher than those of corresponding glass samples. It was observed that there was good correlation between the density and Coefficient of Thermal Expansion (CTE) results of the glass–ceramics. The XRD results in the glass ceramics revealed the formation of tetragonal lead titanate (PbTiO3) as a major crystalline phase and lead borate (PbB2O4) as minor crystalline phase. The microstructure of glass ceramic samples contains nano crystallites of lead titanate embedded in a borate glass matrix. As the content of glass former (B2O3) is reduced, the PbTiO3 crystals precipitated in glass matrix are observed to increase. The dielectric constant values of glass ceramic samples are higher than those of corresponding glass samples.Glass samples with composition (35-X) B2O3 − (40 +X) PbO - 25 TiO2 (where X= 0, 2.5,5, 7.5 and 10 mol %) were prepared using conventional quenching technique. It was observed that as PbO content increases the values glass transition temperature (Tg) and crystallization temperature (Tc) decreases. The replacement of boron by a bigger Pb ion expands the network there by reducing the glass transition temperature (Tg). These glass samples were converted to glass ceramics by following two stage heat treatment schedule. The density(ρ) values of glass ceramic samples are higher than those of corresponding glass samples. It was observed that there was good correlation between the density and Coefficient of Thermal Expansion (CTE) results of the glass–ceramics. The XRD results in the glass ceramics revealed the formation of tetragonal lead titanate (PbTiO3) as a major crystalline phase and lead borate (PbB2O4) as minor crystalline phase. The microstructure of glass ceramic samples contains nano crystallites of lea...","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":"52 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83974279","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In the present study PVOH (polyvinyl Alcohol) has been used as the modifier for kaolin for its application as the barrier coating on the surface of paper. Food packaging is the essential part of nowadays lifestyle. Food package requires protection from the environmental factors like oxygen, carbon dioxide, temperature and moisture. Synthetic polymers like PVOH, EVOH (ethyl vinyl alchohol) showed high barrier property against the oxygen permeability. Kaolinite (Al2Si2O5(OH)4) is a 1:1 phyllosilicate clay which consists of an octahedral layer of gibbsite and a tetrahedral layer of silicon oxide. Our study involves the synthesis of nano –kaolin by pre-treatment of native kaolin with DMSO and further modifies with PVOH. Modified nano-kaolin was analyzed using DLS (Dynamic Light Scattering), FTIR (Fourier Transform Infrared Spectra), XRD (X-ray Diffraction) and FESEM (Field Emission Scanning Electron Microscopy) for the particle size distribution, functional properties, crystalline structure and morphology respectively. PVOH modified kaolin with different size distribution may provide the high barrier against the permeability of oxygen by providing more tortuous pathway to oxygen molecules.In the present study PVOH (polyvinyl Alcohol) has been used as the modifier for kaolin for its application as the barrier coating on the surface of paper. Food packaging is the essential part of nowadays lifestyle. Food package requires protection from the environmental factors like oxygen, carbon dioxide, temperature and moisture. Synthetic polymers like PVOH, EVOH (ethyl vinyl alchohol) showed high barrier property against the oxygen permeability. Kaolinite (Al2Si2O5(OH)4) is a 1:1 phyllosilicate clay which consists of an octahedral layer of gibbsite and a tetrahedral layer of silicon oxide. Our study involves the synthesis of nano –kaolin by pre-treatment of native kaolin with DMSO and further modifies with PVOH. Modified nano-kaolin was analyzed using DLS (Dynamic Light Scattering), FTIR (Fourier Transform Infrared Spectra), XRD (X-ray Diffraction) and FESEM (Field Emission Scanning Electron Microscopy) for the particle size distribution, functional properties, crystalline structure and morphology res...
{"title":"PVOH modified nano-kaolin as barrier coating material for food packaging application","authors":"Vaishali Saroha, D. Dutt, A. Bhowmick","doi":"10.1063/1.5130211","DOIUrl":"https://doi.org/10.1063/1.5130211","url":null,"abstract":"In the present study PVOH (polyvinyl Alcohol) has been used as the modifier for kaolin for its application as the barrier coating on the surface of paper. Food packaging is the essential part of nowadays lifestyle. Food package requires protection from the environmental factors like oxygen, carbon dioxide, temperature and moisture. Synthetic polymers like PVOH, EVOH (ethyl vinyl alchohol) showed high barrier property against the oxygen permeability. Kaolinite (Al2Si2O5(OH)4) is a 1:1 phyllosilicate clay which consists of an octahedral layer of gibbsite and a tetrahedral layer of silicon oxide. Our study involves the synthesis of nano –kaolin by pre-treatment of native kaolin with DMSO and further modifies with PVOH. Modified nano-kaolin was analyzed using DLS (Dynamic Light Scattering), FTIR (Fourier Transform Infrared Spectra), XRD (X-ray Diffraction) and FESEM (Field Emission Scanning Electron Microscopy) for the particle size distribution, functional properties, crystalline structure and morphology respectively. PVOH modified kaolin with different size distribution may provide the high barrier against the permeability of oxygen by providing more tortuous pathway to oxygen molecules.In the present study PVOH (polyvinyl Alcohol) has been used as the modifier for kaolin for its application as the barrier coating on the surface of paper. Food packaging is the essential part of nowadays lifestyle. Food package requires protection from the environmental factors like oxygen, carbon dioxide, temperature and moisture. Synthetic polymers like PVOH, EVOH (ethyl vinyl alchohol) showed high barrier property against the oxygen permeability. Kaolinite (Al2Si2O5(OH)4) is a 1:1 phyllosilicate clay which consists of an octahedral layer of gibbsite and a tetrahedral layer of silicon oxide. Our study involves the synthesis of nano –kaolin by pre-treatment of native kaolin with DMSO and further modifies with PVOH. Modified nano-kaolin was analyzed using DLS (Dynamic Light Scattering), FTIR (Fourier Transform Infrared Spectra), XRD (X-ray Diffraction) and FESEM (Field Emission Scanning Electron Microscopy) for the particle size distribution, functional properties, crystalline structure and morphology res...","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":"36 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81694163","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Mobility of carriers is one of the pivotal parameters characterizing any semiconducting material and it is important for organic semiconductors too. The mobility of organic semiconductors remains far less when compared to inorganic counterparts and hence attempts in the direction improvise it carries tremendous significance. This paper investigates the positive charge carriers transport properties in a bulk heterojunction organic photovoltaic cell using two different Anode Buffer Layers (PEDOT:PSS and MoO3). The method of Space Charge Limited Current (SCLC) is used to compute the hole mobilities and also the values are compared. The values obtained with PEDOT:PSS and MoO3 as HTLs are 1.043x10−4 cm2 V−1S−1 and 1.357x10−4 cm2V−1S−1 respectively. It is seen that the device with higher carrier mobility exhibits better performance.
{"title":"Measurement of hole mobility in P3HT based photovoltaic cell using space charge limited current method","authors":"K. Kumary, M. Pratheek, T. A. Hameed, P. Predeep","doi":"10.1063/1.5130352","DOIUrl":"https://doi.org/10.1063/1.5130352","url":null,"abstract":"Mobility of carriers is one of the pivotal parameters characterizing any semiconducting material and it is important for organic semiconductors too. The mobility of organic semiconductors remains far less when compared to inorganic counterparts and hence attempts in the direction improvise it carries tremendous significance. This paper investigates the positive charge carriers transport properties in a bulk heterojunction organic photovoltaic cell using two different Anode Buffer Layers (PEDOT:PSS and MoO3). The method of Space Charge Limited Current (SCLC) is used to compute the hole mobilities and also the values are compared. The values obtained with PEDOT:PSS and MoO3 as HTLs are 1.043x10−4 cm2 V−1S−1 and 1.357x10−4 cm2V−1S−1 respectively. It is seen that the device with higher carrier mobility exhibits better performance.","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78570359","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A chalcone derivative (2E)-3-(4-bromophenyl)-1-(4-methoxyphenyl)prop-2-en-1-one (BMC) has been synthesized and grown into single crystal. Elemental analysis, Fourier transform infrared spectroscopy, nuclear magnetic resonance spectral analysis and powder X-ray diffraction studies were carried out to confirm the structure of the molecule. The TG/DT analysis shows that the crystal has good thermal stability with a melting point of 159 °C. The UV-Visible absorption study shows that the crystal has good transparency in the visible region with a cutoff wavelength 422 nm and direct transition energy gap of 3.5 eV. The second harmonic generation (SHG) efficiency of BMC was found to be 2.22 U and possess phase matching property. Theoretical calculation of molecular first hyperpolarizability (β) of BMC in gaseous state was computed using density functional theory (DFT) and was found to be 16.5 × 10−30 esu. High thermal stability, good transparency in visible region, good SHG efficiency and phase matching property of BMC makes it a possible potential candidate for NLO device applications.A chalcone derivative (2E)-3-(4-bromophenyl)-1-(4-methoxyphenyl)prop-2-en-1-one (BMC) has been synthesized and grown into single crystal. Elemental analysis, Fourier transform infrared spectroscopy, nuclear magnetic resonance spectral analysis and powder X-ray diffraction studies were carried out to confirm the structure of the molecule. The TG/DT analysis shows that the crystal has good thermal stability with a melting point of 159 °C. The UV-Visible absorption study shows that the crystal has good transparency in the visible region with a cutoff wavelength 422 nm and direct transition energy gap of 3.5 eV. The second harmonic generation (SHG) efficiency of BMC was found to be 2.22 U and possess phase matching property. Theoretical calculation of molecular first hyperpolarizability (β) of BMC in gaseous state was computed using density functional theory (DFT) and was found to be 16.5 × 10−30 esu. High thermal stability, good transparency in visible region, good SHG efficiency and phase matching property ...
{"title":"Single crystal growth, characterization, structure and NLO property relationship in an efficient phase matchable chalcone","authors":"H. R. Puranik, H. J. Ravindra","doi":"10.1063/1.5130258","DOIUrl":"https://doi.org/10.1063/1.5130258","url":null,"abstract":"A chalcone derivative (2E)-3-(4-bromophenyl)-1-(4-methoxyphenyl)prop-2-en-1-one (BMC) has been synthesized and grown into single crystal. Elemental analysis, Fourier transform infrared spectroscopy, nuclear magnetic resonance spectral analysis and powder X-ray diffraction studies were carried out to confirm the structure of the molecule. The TG/DT analysis shows that the crystal has good thermal stability with a melting point of 159 °C. The UV-Visible absorption study shows that the crystal has good transparency in the visible region with a cutoff wavelength 422 nm and direct transition energy gap of 3.5 eV. The second harmonic generation (SHG) efficiency of BMC was found to be 2.22 U and possess phase matching property. Theoretical calculation of molecular first hyperpolarizability (β) of BMC in gaseous state was computed using density functional theory (DFT) and was found to be 16.5 × 10−30 esu. High thermal stability, good transparency in visible region, good SHG efficiency and phase matching property of BMC makes it a possible potential candidate for NLO device applications.A chalcone derivative (2E)-3-(4-bromophenyl)-1-(4-methoxyphenyl)prop-2-en-1-one (BMC) has been synthesized and grown into single crystal. Elemental analysis, Fourier transform infrared spectroscopy, nuclear magnetic resonance spectral analysis and powder X-ray diffraction studies were carried out to confirm the structure of the molecule. The TG/DT analysis shows that the crystal has good thermal stability with a melting point of 159 °C. The UV-Visible absorption study shows that the crystal has good transparency in the visible region with a cutoff wavelength 422 nm and direct transition energy gap of 3.5 eV. The second harmonic generation (SHG) efficiency of BMC was found to be 2.22 U and possess phase matching property. Theoretical calculation of molecular first hyperpolarizability (β) of BMC in gaseous state was computed using density functional theory (DFT) and was found to be 16.5 × 10−30 esu. High thermal stability, good transparency in visible region, good SHG efficiency and phase matching property ...","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":"115 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80837444","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Cobalt ferrite nanosamples are prepared by hydrothermal method and their structural and morphological analysis are conducted by varying hydrothermal reaction time. X-ray diffraction analysis at room temperature confirms the formation of pure phase sample. Samples with size varying from 9.4nm to 28nm were synthesized by varying reaction time from 6hr to 24hr. Both TEM and XRD results match regarding particle size. The particle size is found to increase with increase in reaction time and also an interesting morphology transition from nanospheres to nanocube is observed as reaction time is increased. Magnetic studies are done using VSM analysis at room temperature. Magnetic parameters of importance are extracted from the analysis and the contributions of different magnetization phases to the total magnetization are found using a program developed in python. Excellent fits are obtained for all three samples and from the M-H curve analysis, ferromagnetic and paramagnetic contributions to the magnetization are found. All samples show ferromagnetic and paramagnetic contributions. The nanocube is found to have 74.34% ferromagnetic contribution and 25.65% of Paramagnetic contribution whereas the nanospheres are found to be almost entirely ferromagnetic with 93.8% contribution and only 6.2 % of paramagnetic contribution.
{"title":"Characterization and magnetic phase resolution of CoFe2O4 nanocubes and nanospheres","authors":"Renju Miriam Cheriyan, I. Anila, M. Mathew","doi":"10.1063/1.5130308","DOIUrl":"https://doi.org/10.1063/1.5130308","url":null,"abstract":"Cobalt ferrite nanosamples are prepared by hydrothermal method and their structural and morphological analysis are conducted by varying hydrothermal reaction time. X-ray diffraction analysis at room temperature confirms the formation of pure phase sample. Samples with size varying from 9.4nm to 28nm were synthesized by varying reaction time from 6hr to 24hr. Both TEM and XRD results match regarding particle size. The particle size is found to increase with increase in reaction time and also an interesting morphology transition from nanospheres to nanocube is observed as reaction time is increased. Magnetic studies are done using VSM analysis at room temperature. Magnetic parameters of importance are extracted from the analysis and the contributions of different magnetization phases to the total magnetization are found using a program developed in python. Excellent fits are obtained for all three samples and from the M-H curve analysis, ferromagnetic and paramagnetic contributions to the magnetization are found. All samples show ferromagnetic and paramagnetic contributions. The nanocube is found to have 74.34% ferromagnetic contribution and 25.65% of Paramagnetic contribution whereas the nanospheres are found to be almost entirely ferromagnetic with 93.8% contribution and only 6.2 % of paramagnetic contribution.","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":"552 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73708735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Transition metal oxides of FeO-MnO magnetic hetero nanostructures were prepared by chemical co-precipitation method using a biological surfactant Deoxyribonucleic Acid (DNA). The characterization of the nanoparticles was performed by Energy-dispersive X-ray spectroscopy (EDS), X-Ray Diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Scanning Electron Microscope (SEM), and vibrating-sample magnetometer (VSM). Elemental composition was confirmed by EDS.XRD analysis gave information about the crystallinity and two different phases present in the sample. Optical studies were done using FTIR spectroscopy. The sample morphology was explored in SEM images. Magnetic nature confirmed using VSM analysis. Antimicrobial activities of the samples were investigated against bacteria Staphylococcus aureus(S aureus) and Escherichia Coli (E Coli) were swabbed using agarwell diffusion method. The antioxidant properties of the samples were assessed by using DPPH (2, 2-diphenyl-1-picryl-hydrazyl-hydrate) assay, Hydrogen peroxide, hydroxyl, and superoxide free radicals. The synthesized nanoparticles were shown potential activity in scavenging in vitro DPPH assay. The synthesized nanocomposites having reduced size exhibit better scavenging activity and act as good antioxidant compared to others.Transition metal oxides of FeO-MnO magnetic hetero nanostructures were prepared by chemical co-precipitation method using a biological surfactant Deoxyribonucleic Acid (DNA). The characterization of the nanoparticles was performed by Energy-dispersive X-ray spectroscopy (EDS), X-Ray Diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Scanning Electron Microscope (SEM), and vibrating-sample magnetometer (VSM). Elemental composition was confirmed by EDS.XRD analysis gave information about the crystallinity and two different phases present in the sample. Optical studies were done using FTIR spectroscopy. The sample morphology was explored in SEM images. Magnetic nature confirmed using VSM analysis. Antimicrobial activities of the samples were investigated against bacteria Staphylococcus aureus(S aureus) and Escherichia Coli (E Coli) were swabbed using agarwell diffusion method. The antioxidant properties of the samples were assessed by using DPPH (2, 2-diphenyl-1-picryl-hydrazyl-hydrate) assay...
{"title":"Synthesis and characterization of FeO-MnO magnetic nanoparticles in vitro antioxidant and antibacterial studies","authors":"S. Smitha, N. Tharayil","doi":"10.1063/1.5130365","DOIUrl":"https://doi.org/10.1063/1.5130365","url":null,"abstract":"Transition metal oxides of FeO-MnO magnetic hetero nanostructures were prepared by chemical co-precipitation method using a biological surfactant Deoxyribonucleic Acid (DNA). The characterization of the nanoparticles was performed by Energy-dispersive X-ray spectroscopy (EDS), X-Ray Diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Scanning Electron Microscope (SEM), and vibrating-sample magnetometer (VSM). Elemental composition was confirmed by EDS.XRD analysis gave information about the crystallinity and two different phases present in the sample. Optical studies were done using FTIR spectroscopy. The sample morphology was explored in SEM images. Magnetic nature confirmed using VSM analysis. Antimicrobial activities of the samples were investigated against bacteria Staphylococcus aureus(S aureus) and Escherichia Coli (E Coli) were swabbed using agarwell diffusion method. The antioxidant properties of the samples were assessed by using DPPH (2, 2-diphenyl-1-picryl-hydrazyl-hydrate) assay, Hydrogen peroxide, hydroxyl, and superoxide free radicals. The synthesized nanoparticles were shown potential activity in scavenging in vitro DPPH assay. The synthesized nanocomposites having reduced size exhibit better scavenging activity and act as good antioxidant compared to others.Transition metal oxides of FeO-MnO magnetic hetero nanostructures were prepared by chemical co-precipitation method using a biological surfactant Deoxyribonucleic Acid (DNA). The characterization of the nanoparticles was performed by Energy-dispersive X-ray spectroscopy (EDS), X-Ray Diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Scanning Electron Microscope (SEM), and vibrating-sample magnetometer (VSM). Elemental composition was confirmed by EDS.XRD analysis gave information about the crystallinity and two different phases present in the sample. Optical studies were done using FTIR spectroscopy. The sample morphology was explored in SEM images. Magnetic nature confirmed using VSM analysis. Antimicrobial activities of the samples were investigated against bacteria Staphylococcus aureus(S aureus) and Escherichia Coli (E Coli) were swabbed using agarwell diffusion method. The antioxidant properties of the samples were assessed by using DPPH (2, 2-diphenyl-1-picryl-hydrazyl-hydrate) assay...","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78702435","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pure Zinc oxide (ZnO) and different concentration of Bi3+ ion doped ZnO nanopowders were synthesized by solution combustion method. Influence of doping on structural and optical properties of nanopowders of ZnO was analyzed using X Ray Diffraction (XRD), Energy Dispersive Spectroscopy (EDS), Photoluminescence (PL) spectroscopy and Raman spectroscopy. The composition of the synthesized samples confirmed using Energy Dispersive Spectroscopy. The average crystalline size of nanopowders is found to be in the nanometer range for pure ZnO and doped ZnO nanopowders. Luminescence emissions were shifted due to the doping and it is confirmed from PL spectra.Pure Zinc oxide (ZnO) and different concentration of Bi3+ ion doped ZnO nanopowders were synthesized by solution combustion method. Influence of doping on structural and optical properties of nanopowders of ZnO was analyzed using X Ray Diffraction (XRD), Energy Dispersive Spectroscopy (EDS), Photoluminescence (PL) spectroscopy and Raman spectroscopy. The composition of the synthesized samples confirmed using Energy Dispersive Spectroscopy. The average crystalline size of nanopowders is found to be in the nanometer range for pure ZnO and doped ZnO nanopowders. Luminescence emissions were shifted due to the doping and it is confirmed from PL spectra.
{"title":"Structural and optical properties of metal ion doped ZnO nanoparticles","authors":"A. Sha, K. Sandhya, Deepthi N. Rajendran","doi":"10.1063/1.5130373","DOIUrl":"https://doi.org/10.1063/1.5130373","url":null,"abstract":"Pure Zinc oxide (ZnO) and different concentration of Bi3+ ion doped ZnO nanopowders were synthesized by solution combustion method. Influence of doping on structural and optical properties of nanopowders of ZnO was analyzed using X Ray Diffraction (XRD), Energy Dispersive Spectroscopy (EDS), Photoluminescence (PL) spectroscopy and Raman spectroscopy. The composition of the synthesized samples confirmed using Energy Dispersive Spectroscopy. The average crystalline size of nanopowders is found to be in the nanometer range for pure ZnO and doped ZnO nanopowders. Luminescence emissions were shifted due to the doping and it is confirmed from PL spectra.Pure Zinc oxide (ZnO) and different concentration of Bi3+ ion doped ZnO nanopowders were synthesized by solution combustion method. Influence of doping on structural and optical properties of nanopowders of ZnO was analyzed using X Ray Diffraction (XRD), Energy Dispersive Spectroscopy (EDS), Photoluminescence (PL) spectroscopy and Raman spectroscopy. The composition of the synthesized samples confirmed using Energy Dispersive Spectroscopy. The average crystalline size of nanopowders is found to be in the nanometer range for pure ZnO and doped ZnO nanopowders. Luminescence emissions were shifted due to the doping and it is confirmed from PL spectra.","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":"40 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85879193","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Bismuth based quaternary oxide glass series 10LiF-40Li2O-20RO-30Bi2O3 where R= Mg, Ca, Sr& Ba have been prepared by the melt quenching method. Physical parameters such as density, glass transition temperature, optical energy gap and refractive index of prepared glasses were evaluated. It was found that, the densities of the glass increased in the order of MgO CaO>SrO>BaO. The decrease in Tg is attributed mainly due to the field strength in the order MgO>CaO>SrO>BaO. The optical band gap (Eopt) values decreased with the replacement of RO oxides in the glass matrix. The values of electronic polarizability, optical basicity and interaction parameters of the glass were determined. The increment of refractive index values in these glasses is attributed to the substitution of alkaline earth oxides of increasing mass. The decrease in optical band gap values and consequently increase in Urbach’s energies confirms the extension of the localized states within the band gap. As a result there shall be an increase in the disorder of the glass network. The variation in optical parameters is owing to the substitution of RO oxides in the present glass network.Bismuth based quaternary oxide glass series 10LiF-40Li2O-20RO-30Bi2O3 where R= Mg, Ca, Sr& Ba have been prepared by the melt quenching method. Physical parameters such as density, glass transition temperature, optical energy gap and refractive index of prepared glasses were evaluated. It was found that, the densities of the glass increased in the order of MgO CaO>SrO>BaO. The decrease in Tg is attributed mainly due to the field strength in the order MgO>CaO>SrO>BaO. The optical band gap (Eopt) values decreased with the replacement of RO oxides in the glass matrix. The values of electronic polarizability, optical basicity and interaction parameters of the glass were determined. The increment of refractive index values in these glasses is attributed to the substitution of alkaline earth oxides of in...
{"title":"Effect of alkaline-earth ions on the physical and optical properties of bismuth based glasses","authors":"C. Srinivasu","doi":"10.1063/1.5130377","DOIUrl":"https://doi.org/10.1063/1.5130377","url":null,"abstract":"Bismuth based quaternary oxide glass series 10LiF-40Li2O-20RO-30Bi2O3 where R= Mg, Ca, Sr& Ba have been prepared by the melt quenching method. Physical parameters such as density, glass transition temperature, optical energy gap and refractive index of prepared glasses were evaluated. It was found that, the densities of the glass increased in the order of MgO CaO>SrO>BaO. The decrease in Tg is attributed mainly due to the field strength in the order MgO>CaO>SrO>BaO. The optical band gap (Eopt) values decreased with the replacement of RO oxides in the glass matrix. The values of electronic polarizability, optical basicity and interaction parameters of the glass were determined. The increment of refractive index values in these glasses is attributed to the substitution of alkaline earth oxides of increasing mass. The decrease in optical band gap values and consequently increase in Urbach’s energies confirms the extension of the localized states within the band gap. As a result there shall be an increase in the disorder of the glass network. The variation in optical parameters is owing to the substitution of RO oxides in the present glass network.Bismuth based quaternary oxide glass series 10LiF-40Li2O-20RO-30Bi2O3 where R= Mg, Ca, Sr& Ba have been prepared by the melt quenching method. Physical parameters such as density, glass transition temperature, optical energy gap and refractive index of prepared glasses were evaluated. It was found that, the densities of the glass increased in the order of MgO CaO>SrO>BaO. The decrease in Tg is attributed mainly due to the field strength in the order MgO>CaO>SrO>BaO. The optical band gap (Eopt) values decreased with the replacement of RO oxides in the glass matrix. The values of electronic polarizability, optical basicity and interaction parameters of the glass were determined. The increment of refractive index values in these glasses is attributed to the substitution of alkaline earth oxides of in...","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74424414","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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