Here we discuss the preparation and characterization of YBa2Cu3O7-δ high temperature superconductor through standard solid state reaction route and added with different (x = 0.0, 0.1, 0.3, 0.5, & 0.7) wt. % of graphene oxide (GO). The phase purity and surface morphology of the composite samples were examined through the X-ray powder diffraction and Field emission scanning electron microscopy respectively. The self field transport measurement and electric field versus current density measurement confirms the occurrence of superconductivity in the composite materials. The maximum value of critical temperature is found to be 96.42 K for 0.7 wt. % GO added sample. Similarly, the maximum value of critical current density is observed to be 412.92 A/cm2 for 0.7 wt. % GO added sample at 77K. This may be attributed to enhancement in superconducting volume fraction of the sample, as GO resides near the grain boundary region to increase the weak link between the superconducting grains.Here we discuss the preparation and characterization of YBa2Cu3O7-δ high temperature superconductor through standard solid state reaction route and added with different (x = 0.0, 0.1, 0.3, 0.5, & 0.7) wt. % of graphene oxide (GO). The phase purity and surface morphology of the composite samples were examined through the X-ray powder diffraction and Field emission scanning electron microscopy respectively. The self field transport measurement and electric field versus current density measurement confirms the occurrence of superconductivity in the composite materials. The maximum value of critical temperature is found to be 96.42 K for 0.7 wt. % GO added sample. Similarly, the maximum value of critical current density is observed to be 412.92 A/cm2 for 0.7 wt. % GO added sample at 77K. This may be attributed to enhancement in superconducting volume fraction of the sample, as GO resides near the grain boundary region to increase the weak link between the superconducting grains.
{"title":"Improvement of critical parameters of YBCO superconductor by addition of graphene oxide","authors":"B. Sahoo, S. Karmakar, D. Behera","doi":"10.1063/1.5130270","DOIUrl":"https://doi.org/10.1063/1.5130270","url":null,"abstract":"Here we discuss the preparation and characterization of YBa2Cu3O7-δ high temperature superconductor through standard solid state reaction route and added with different (x = 0.0, 0.1, 0.3, 0.5, & 0.7) wt. % of graphene oxide (GO). The phase purity and surface morphology of the composite samples were examined through the X-ray powder diffraction and Field emission scanning electron microscopy respectively. The self field transport measurement and electric field versus current density measurement confirms the occurrence of superconductivity in the composite materials. The maximum value of critical temperature is found to be 96.42 K for 0.7 wt. % GO added sample. Similarly, the maximum value of critical current density is observed to be 412.92 A/cm2 for 0.7 wt. % GO added sample at 77K. This may be attributed to enhancement in superconducting volume fraction of the sample, as GO resides near the grain boundary region to increase the weak link between the superconducting grains.Here we discuss the preparation and characterization of YBa2Cu3O7-δ high temperature superconductor through standard solid state reaction route and added with different (x = 0.0, 0.1, 0.3, 0.5, & 0.7) wt. % of graphene oxide (GO). The phase purity and surface morphology of the composite samples were examined through the X-ray powder diffraction and Field emission scanning electron microscopy respectively. The self field transport measurement and electric field versus current density measurement confirms the occurrence of superconductivity in the composite materials. The maximum value of critical temperature is found to be 96.42 K for 0.7 wt. % GO added sample. Similarly, the maximum value of critical current density is observed to be 412.92 A/cm2 for 0.7 wt. % GO added sample at 77K. This may be attributed to enhancement in superconducting volume fraction of the sample, as GO resides near the grain boundary region to increase the weak link between the superconducting grains.","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74005248","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. Tripathy, K. Gautam, K. Dey, A. Ahad, I. Gudim, V. Sathe, D. Shukla
We report on findings in the HoFe3(BO3)4 single crystal across structural phase transition by the dielectric and Raman spectroscopic measurements. In most of the compounds of RFe3(BO3)4 (R=La-Lu) family low temperature P3121 structure is introduced through structural phase transition (from space group R32). Temperature dependent dielectric measurements on the HoFe3(BO3)4 crystal depicts a step like feature at the structural phase transition at ∼366 K. The Raman spectroscopy study also confirms the structural transition around this temperature. A clear signature of structural transition is reflected in the Raman spectra, mainly in the frequency range (200-400 cm-1). Appearance of new Raman modes below the transition temperature also indicates that the transition is from a high symmetry phase to a low symmetry phase.We report on findings in the HoFe3(BO3)4 single crystal across structural phase transition by the dielectric and Raman spectroscopic measurements. In most of the compounds of RFe3(BO3)4 (R=La-Lu) family low temperature P3121 structure is introduced through structural phase transition (from space group R32). Temperature dependent dielectric measurements on the HoFe3(BO3)4 crystal depicts a step like feature at the structural phase transition at ∼366 K. The Raman spectroscopy study also confirms the structural transition around this temperature. A clear signature of structural transition is reflected in the Raman spectra, mainly in the frequency range (200-400 cm-1). Appearance of new Raman modes below the transition temperature also indicates that the transition is from a high symmetry phase to a low symmetry phase.
{"title":"Dielectric and Raman spectroscopy measurements across structural phase transition in multiferroic HoFe3(BO3)4 single crystal","authors":"A. Tripathy, K. Gautam, K. Dey, A. Ahad, I. Gudim, V. Sathe, D. Shukla","doi":"10.1063/1.5130272","DOIUrl":"https://doi.org/10.1063/1.5130272","url":null,"abstract":"We report on findings in the HoFe3(BO3)4 single crystal across structural phase transition by the dielectric and Raman spectroscopic measurements. In most of the compounds of RFe3(BO3)4 (R=La-Lu) family low temperature P3121 structure is introduced through structural phase transition (from space group R32). Temperature dependent dielectric measurements on the HoFe3(BO3)4 crystal depicts a step like feature at the structural phase transition at ∼366 K. The Raman spectroscopy study also confirms the structural transition around this temperature. A clear signature of structural transition is reflected in the Raman spectra, mainly in the frequency range (200-400 cm-1). Appearance of new Raman modes below the transition temperature also indicates that the transition is from a high symmetry phase to a low symmetry phase.We report on findings in the HoFe3(BO3)4 single crystal across structural phase transition by the dielectric and Raman spectroscopic measurements. In most of the compounds of RFe3(BO3)4 (R=La-Lu) family low temperature P3121 structure is introduced through structural phase transition (from space group R32). Temperature dependent dielectric measurements on the HoFe3(BO3)4 crystal depicts a step like feature at the structural phase transition at ∼366 K. The Raman spectroscopy study also confirms the structural transition around this temperature. A clear signature of structural transition is reflected in the Raman spectra, mainly in the frequency range (200-400 cm-1). Appearance of new Raman modes below the transition temperature also indicates that the transition is from a high symmetry phase to a low symmetry phase.","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78189305","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 mixed phase of type-II superconductors, isothermal magnetization curves exhibit an anomalous feature, known as second magnetization peak (SMP). SMP is now widely accepted as an indication of order-disorder transition of vortex lattice. Most of the magnetic phase diagrams of type-II superconductors show SMP curve as temperature independent. In this paper, we have investigated the reason behind the non-monotonic variation of SMP in a low temperature type-II cubic superconductor, Ca3Rh4Sn13 (Tc=8.37 K). The dc magnetization studies of Ca3Rh4Sn13 single crystals were carried out using SQUID-Vibrating sample magnetometer. The non-monotonic variation of SMP anomaly with increase in temperature was observed in samples with high critical current densities. From X-ray diffraction studies and electron probe micro-analysis, it is concluded that the crystals which show non-monotonic variations of SMP in the phase diagrams have slightly higher concentration of point disorders and this causes the increase of critical current density.In the mixed phase of type-II superconductors, isothermal magnetization curves exhibit an anomalous feature, known as second magnetization peak (SMP). SMP is now widely accepted as an indication of order-disorder transition of vortex lattice. Most of the magnetic phase diagrams of type-II superconductors show SMP curve as temperature independent. In this paper, we have investigated the reason behind the non-monotonic variation of SMP in a low temperature type-II cubic superconductor, Ca3Rh4Sn13 (Tc=8.37 K). The dc magnetization studies of Ca3Rh4Sn13 single crystals were carried out using SQUID-Vibrating sample magnetometer. The non-monotonic variation of SMP anomaly with increase in temperature was observed in samples with high critical current densities. From X-ray diffraction studies and electron probe micro-analysis, it is concluded that the crystals which show non-monotonic variations of SMP in the phase diagrams have slightly higher concentration of point disorders and this causes the increase of cri...
{"title":"Study on variation of second magnetization peak curve in a low temperature cubic superconductor, Ca3Rh4Sn13","authors":"M. S. Babu, D. Pal","doi":"10.1063/1.5130337","DOIUrl":"https://doi.org/10.1063/1.5130337","url":null,"abstract":"In the mixed phase of type-II superconductors, isothermal magnetization curves exhibit an anomalous feature, known as second magnetization peak (SMP). SMP is now widely accepted as an indication of order-disorder transition of vortex lattice. Most of the magnetic phase diagrams of type-II superconductors show SMP curve as temperature independent. In this paper, we have investigated the reason behind the non-monotonic variation of SMP in a low temperature type-II cubic superconductor, Ca3Rh4Sn13 (Tc=8.37 K). The dc magnetization studies of Ca3Rh4Sn13 single crystals were carried out using SQUID-Vibrating sample magnetometer. The non-monotonic variation of SMP anomaly with increase in temperature was observed in samples with high critical current densities. From X-ray diffraction studies and electron probe micro-analysis, it is concluded that the crystals which show non-monotonic variations of SMP in the phase diagrams have slightly higher concentration of point disorders and this causes the increase of critical current density.In the mixed phase of type-II superconductors, isothermal magnetization curves exhibit an anomalous feature, known as second magnetization peak (SMP). SMP is now widely accepted as an indication of order-disorder transition of vortex lattice. Most of the magnetic phase diagrams of type-II superconductors show SMP curve as temperature independent. In this paper, we have investigated the reason behind the non-monotonic variation of SMP in a low temperature type-II cubic superconductor, Ca3Rh4Sn13 (Tc=8.37 K). The dc magnetization studies of Ca3Rh4Sn13 single crystals were carried out using SQUID-Vibrating sample magnetometer. The non-monotonic variation of SMP anomaly with increase in temperature was observed in samples with high critical current densities. From X-ray diffraction studies and electron probe micro-analysis, it is concluded that the crystals which show non-monotonic variations of SMP in the phase diagrams have slightly higher concentration of point disorders and this causes the increase of cri...","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79120630","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 this study, we report the synthesis of gold and cerium oxide nanoparticles from the aqueous extract of punica granatum fruit. The synthesized nanoparticles are characterized by analytical techni...
{"title":"Antifungal activities of biogenic Au and CeO2 nanoparticles","authors":"Angel Rose Rajan, A. Rajan, D. Philip, A. John","doi":"10.1063/1.5130220","DOIUrl":"https://doi.org/10.1063/1.5130220","url":null,"abstract":"In this study, we report the synthesis of gold and cerium oxide nanoparticles from the aqueous extract of punica granatum fruit. The synthesized nanoparticles are characterized by analytical techni...","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77658107","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}
Vindhya Hegde, T. S. Nivin, S. Sreeja, S. Gopalan, C. O. Sreekala
Dye sensitized solar cells (DSSCs) have fascinated researchers across the globe since their inception in 1991, due to their easy preparation protocols compared to the conventional silicon solar cells and eco-friendly nature. Most of the time best choice of metal oxide semiconductor is TiO2 because of its high electron injection rate. But on the other hand, wide band gap semiconductor such as ZnO has higher stability and electron mobility. We anticipated that combination of these two should help us to get the better devices. In this study, working electrode modification was done by using hybrid metal oxides as in the fabrication of DSSC to increase the efficiency of the device. ZnO nanoparticles were synthesized by sol-gel process. The morphology, porosity and grain size of the ZnO was studied by SEM analysis. The Particle size was further confirmed by XRD analysis. Bulk and nano TiO2 were blended individually with nano ZnO and their photo voltaic parameters were examined. Used combinations were (i) TiO2-n (ii) TiO2-b (iii) ZnO-n (iv) TiO2-n: TiO2-b in 1:1 ratio (v) ZnO-n: TiO2-n in 1:1 ratio (vi) ZnO-n:TiO2-b in 1:1 ratio respectively along with N719 dye. After assembling the electrodes, the current density-voltage characteristics of each of the combinations were evaluated. It was found that among all the combinations TiO2nano and bulk composition in the proportion 1:1 is showing the optimum efficiency than the other compositions.
{"title":"Photovoltaic studies of hybrid metal oxide semiconductors as photo anode in dye sensitized solar cells","authors":"Vindhya Hegde, T. S. Nivin, S. Sreeja, S. Gopalan, C. O. Sreekala","doi":"10.1063/1.5130339","DOIUrl":"https://doi.org/10.1063/1.5130339","url":null,"abstract":"Dye sensitized solar cells (DSSCs) have fascinated researchers across the globe since their inception in 1991, due to their easy preparation protocols compared to the conventional silicon solar cells and eco-friendly nature. Most of the time best choice of metal oxide semiconductor is TiO2 because of its high electron injection rate. But on the other hand, wide band gap semiconductor such as ZnO has higher stability and electron mobility. We anticipated that combination of these two should help us to get the better devices. In this study, working electrode modification was done by using hybrid metal oxides as in the fabrication of DSSC to increase the efficiency of the device. ZnO nanoparticles were synthesized by sol-gel process. The morphology, porosity and grain size of the ZnO was studied by SEM analysis. The Particle size was further confirmed by XRD analysis. Bulk and nano TiO2 were blended individually with nano ZnO and their photo voltaic parameters were examined. Used combinations were (i) TiO2-n (ii) TiO2-b (iii) ZnO-n (iv) TiO2-n: TiO2-b in 1:1 ratio (v) ZnO-n: TiO2-n in 1:1 ratio (vi) ZnO-n:TiO2-b in 1:1 ratio respectively along with N719 dye. After assembling the electrodes, the current density-voltage characteristics of each of the combinations were evaluated. It was found that among all the combinations TiO2nano and bulk composition in the proportion 1:1 is showing the optimum efficiency than the other compositions.","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89495075","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 this investigation the structural properties and Mossbauer parameters of Ce doped cobalt ferrite nanoparticles are presented. The preparation of the sample is done by nitrate route using sol-gel method and samples are sintered at 300°C for one hour. The XRD pattern shows the pure phases of ferrite in both pure and doped sample of cobalt ferrite. The XRD pattern of cerium doped sample is more scattered then pure sample which indicates that crystallization is weakening when a small amount of cerium is doped. After doping a decrease in particle size is (12nm for pure and 8nm for doped sample) found, this decrease is also verified by the presence of large doublet in Mossbauer spectra. The Mossbauer spectra show two sets of sextets and one doublet in pure as well as in cerium doped sample. Two sextets signify the ferrimagnetic nature of the sample and the doublet is attributed to the presence of superparamagnetic particles in the specimen. A structural formula is calculated by using Mossbauer parameters for both the samples and a substantial effect is found in cationic distribution between A and B sites. Magnetic moment per formula unit is also calculated in this study the values are found for pure and doped samples 4.314 µB and 4.596 µB respectively.In this investigation the structural properties and Mossbauer parameters of Ce doped cobalt ferrite nanoparticles are presented. The preparation of the sample is done by nitrate route using sol-gel method and samples are sintered at 300°C for one hour. The XRD pattern shows the pure phases of ferrite in both pure and doped sample of cobalt ferrite. The XRD pattern of cerium doped sample is more scattered then pure sample which indicates that crystallization is weakening when a small amount of cerium is doped. After doping a decrease in particle size is (12nm for pure and 8nm for doped sample) found, this decrease is also verified by the presence of large doublet in Mossbauer spectra. The Mossbauer spectra show two sets of sextets and one doublet in pure as well as in cerium doped sample. Two sextets signify the ferrimagnetic nature of the sample and the doublet is attributed to the presence of superparamagnetic particles in the specimen. A structural formula is calculated by using Mossbauer parameters for...
{"title":"Effect of cerium doping on the Mössbauer spectroscopic parameters of cobalt ferrite nanoparticles","authors":"G. Chandra, R. Srivastava","doi":"10.1063/1.5130297","DOIUrl":"https://doi.org/10.1063/1.5130297","url":null,"abstract":"In this investigation the structural properties and Mossbauer parameters of Ce doped cobalt ferrite nanoparticles are presented. The preparation of the sample is done by nitrate route using sol-gel method and samples are sintered at 300°C for one hour. The XRD pattern shows the pure phases of ferrite in both pure and doped sample of cobalt ferrite. The XRD pattern of cerium doped sample is more scattered then pure sample which indicates that crystallization is weakening when a small amount of cerium is doped. After doping a decrease in particle size is (12nm for pure and 8nm for doped sample) found, this decrease is also verified by the presence of large doublet in Mossbauer spectra. The Mossbauer spectra show two sets of sextets and one doublet in pure as well as in cerium doped sample. Two sextets signify the ferrimagnetic nature of the sample and the doublet is attributed to the presence of superparamagnetic particles in the specimen. A structural formula is calculated by using Mossbauer parameters for both the samples and a substantial effect is found in cationic distribution between A and B sites. Magnetic moment per formula unit is also calculated in this study the values are found for pure and doped samples 4.314 µB and 4.596 µB respectively.In this investigation the structural properties and Mossbauer parameters of Ce doped cobalt ferrite nanoparticles are presented. The preparation of the sample is done by nitrate route using sol-gel method and samples are sintered at 300°C for one hour. The XRD pattern shows the pure phases of ferrite in both pure and doped sample of cobalt ferrite. The XRD pattern of cerium doped sample is more scattered then pure sample which indicates that crystallization is weakening when a small amount of cerium is doped. After doping a decrease in particle size is (12nm for pure and 8nm for doped sample) found, this decrease is also verified by the presence of large doublet in Mossbauer spectra. The Mossbauer spectra show two sets of sextets and one doublet in pure as well as in cerium doped sample. Two sextets signify the ferrimagnetic nature of the sample and the doublet is attributed to the presence of superparamagnetic particles in the specimen. A structural formula is calculated by using Mossbauer parameters for...","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87398677","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}
Present investigation aims the synthesis, characterizationand dielectric properties of Copper Oxide (CuO) nanoparticles using AnonnaMuricata leaf by means of safe, non-toxic, and eco-friendly green method. The biosynthesized nanoparticles of copper oxide are characterized through XRD, FT-IR, SEM, and UV-Vis spectra. Structure and crystallite size of the product were identified by X-Ray Diffraction analysis (XRD). XRD analysis reveals that prepared nanopowder has crystalline nature with monoclinic structure in the space group of c2/c having crystallite size of 21nm. Peak at 525cm−1 in Fourier Transform Infrared Spectra (FTIR) corresponds to Cu-O stretching which confirm the formation of CuO nanoparticles. UV-Visible spectrum shows a characteristic absorption peak of CuO nanoparticles at wavelength of 355nm. Dielectric measurements have been carried out using sintered pellet in the frequency range 1Hz-10MHz at room temperature. The obtained values of dielectric constant (ℇ’) and loss factor (tan δ) were 41 and 0.0014 respectively at 1MHz. A.C conductivity (σa.c) performance shows electrical conductivity increases with increase in temperature, it make applications for electronic devices.Present investigation aims the synthesis, characterizationand dielectric properties of Copper Oxide (CuO) nanoparticles using AnonnaMuricata leaf by means of safe, non-toxic, and eco-friendly green method. The biosynthesized nanoparticles of copper oxide are characterized through XRD, FT-IR, SEM, and UV-Vis spectra. Structure and crystallite size of the product were identified by X-Ray Diffraction analysis (XRD). XRD analysis reveals that prepared nanopowder has crystalline nature with monoclinic structure in the space group of c2/c having crystallite size of 21nm. Peak at 525cm−1 in Fourier Transform Infrared Spectra (FTIR) corresponds to Cu-O stretching which confirm the formation of CuO nanoparticles. UV-Visible spectrum shows a characteristic absorption peak of CuO nanoparticles at wavelength of 355nm. Dielectric measurements have been carried out using sintered pellet in the frequency range 1Hz-10MHz at room temperature. The obtained values of dielectric constant (ℇ’) and loss factor (tan δ) were 41 ...
{"title":"Dielectric properties of copper oxide nanoparticles using AnnonaMuricata leaf","authors":"P. S. Vindhya, T. Jeyasingh, V. Kavitha","doi":"10.1063/1.5130231","DOIUrl":"https://doi.org/10.1063/1.5130231","url":null,"abstract":"Present investigation aims the synthesis, characterizationand dielectric properties of Copper Oxide (CuO) nanoparticles using AnonnaMuricata leaf by means of safe, non-toxic, and eco-friendly green method. The biosynthesized nanoparticles of copper oxide are characterized through XRD, FT-IR, SEM, and UV-Vis spectra. Structure and crystallite size of the product were identified by X-Ray Diffraction analysis (XRD). XRD analysis reveals that prepared nanopowder has crystalline nature with monoclinic structure in the space group of c2/c having crystallite size of 21nm. Peak at 525cm−1 in Fourier Transform Infrared Spectra (FTIR) corresponds to Cu-O stretching which confirm the formation of CuO nanoparticles. UV-Visible spectrum shows a characteristic absorption peak of CuO nanoparticles at wavelength of 355nm. Dielectric measurements have been carried out using sintered pellet in the frequency range 1Hz-10MHz at room temperature. The obtained values of dielectric constant (ℇ’) and loss factor (tan δ) were 41 and 0.0014 respectively at 1MHz. A.C conductivity (σa.c) performance shows electrical conductivity increases with increase in temperature, it make applications for electronic devices.Present investigation aims the synthesis, characterizationand dielectric properties of Copper Oxide (CuO) nanoparticles using AnonnaMuricata leaf by means of safe, non-toxic, and eco-friendly green method. The biosynthesized nanoparticles of copper oxide are characterized through XRD, FT-IR, SEM, and UV-Vis spectra. Structure and crystallite size of the product were identified by X-Ray Diffraction analysis (XRD). XRD analysis reveals that prepared nanopowder has crystalline nature with monoclinic structure in the space group of c2/c having crystallite size of 21nm. Peak at 525cm−1 in Fourier Transform Infrared Spectra (FTIR) corresponds to Cu-O stretching which confirm the formation of CuO nanoparticles. UV-Visible spectrum shows a characteristic absorption peak of CuO nanoparticles at wavelength of 355nm. Dielectric measurements have been carried out using sintered pellet in the frequency range 1Hz-10MHz at room temperature. The obtained values of dielectric constant (ℇ’) and loss factor (tan δ) were 41 ...","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86929416","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}
Tin disulfide (SnS2) is one of the promising two-dimensional (2D) layered metal dichalcogenide with excellent optical and electrical properties. Due to its excellent electrical performance and low temperature processibility, SnS2 turns out to be a promising channel material for thin film transistors. This work mainly focuses on deposition and characterisation of tin disulfide SnS2 thin films by thermal evaporation of metallic tin followed by sulphurization process. The synthesis incorporated thermal evaporation of precursor tin (Sn) followed by post deposition annealing of tin (Sn) films in the presence of sulphur powder with N2 as the carrier gas. The post sulphur annealing at various temperatures were done to sulphurise the metallic Sn thin films and to improve the phase purity. The high-quality SnS2 films formed by sulphur annealing were analyzed by various techniques. XRD data and Raman spectrum revealed the structural information and vibrational modes of SnS2 films. Optical absorption studies showed a band gap of 2.2 eV, in well agreement with the reported values of SnS2 thin films. The conditions for the sulphur annealing process of thermally evaporated Sn films were optimized and examined the possibility of forming a SnS2 2D material at low temperature with large area uniformity.Tin disulfide (SnS2) is one of the promising two-dimensional (2D) layered metal dichalcogenide with excellent optical and electrical properties. Due to its excellent electrical performance and low temperature processibility, SnS2 turns out to be a promising channel material for thin film transistors. This work mainly focuses on deposition and characterisation of tin disulfide SnS2 thin films by thermal evaporation of metallic tin followed by sulphurization process. The synthesis incorporated thermal evaporation of precursor tin (Sn) followed by post deposition annealing of tin (Sn) films in the presence of sulphur powder with N2 as the carrier gas. The post sulphur annealing at various temperatures were done to sulphurise the metallic Sn thin films and to improve the phase purity. The high-quality SnS2 films formed by sulphur annealing were analyzed by various techniques. XRD data and Raman spectrum revealed the structural information and vibrational modes of SnS2 films. Optical absorption studies showed ...
{"title":"Deposition of tin disulfide thin films by thermal evaporation and sulphurization","authors":"K. Lazar, V. Rigi, P. Hajara, P. Praveen, K. Saji","doi":"10.1063/1.5130288","DOIUrl":"https://doi.org/10.1063/1.5130288","url":null,"abstract":"Tin disulfide (SnS2) is one of the promising two-dimensional (2D) layered metal dichalcogenide with excellent optical and electrical properties. Due to its excellent electrical performance and low temperature processibility, SnS2 turns out to be a promising channel material for thin film transistors. This work mainly focuses on deposition and characterisation of tin disulfide SnS2 thin films by thermal evaporation of metallic tin followed by sulphurization process. The synthesis incorporated thermal evaporation of precursor tin (Sn) followed by post deposition annealing of tin (Sn) films in the presence of sulphur powder with N2 as the carrier gas. The post sulphur annealing at various temperatures were done to sulphurise the metallic Sn thin films and to improve the phase purity. The high-quality SnS2 films formed by sulphur annealing were analyzed by various techniques. XRD data and Raman spectrum revealed the structural information and vibrational modes of SnS2 films. Optical absorption studies showed a band gap of 2.2 eV, in well agreement with the reported values of SnS2 thin films. The conditions for the sulphur annealing process of thermally evaporated Sn films were optimized and examined the possibility of forming a SnS2 2D material at low temperature with large area uniformity.Tin disulfide (SnS2) is one of the promising two-dimensional (2D) layered metal dichalcogenide with excellent optical and electrical properties. Due to its excellent electrical performance and low temperature processibility, SnS2 turns out to be a promising channel material for thin film transistors. This work mainly focuses on deposition and characterisation of tin disulfide SnS2 thin films by thermal evaporation of metallic tin followed by sulphurization process. The synthesis incorporated thermal evaporation of precursor tin (Sn) followed by post deposition annealing of tin (Sn) films in the presence of sulphur powder with N2 as the carrier gas. The post sulphur annealing at various temperatures were done to sulphurise the metallic Sn thin films and to improve the phase purity. The high-quality SnS2 films formed by sulphur annealing were analyzed by various techniques. XRD data and Raman spectrum revealed the structural information and vibrational modes of SnS2 films. Optical absorption studies showed ...","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84568680","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}
Silicon germanium nanowire has varieties of applications in nanoelectronics and optoelectronics due to technological advances. Nowadays, Computational Material Science is evolving because computer simulation is a tool to get insight about the properties of materials at atomic or molecular level which is used to predict and/or verify experiments. This is considered as a bridge between theory and experiment. In this paper, silicon germanium square nanowire having simulation length of 97.74 A° is simulated by Nonequilibrium molecular dynamics simulation. Empirical interatomic potential used is Stillinger Weber potential. For canonical ensemble, effect of temperatures on thermal conductivity of silicon germanium square nanowire is studied.Silicon germanium nanowire has varieties of applications in nanoelectronics and optoelectronics due to technological advances. Nowadays, Computational Material Science is evolving because computer simulation is a tool to get insight about the properties of materials at atomic or molecular level which is used to predict and/or verify experiments. This is considered as a bridge between theory and experiment. In this paper, silicon germanium square nanowire having simulation length of 97.74 A° is simulated by Nonequilibrium molecular dynamics simulation. Empirical interatomic potential used is Stillinger Weber potential. For canonical ensemble, effect of temperatures on thermal conductivity of silicon germanium square nanowire is studied.
{"title":"Effect of temperature on thermal conductivity of silicon germanium square nanowire using nonequilibrium molecular dynamics simulation","authors":"Priyanka P. Jadhav, T. Dongale, R. Vhatkar","doi":"10.1063/1.5130248","DOIUrl":"https://doi.org/10.1063/1.5130248","url":null,"abstract":"Silicon germanium nanowire has varieties of applications in nanoelectronics and optoelectronics due to technological advances. Nowadays, Computational Material Science is evolving because computer simulation is a tool to get insight about the properties of materials at atomic or molecular level which is used to predict and/or verify experiments. This is considered as a bridge between theory and experiment. In this paper, silicon germanium square nanowire having simulation length of 97.74 A° is simulated by Nonequilibrium molecular dynamics simulation. Empirical interatomic potential used is Stillinger Weber potential. For canonical ensemble, effect of temperatures on thermal conductivity of silicon germanium square nanowire is studied.Silicon germanium nanowire has varieties of applications in nanoelectronics and optoelectronics due to technological advances. Nowadays, Computational Material Science is evolving because computer simulation is a tool to get insight about the properties of materials at atomic or molecular level which is used to predict and/or verify experiments. This is considered as a bridge between theory and experiment. In this paper, silicon germanium square nanowire having simulation length of 97.74 A° is simulated by Nonequilibrium molecular dynamics simulation. Empirical interatomic potential used is Stillinger Weber potential. For canonical ensemble, effect of temperatures on thermal conductivity of silicon germanium square nanowire is studied.","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88193182","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}
Zeolite cerium oxide (ZEC) nanocomposite was prepared by co-precipitation method and was characterized by X-ray diffraction (XRD) and Fourier transforms infrareds Spectroscopy (FTIR). The XRD analysis confirmed the formation of nanocomposite of fluorite structured CeO2 having diameter 25 nm embedded in zeolite matrix. The FTIR spectrum of composite showed metal-oxygen bonds near 400 cm−1. ZEC composite was used as photo-catalyst for the degradation of Malachite Green dye (MG) under sun light. The influence of parameters like initial dye concentration, catalyst dose, pH and time on degradation of dye was monitored. 100% photo degradation efficiency was obtained using MG solution of concentration 60 ppm, 100 mg of ZEC catalyst at pH 10.0 in a time period of 15minutes. The mechanism of dye degradation was found to follow pseudo first order kinetics. The antibacterial activity of ZEC was tested against Bacillus subtilis (B29) and Escherichia coli (E266) bacteria using disc diffusion method. After 24 hrs of bacterial growth, the ZEC composite showed excellent antibacterial activity with inhibition zones of 21 mm and 23 mm against Bacillus subtilis and Escherichia coli respectively.Zeolite cerium oxide (ZEC) nanocomposite was prepared by co-precipitation method and was characterized by X-ray diffraction (XRD) and Fourier transforms infrareds Spectroscopy (FTIR). The XRD analysis confirmed the formation of nanocomposite of fluorite structured CeO2 having diameter 25 nm embedded in zeolite matrix. The FTIR spectrum of composite showed metal-oxygen bonds near 400 cm−1. ZEC composite was used as photo-catalyst for the degradation of Malachite Green dye (MG) under sun light. The influence of parameters like initial dye concentration, catalyst dose, pH and time on degradation of dye was monitored. 100% photo degradation efficiency was obtained using MG solution of concentration 60 ppm, 100 mg of ZEC catalyst at pH 10.0 in a time period of 15minutes. The mechanism of dye degradation was found to follow pseudo first order kinetics. The antibacterial activity of ZEC was tested against Bacillus subtilis (B29) and Escherichia coli (E266) bacteria using disc diffusion method. After 24 hrs of ba...
{"title":"Photodegradation and antibacterial properties of zeolite cerium oxide nanocomposite","authors":"K. Rakesh, M. Vyshnavi, R. Antony","doi":"10.1063/1.5130374","DOIUrl":"https://doi.org/10.1063/1.5130374","url":null,"abstract":"Zeolite cerium oxide (ZEC) nanocomposite was prepared by co-precipitation method and was characterized by X-ray diffraction (XRD) and Fourier transforms infrareds Spectroscopy (FTIR). The XRD analysis confirmed the formation of nanocomposite of fluorite structured CeO2 having diameter 25 nm embedded in zeolite matrix. The FTIR spectrum of composite showed metal-oxygen bonds near 400 cm−1. ZEC composite was used as photo-catalyst for the degradation of Malachite Green dye (MG) under sun light. The influence of parameters like initial dye concentration, catalyst dose, pH and time on degradation of dye was monitored. 100% photo degradation efficiency was obtained using MG solution of concentration 60 ppm, 100 mg of ZEC catalyst at pH 10.0 in a time period of 15minutes. The mechanism of dye degradation was found to follow pseudo first order kinetics. The antibacterial activity of ZEC was tested against Bacillus subtilis (B29) and Escherichia coli (E266) bacteria using disc diffusion method. After 24 hrs of bacterial growth, the ZEC composite showed excellent antibacterial activity with inhibition zones of 21 mm and 23 mm against Bacillus subtilis and Escherichia coli respectively.Zeolite cerium oxide (ZEC) nanocomposite was prepared by co-precipitation method and was characterized by X-ray diffraction (XRD) and Fourier transforms infrareds Spectroscopy (FTIR). The XRD analysis confirmed the formation of nanocomposite of fluorite structured CeO2 having diameter 25 nm embedded in zeolite matrix. The FTIR spectrum of composite showed metal-oxygen bonds near 400 cm−1. ZEC composite was used as photo-catalyst for the degradation of Malachite Green dye (MG) under sun light. The influence of parameters like initial dye concentration, catalyst dose, pH and time on degradation of dye was monitored. 100% photo degradation efficiency was obtained using MG solution of concentration 60 ppm, 100 mg of ZEC catalyst at pH 10.0 in a time period of 15minutes. The mechanism of dye degradation was found to follow pseudo first order kinetics. The antibacterial activity of ZEC was tested against Bacillus subtilis (B29) and Escherichia coli (E266) bacteria using disc diffusion method. After 24 hrs of ba...","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88238575","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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