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":"149 1","pages":""},"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}
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":"4 1","pages":""},"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}
K. C. Sekhar, G. Rao, B. S. Chary, A. Phani, V. Sathe, N. Narsimlu, M. Shareefuddin
Glasses with xPbX·(30-x)PbO·70B2O3 composition (where X=F2, CI2 and Br2) have been prepared and investigated by Raman spectroscopy with a view to understand the effect of PbO as modifier. The micro Raman spectrum was recorded on Raman spectrometer at room temperature. At high PbO content, Pb enters the glass network as network former, the present investigation deals with modifier role of PbO at low concentration. The measured density values are increasing with increase of PbF2 content which is due to replacement of relatively lower ionic radii of fluorine ions (1.33A) with oxygen ions (1.4A) and decreasing with PbCl2/PbBr2 content which is attributed to replacement of higher ionic radii of chlorine (1.81A)/bromide (1.96A) ions with lower ionic radii of oxygen ions (1.4A). Deconvoluted Raman spectra are used to extract exact band positions. The band positions unveiled that the glass structure is mainly based on trigonal and tetragonal borate units placed in various structural groups. Low concentration of PbO in glass resulted in conversion of boroxol rings into several borate groups, symmetric breathing vibrations of six-member rings with one or two BO3 triangles replaced by BO4- tetrahedral. Raman spectra confirm the presence of Pb ions exists mainly as PbO4 groups.
{"title":"Raman study on lead halo borate glasses: Effect of PbO as modifier","authors":"K. C. Sekhar, G. Rao, B. S. Chary, A. Phani, V. Sathe, N. Narsimlu, M. Shareefuddin","doi":"10.1063/1.5130354","DOIUrl":"https://doi.org/10.1063/1.5130354","url":null,"abstract":"Glasses with xPbX·(30-x)PbO·70B2O3 composition (where X=F2, CI2 and Br2) have been prepared and investigated by Raman spectroscopy with a view to understand the effect of PbO as modifier. The micro Raman spectrum was recorded on Raman spectrometer at room temperature. At high PbO content, Pb enters the glass network as network former, the present investigation deals with modifier role of PbO at low concentration. The measured density values are increasing with increase of PbF2 content which is due to replacement of relatively lower ionic radii of fluorine ions (1.33A) with oxygen ions (1.4A) and decreasing with PbCl2/PbBr2 content which is attributed to replacement of higher ionic radii of chlorine (1.81A)/bromide (1.96A) ions with lower ionic radii of oxygen ions (1.4A). Deconvoluted Raman spectra are used to extract exact band positions. The band positions unveiled that the glass structure is mainly based on trigonal and tetragonal borate units placed in various structural groups. Low concentration of PbO in glass resulted in conversion of boroxol rings into several borate groups, symmetric breathing vibrations of six-member rings with one or two BO3 triangles replaced by BO4- tetrahedral. Raman spectra confirm the presence of Pb ions exists mainly as PbO4 groups.","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":"114 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89297270","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}
Fabrication and characterization of fiber optic hexane sensor using pristine ZnO nanorods have been reported. ZnO nanorods were synthesized by hydrothermal method. The structural, morphological and elemental properties of the nanorods were analyzed using X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectrometer (EDS). The XRD results indicate that the nanorods were crystallized in hexagonal wurzite structure. The SEM analysis shows the rod like shape of the synthesized nanopowders. The fiber optic sensor probe was fabricated via clad modification technology. Further, the probe was subjected to different VOC gases at room temperature. Test VOC gas vapors such as ethanol, methanol and hexane were chosen to investigate the response behaviour of the ZnO nanorods. Noticeably, the sensor showed higher selectivity towards hexane along with the sensitivity of ∼6.5%. The plausible gas sensing mechanism is also discussed in detail. The splendid sensing properties advocate that the ZnO nanorods are promising candidate for hexane sensor.Fabrication and characterization of fiber optic hexane sensor using pristine ZnO nanorods have been reported. ZnO nanorods were synthesized by hydrothermal method. The structural, morphological and elemental properties of the nanorods were analyzed using X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectrometer (EDS). The XRD results indicate that the nanorods were crystallized in hexagonal wurzite structure. The SEM analysis shows the rod like shape of the synthesized nanopowders. The fiber optic sensor probe was fabricated via clad modification technology. Further, the probe was subjected to different VOC gases at room temperature. Test VOC gas vapors such as ethanol, methanol and hexane were chosen to investigate the response behaviour of the ZnO nanorods. Noticeably, the sensor showed higher selectivity towards hexane along with the sensitivity of ∼6.5%. The plausible gas sensing mechanism is also discussed in detail. The splendid sensing properties advocate that the ...
{"title":"ZnO nanorods based fiber optic hexane sensor","authors":"S. Narasimman, L. Balakrishnan, Z. C. Alex","doi":"10.1063/1.5130315","DOIUrl":"https://doi.org/10.1063/1.5130315","url":null,"abstract":"Fabrication and characterization of fiber optic hexane sensor using pristine ZnO nanorods have been reported. ZnO nanorods were synthesized by hydrothermal method. The structural, morphological and elemental properties of the nanorods were analyzed using X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectrometer (EDS). The XRD results indicate that the nanorods were crystallized in hexagonal wurzite structure. The SEM analysis shows the rod like shape of the synthesized nanopowders. The fiber optic sensor probe was fabricated via clad modification technology. Further, the probe was subjected to different VOC gases at room temperature. Test VOC gas vapors such as ethanol, methanol and hexane were chosen to investigate the response behaviour of the ZnO nanorods. Noticeably, the sensor showed higher selectivity towards hexane along with the sensitivity of ∼6.5%. The plausible gas sensing mechanism is also discussed in detail. The splendid sensing properties advocate that the ZnO nanorods are promising candidate for hexane sensor.Fabrication and characterization of fiber optic hexane sensor using pristine ZnO nanorods have been reported. ZnO nanorods were synthesized by hydrothermal method. The structural, morphological and elemental properties of the nanorods were analyzed using X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectrometer (EDS). The XRD results indicate that the nanorods were crystallized in hexagonal wurzite structure. The SEM analysis shows the rod like shape of the synthesized nanopowders. The fiber optic sensor probe was fabricated via clad modification technology. Further, the probe was subjected to different VOC gases at room temperature. Test VOC gas vapors such as ethanol, methanol and hexane were chosen to investigate the response behaviour of the ZnO nanorods. Noticeably, the sensor showed higher selectivity towards hexane along with the sensitivity of ∼6.5%. The plausible gas sensing mechanism is also discussed in detail. The splendid sensing properties advocate that the ...","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":"22 6S 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76524246","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}
Nanotechnology has rapidly advanced over the recent past. Top-down and bottom-up approaches are the two major processes used to synthesize nanoparticles. Most of chemical and physical methods of nanoparticle synthesis are time consuming and costly. Most methods require high temperatures, vacuum conditions or harsh chemicals which may have adverse effects on involved persons. In recent years, researchers have shown immense interest in the environment - friendly green synthesis of nanoparticles. Honey mediated green synthesis is a relatively novel green synthesis method that has been used in recent years to synthesize metal nanoparticles. Honey-mediated green synthesis of nanoparticles is a simple, rapid, cost-effective, biocompatible, reproducible, and safe method. In the present work, we present the sunlight - induced green synthesis of silver nanoparticles using honey from aqueous silver nitrate. We studied the effect of light intensity on the synthesis of silver nanoparticles and also analyzed the growth of the nanoparticles. The particle size is determined from plasmon resonance using Mie theory.Nanotechnology has rapidly advanced over the recent past. Top-down and bottom-up approaches are the two major processes used to synthesize nanoparticles. Most of chemical and physical methods of nanoparticle synthesis are time consuming and costly. Most methods require high temperatures, vacuum conditions or harsh chemicals which may have adverse effects on involved persons. In recent years, researchers have shown immense interest in the environment - friendly green synthesis of nanoparticles. Honey mediated green synthesis is a relatively novel green synthesis method that has been used in recent years to synthesize metal nanoparticles. Honey-mediated green synthesis of nanoparticles is a simple, rapid, cost-effective, biocompatible, reproducible, and safe method. In the present work, we present the sunlight - induced green synthesis of silver nanoparticles using honey from aqueous silver nitrate. We studied the effect of light intensity on the synthesis of silver nanoparticles and also analyzed the growt...
{"title":"Sunlight-induced honey-mediated green synthesis of silver nanoparticles","authors":"G. Madhu, Anuj Kumar, S. K. Nair","doi":"10.1063/1.5130311","DOIUrl":"https://doi.org/10.1063/1.5130311","url":null,"abstract":"Nanotechnology has rapidly advanced over the recent past. Top-down and bottom-up approaches are the two major processes used to synthesize nanoparticles. Most of chemical and physical methods of nanoparticle synthesis are time consuming and costly. Most methods require high temperatures, vacuum conditions or harsh chemicals which may have adverse effects on involved persons. In recent years, researchers have shown immense interest in the environment - friendly green synthesis of nanoparticles. Honey mediated green synthesis is a relatively novel green synthesis method that has been used in recent years to synthesize metal nanoparticles. Honey-mediated green synthesis of nanoparticles is a simple, rapid, cost-effective, biocompatible, reproducible, and safe method. In the present work, we present the sunlight - induced green synthesis of silver nanoparticles using honey from aqueous silver nitrate. We studied the effect of light intensity on the synthesis of silver nanoparticles and also analyzed the growth of the nanoparticles. The particle size is determined from plasmon resonance using Mie theory.Nanotechnology has rapidly advanced over the recent past. Top-down and bottom-up approaches are the two major processes used to synthesize nanoparticles. Most of chemical and physical methods of nanoparticle synthesis are time consuming and costly. Most methods require high temperatures, vacuum conditions or harsh chemicals which may have adverse effects on involved persons. In recent years, researchers have shown immense interest in the environment - friendly green synthesis of nanoparticles. Honey mediated green synthesis is a relatively novel green synthesis method that has been used in recent years to synthesize metal nanoparticles. Honey-mediated green synthesis of nanoparticles is a simple, rapid, cost-effective, biocompatible, reproducible, and safe method. In the present work, we present the sunlight - induced green synthesis of silver nanoparticles using honey from aqueous silver nitrate. We studied the effect of light intensity on the synthesis of silver nanoparticles and also analyzed the growt...","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":"71 4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77477890","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}
Cerium oxide nanoparticles or nanoceria of average crystallite size ∼ 6, 9 and 14 nm were synthesized by chemical co-precipitation method using deoxyribonucleic acid (DNA) as capping agent. Size dependent structural, optical and magnetic properties of prepared samples were investigated by X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), UV-Visible diffuse reflectance spectroscopy and vibrating sample magnetometer (VSM) measurements. The increase in the value of optical band gap with decrease in particle size may be attributed to the quantum confinement effect. The saturation magnetization, coercivity and remanence increases as the particle size decreases from 14 nm to 9 nm. This is in view of the fact that increase in oxygen vacancies may produce magnetic moment by polarizing spins of f electrons of cerium ions located around them. The magnetic properties decreases below a critical size, since thermal energy can overcome the anisotropy and spontaneously reverse the magnetization of a particle from one easy direction to the other. The semiconducting properties along with room temperature ferromagnetism make DNA assisted synthesized nanoceria suitable for fabrication of next generation spintronic devices.Cerium oxide nanoparticles or nanoceria of average crystallite size ∼ 6, 9 and 14 nm were synthesized by chemical co-precipitation method using deoxyribonucleic acid (DNA) as capping agent. Size dependent structural, optical and magnetic properties of prepared samples were investigated by X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), UV-Visible diffuse reflectance spectroscopy and vibrating sample magnetometer (VSM) measurements. The increase in the value of optical band gap with decrease in particle size may be attributed to the quantum confinement effect. The saturation magnetization, coercivity and remanence increases as the particle size decreases from 14 nm to 9 nm. This is in view of the fact that increase in oxygen vacancies may produce magnetic moment by polarizing spins of f electrons of cerium ions located around them. The magnetic properties decreases below a critical size, since thermal energy can overcome the anisotropy and spontaneously reverse the magnet...
{"title":"Investigation on the size dependent optical and magnetic properties of DNA assisted synthesized nanoceria for next generation spintronic devices","authors":"P. Jyothi, B. Anitha, N. Tharayil","doi":"10.1063/1.5130335","DOIUrl":"https://doi.org/10.1063/1.5130335","url":null,"abstract":"Cerium oxide nanoparticles or nanoceria of average crystallite size ∼ 6, 9 and 14 nm were synthesized by chemical co-precipitation method using deoxyribonucleic acid (DNA) as capping agent. Size dependent structural, optical and magnetic properties of prepared samples were investigated by X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), UV-Visible diffuse reflectance spectroscopy and vibrating sample magnetometer (VSM) measurements. The increase in the value of optical band gap with decrease in particle size may be attributed to the quantum confinement effect. The saturation magnetization, coercivity and remanence increases as the particle size decreases from 14 nm to 9 nm. This is in view of the fact that increase in oxygen vacancies may produce magnetic moment by polarizing spins of f electrons of cerium ions located around them. The magnetic properties decreases below a critical size, since thermal energy can overcome the anisotropy and spontaneously reverse the magnetization of a particle from one easy direction to the other. The semiconducting properties along with room temperature ferromagnetism make DNA assisted synthesized nanoceria suitable for fabrication of next generation spintronic devices.Cerium oxide nanoparticles or nanoceria of average crystallite size ∼ 6, 9 and 14 nm were synthesized by chemical co-precipitation method using deoxyribonucleic acid (DNA) as capping agent. Size dependent structural, optical and magnetic properties of prepared samples were investigated by X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), UV-Visible diffuse reflectance spectroscopy and vibrating sample magnetometer (VSM) measurements. The increase in the value of optical band gap with decrease in particle size may be attributed to the quantum confinement effect. The saturation magnetization, coercivity and remanence increases as the particle size decreases from 14 nm to 9 nm. This is in view of the fact that increase in oxygen vacancies may produce magnetic moment by polarizing spins of f electrons of cerium ions located around them. The magnetic properties decreases below a critical size, since thermal energy can overcome the anisotropy and spontaneously reverse the magnet...","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":"136 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75137388","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}
M. Akshay, V. Senan, K. S. V. Surej, B. Akhil, K. V. Shankar, B. Shankar
This research assessed the effect of Ti addition on the microstructure, hardness and tensile strength of as-cast Cu-6Sn alloy which is generally used to manufacture bearings, propellers and impellers. The alloying element was added in concentration of 1 wt% and the samples were cast using permanent die casting. Optical microscope and Energy dispersion spectroscopy (EDS) were used to determine the distribution of the second phase in the alloy. Vickers -hardness tester and Universal testing machine (UTM) were used in this investigation. The results indicate some influence of minor amount of Ti, the mechanical properties (Hardness, UTS, YS and %EL) of as-cast Cu-6Sn alloys were observed to improve with the addition of Ti. The improvement of mechanical properties of Cu-6Sn alloy can be attributed towards the formation of an intermediate phase due to addition of Ti. The research in these works are found to be in accordance with previous literatures.This research assessed the effect of Ti addition on the microstructure, hardness and tensile strength of as-cast Cu-6Sn alloy which is generally used to manufacture bearings, propellers and impellers. The alloying element was added in concentration of 1 wt% and the samples were cast using permanent die casting. Optical microscope and Energy dispersion spectroscopy (EDS) were used to determine the distribution of the second phase in the alloy. Vickers -hardness tester and Universal testing machine (UTM) were used in this investigation. The results indicate some influence of minor amount of Ti, the mechanical properties (Hardness, UTS, YS and %EL) of as-cast Cu-6Sn alloys were observed to improve with the addition of Ti. The improvement of mechanical properties of Cu-6Sn alloy can be attributed towards the formation of an intermediate phase due to addition of Ti. The research in these works are found to be in accordance with previous literatures.
{"title":"Determination on the effect of Ti addition on the mechanical behavior of as-cast Cu-6Sn alloy","authors":"M. Akshay, V. Senan, K. S. V. Surej, B. Akhil, K. V. Shankar, B. Shankar","doi":"10.1063/1.5130228","DOIUrl":"https://doi.org/10.1063/1.5130228","url":null,"abstract":"This research assessed the effect of Ti addition on the microstructure, hardness and tensile strength of as-cast Cu-6Sn alloy which is generally used to manufacture bearings, propellers and impellers. The alloying element was added in concentration of 1 wt% and the samples were cast using permanent die casting. Optical microscope and Energy dispersion spectroscopy (EDS) were used to determine the distribution of the second phase in the alloy. Vickers -hardness tester and Universal testing machine (UTM) were used in this investigation. The results indicate some influence of minor amount of Ti, the mechanical properties (Hardness, UTS, YS and %EL) of as-cast Cu-6Sn alloys were observed to improve with the addition of Ti. The improvement of mechanical properties of Cu-6Sn alloy can be attributed towards the formation of an intermediate phase due to addition of Ti. The research in these works are found to be in accordance with previous literatures.This research assessed the effect of Ti addition on the microstructure, hardness and tensile strength of as-cast Cu-6Sn alloy which is generally used to manufacture bearings, propellers and impellers. The alloying element was added in concentration of 1 wt% and the samples were cast using permanent die casting. Optical microscope and Energy dispersion spectroscopy (EDS) were used to determine the distribution of the second phase in the alloy. Vickers -hardness tester and Universal testing machine (UTM) were used in this investigation. The results indicate some influence of minor amount of Ti, the mechanical properties (Hardness, UTS, YS and %EL) of as-cast Cu-6Sn alloys were observed to improve with the addition of Ti. The improvement of mechanical properties of Cu-6Sn alloy can be attributed towards the formation of an intermediate phase due to addition of Ti. The research in these works are found to be in accordance with previous literatures.","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74581083","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}
Nonlinear optical (NLO) materials have attracted considerable attention with potential applications as optical switching, data storage and optoelectronic devices. Compared with inorganic counterparts, organic complexes owing to its structural flexibility are received growing interest. With this forefront investigations, we herein report synthesis of a set of ruthenium complexes containing Schiff base, ethoxy-methylthiosemicarbazone, and non Schiff base ligands with available metal precursors. The synthesized ligands and the ruthenium complexes were characterized by various analytical and spectrochemical techniques viz., FT-IR, UV-Vis, 1HNMR, 13CNMR and 31PNMR. All the physio-chemical and spectral techniques confirmed that the ruthenium atom is in +2 oxidation state and an octahedral geometry is proposed to all the complexes. The spectral techniques reveals that the ruthenium atom in the complexes coordinated to Schiff base ligand through Oxygen:Nitrogen:Sulphur (ONS) mode. Further, the nonlinear optical property of the compounds was investigated by kurtz-perry powder technique which through a light on the materialistic properties of the ruthenium complexes.Nonlinear optical (NLO) materials have attracted considerable attention with potential applications as optical switching, data storage and optoelectronic devices. Compared with inorganic counterparts, organic complexes owing to its structural flexibility are received growing interest. With this forefront investigations, we herein report synthesis of a set of ruthenium complexes containing Schiff base, ethoxy-methylthiosemicarbazone, and non Schiff base ligands with available metal precursors. The synthesized ligands and the ruthenium complexes were characterized by various analytical and spectrochemical techniques viz., FT-IR, UV-Vis, 1HNMR, 13CNMR and 31PNMR. All the physio-chemical and spectral techniques confirmed that the ruthenium atom is in +2 oxidation state and an octahedral geometry is proposed to all the complexes. The spectral techniques reveals that the ruthenium atom in the complexes coordinated to Schiff base ligand through Oxygen:Nitrogen:Sulphur (ONS) mode. Further, the nonlinear optical p...
{"title":"Synthesis, characterization and NLO property of ruthenium(II) thiosemicarbazone complexes","authors":"K. Sampath, S. Krithika","doi":"10.1063/1.5130328","DOIUrl":"https://doi.org/10.1063/1.5130328","url":null,"abstract":"Nonlinear optical (NLO) materials have attracted considerable attention with potential applications as optical switching, data storage and optoelectronic devices. Compared with inorganic counterparts, organic complexes owing to its structural flexibility are received growing interest. With this forefront investigations, we herein report synthesis of a set of ruthenium complexes containing Schiff base, ethoxy-methylthiosemicarbazone, and non Schiff base ligands with available metal precursors. The synthesized ligands and the ruthenium complexes were characterized by various analytical and spectrochemical techniques viz., FT-IR, UV-Vis, 1HNMR, 13CNMR and 31PNMR. All the physio-chemical and spectral techniques confirmed that the ruthenium atom is in +2 oxidation state and an octahedral geometry is proposed to all the complexes. The spectral techniques reveals that the ruthenium atom in the complexes coordinated to Schiff base ligand through Oxygen:Nitrogen:Sulphur (ONS) mode. Further, the nonlinear optical property of the compounds was investigated by kurtz-perry powder technique which through a light on the materialistic properties of the ruthenium complexes.Nonlinear optical (NLO) materials have attracted considerable attention with potential applications as optical switching, data storage and optoelectronic devices. Compared with inorganic counterparts, organic complexes owing to its structural flexibility are received growing interest. With this forefront investigations, we herein report synthesis of a set of ruthenium complexes containing Schiff base, ethoxy-methylthiosemicarbazone, and non Schiff base ligands with available metal precursors. The synthesized ligands and the ruthenium complexes were characterized by various analytical and spectrochemical techniques viz., FT-IR, UV-Vis, 1HNMR, 13CNMR and 31PNMR. All the physio-chemical and spectral techniques confirmed that the ruthenium atom is in +2 oxidation state and an octahedral geometry is proposed to all the complexes. The spectral techniques reveals that the ruthenium atom in the complexes coordinated to Schiff base ligand through Oxygen:Nitrogen:Sulphur (ONS) mode. Further, the nonlinear optical p...","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":"27 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87206289","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}
Jovia Jose, Sikha K. Simon, Anju Sebastian, Sreedevi P. Chakyar, Joe Kizhakooden, Nees Paul, C. Bindu, K. Umadevi, J. Andrews, V. Joseph
This paper implements Nonstandard Finite Difference Time Domain (NS-FDTD) method to analyses the scattering effect of electromagnetic wave by an artificial plasma cylinder. This NS-FDTD which requires less iteration time for convergence has proved to be around 10,000 times more accurate than the standard FDTD. For a chosen problem, the ratio between wave length and grid space in NS-FDTD need to be only 8 whereas for the standard algorithm it has to be 1140 for the same qualitative result. In this paper, NS-FDTD algorithm which is already successfully implemented for lossless and low loss medium is extended to high loss medium. An artificial negative permittivity metamaterial medium of cylindrical profile is designed using periodic arrangement of thin conducting wires and NS-FDTD is used to study the scattering properties of the plasma structure. For simplicity, interacting field quantities are realized in terms of propagation equation. Converging points of stability function are carefully selected by choosing appropriate value of conductivity. Plane wave of frequency less than the plasma frequency of the artificial plasma cylinder is used for the study. The result obtained is compared with standard FDTD which proves the obvious advantage of using this novel algorithm.
{"title":"Scattering from artificial plasma cylinder using nonstandard FDTD","authors":"Jovia Jose, Sikha K. Simon, Anju Sebastian, Sreedevi P. Chakyar, Joe Kizhakooden, Nees Paul, C. Bindu, K. Umadevi, J. Andrews, V. Joseph","doi":"10.1063/1.5130279","DOIUrl":"https://doi.org/10.1063/1.5130279","url":null,"abstract":"This paper implements Nonstandard Finite Difference Time Domain (NS-FDTD) method to analyses the scattering effect of electromagnetic wave by an artificial plasma cylinder. This NS-FDTD which requires less iteration time for convergence has proved to be around 10,000 times more accurate than the standard FDTD. For a chosen problem, the ratio between wave length and grid space in NS-FDTD need to be only 8 whereas for the standard algorithm it has to be 1140 for the same qualitative result. In this paper, NS-FDTD algorithm which is already successfully implemented for lossless and low loss medium is extended to high loss medium. An artificial negative permittivity metamaterial medium of cylindrical profile is designed using periodic arrangement of thin conducting wires and NS-FDTD is used to study the scattering properties of the plasma structure. For simplicity, interacting field quantities are realized in terms of propagation equation. Converging points of stability function are carefully selected by choosing appropriate value of conductivity. Plane wave of frequency less than the plasma frequency of the artificial plasma cylinder is used for the study. The result obtained is compared with standard FDTD which proves the obvious advantage of using this novel algorithm.","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":"38 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84616883","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}
M. U. Kumar, R. Swetha, M. Murugendrappa, L. Kumari
Nanostructured thermoelectric Skutterudite-based compounds Co2Sb6-xSnx (x= 0.15, 0.2, 0.25, 0.3) with different concentration of Sn were synthesized by hydro-/solvothermal method and annealed at 300° C for 5 hrs in inert atmosphere. Surface morphology analysis shows the formation of square block shaped nanostructures with particle size, 50-70 nm and the chemical analysis confirms the purity of the samples. Structural analysis by powder X-ray diffraction (pXRD) depicts cubic structure of CoSb3 and also confirms the successful occupation of Sn into Sb sites without distorting the crystal structure. The vibration modes corresponding to Co-Sb bonding, cobalt complex and Co-Sn bonding can be observed below 1000 cm−1. Sn filled Co2Sb6 nanostructures show absorption bands in the wavelength range of 260-270 nm.Nanostructured thermoelectric Skutterudite-based compounds Co2Sb6-xSnx (x= 0.15, 0.2, 0.25, 0.3) with different concentration of Sn were synthesized by hydro-/solvothermal method and annealed at 300° C for 5 hrs in inert atmosphere. Surface morphology analysis shows the formation of square block shaped nanostructures with particle size, 50-70 nm and the chemical analysis confirms the purity of the samples. Structural analysis by powder X-ray diffraction (pXRD) depicts cubic structure of CoSb3 and also confirms the successful occupation of Sn into Sb sites without distorting the crystal structure. The vibration modes corresponding to Co-Sb bonding, cobalt complex and Co-Sn bonding can be observed below 1000 cm−1. Sn filled Co2Sb6 nanostructures show absorption bands in the wavelength range of 260-270 nm.
{"title":"Effect of Sn doping at Sb sites on the structural and optical properties of Co2Sb6 nanostructures","authors":"M. U. Kumar, R. Swetha, M. Murugendrappa, L. Kumari","doi":"10.1063/1.5130264","DOIUrl":"https://doi.org/10.1063/1.5130264","url":null,"abstract":"Nanostructured thermoelectric Skutterudite-based compounds Co2Sb6-xSnx (x= 0.15, 0.2, 0.25, 0.3) with different concentration of Sn were synthesized by hydro-/solvothermal method and annealed at 300° C for 5 hrs in inert atmosphere. Surface morphology analysis shows the formation of square block shaped nanostructures with particle size, 50-70 nm and the chemical analysis confirms the purity of the samples. Structural analysis by powder X-ray diffraction (pXRD) depicts cubic structure of CoSb3 and also confirms the successful occupation of Sn into Sb sites without distorting the crystal structure. The vibration modes corresponding to Co-Sb bonding, cobalt complex and Co-Sn bonding can be observed below 1000 cm−1. Sn filled Co2Sb6 nanostructures show absorption bands in the wavelength range of 260-270 nm.Nanostructured thermoelectric Skutterudite-based compounds Co2Sb6-xSnx (x= 0.15, 0.2, 0.25, 0.3) with different concentration of Sn were synthesized by hydro-/solvothermal method and annealed at 300° C for 5 hrs in inert atmosphere. Surface morphology analysis shows the formation of square block shaped nanostructures with particle size, 50-70 nm and the chemical analysis confirms the purity of the samples. Structural analysis by powder X-ray diffraction (pXRD) depicts cubic structure of CoSb3 and also confirms the successful occupation of Sn into Sb sites without distorting the crystal structure. The vibration modes corresponding to Co-Sb bonding, cobalt complex and Co-Sn bonding can be observed below 1000 cm−1. Sn filled Co2Sb6 nanostructures show absorption bands in the wavelength range of 260-270 nm.","PeriodicalId":20725,"journal":{"name":"PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS: ICAM 2019","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82786755","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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