C. Devaraja, G. Gowda, B. Eraiah, K. Keshavamurthy
To investigate the structural consequences of Eu3+ ions on alkali boro tellurite glasses, the set of six glass samples of (70-x) B2O3-15TeO2-10Na2O-5PbO-xEu2O3 with x=0, 0.1, 0.2, 0.3, 0.4 and 0.5 mol% glasses were prepared by conventional melt quenching method and X-ray diffraction characterization of the glasses admits the amorphous structure. Also their structural properties were studied by the help of FTIR and Raman spectra. FTIR measurements revealed that the bond structure of the prepared glasses is based on BO3 and BO4 units sitting in different structural groups and also interlinked by TeO3 and TeO4 groups. By Raman spectra, it is clear that the prepared glass samples possessing the boroxol rings and also found that slight variations in glass network of the system is discussed with the variation of Eu3+ ions.To investigate the structural consequences of Eu3+ ions on alkali boro tellurite glasses, the set of six glass samples of (70-x) B2O3-15TeO2-10Na2O-5PbO-xEu2O3 with x=0, 0.1, 0.2, 0.3, 0.4 and 0.5 mol% glasses were prepared by conventional melt quenching method and X-ray diffraction characterization of the glasses admits the amorphous structure. Also their structural properties were studied by the help of FTIR and Raman spectra. FTIR measurements revealed that the bond structure of the prepared glasses is based on BO3 and BO4 units sitting in different structural groups and also interlinked by TeO3 and TeO4 groups. By Raman spectra, it is clear that the prepared glass samples possessing the boroxol rings and also found that slight variations in glass network of the system is discussed with the variation of Eu3+ ions.
{"title":"FTIR and Raman studies of Eu3+ ions doped alkali boro tellurite glasses","authors":"C. Devaraja, G. Gowda, B. Eraiah, K. Keshavamurthy","doi":"10.1063/1.5113069","DOIUrl":"https://doi.org/10.1063/1.5113069","url":null,"abstract":"To investigate the structural consequences of Eu3+ ions on alkali boro tellurite glasses, the set of six glass samples of (70-x) B2O3-15TeO2-10Na2O-5PbO-xEu2O3 with x=0, 0.1, 0.2, 0.3, 0.4 and 0.5 mol% glasses were prepared by conventional melt quenching method and X-ray diffraction characterization of the glasses admits the amorphous structure. Also their structural properties were studied by the help of FTIR and Raman spectra. FTIR measurements revealed that the bond structure of the prepared glasses is based on BO3 and BO4 units sitting in different structural groups and also interlinked by TeO3 and TeO4 groups. By Raman spectra, it is clear that the prepared glass samples possessing the boroxol rings and also found that slight variations in glass network of the system is discussed with the variation of Eu3+ ions.To investigate the structural consequences of Eu3+ ions on alkali boro tellurite glasses, the set of six glass samples of (70-x) B2O3-15TeO2-10Na2O-5PbO-xEu2O3 with x=0, 0.1, 0.2, 0.3, 0.4 and 0.5 mol% glasses were prepared by conventional melt quenching method and X-ray diffraction characterization of the glasses admits the amorphous structure. Also their structural properties were studied by the help of FTIR and Raman spectra. FTIR measurements revealed that the bond structure of the prepared glasses is based on BO3 and BO4 units sitting in different structural groups and also interlinked by TeO3 and TeO4 groups. By Raman spectra, it is clear that the prepared glass samples possessing the boroxol rings and also found that slight variations in glass network of the system is discussed with the variation of Eu3+ ions.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78957389","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}
Herein, Zn-doped flower plate-like CuO with compositions Cu1-xZnxO (x= 0, 0.05) have been synthesized via hydrothermal method. The thin films of Zn-doped CuO-Reduced graphene oxide (rGO) hybrid materials have been fabricated by drop casting method on glass substrates to study their gas sensing behavior. The structure and morphology of hybrid samples have been examined by X-ray diffraction (XRD) and Field-emission scanning electron microscope (FE-SEM). The sensing performance of Zn-doped flower plate-like CuO (x=0, 0.05)-rGO sensor have been measured for 40 ppm NO2 gas at room temperature and 5% Zn doped hybrid sample exhibit percentage response of ∼66.6 which is almost twice of undoped hybrid sample. Apart from this, sensing performance has been measured for different concentrations of NO2 ranging from 6-125 ppm and also the sensor reproducibility has been checked. In present work, it is suggested that the doping of Zn into rGO based CuO gas sensor could be a promising approach for the development of inexpensive and highly selective room temperature NO2 gas detection.
{"title":"Zn doped flower plate-like CuO-rGO hybrid based room temperature NO2 sensor","authors":"Jyoti, G. D. Varma","doi":"10.1063/1.5113044","DOIUrl":"https://doi.org/10.1063/1.5113044","url":null,"abstract":"Herein, Zn-doped flower plate-like CuO with compositions Cu1-xZnxO (x= 0, 0.05) have been synthesized via hydrothermal method. The thin films of Zn-doped CuO-Reduced graphene oxide (rGO) hybrid materials have been fabricated by drop casting method on glass substrates to study their gas sensing behavior. The structure and morphology of hybrid samples have been examined by X-ray diffraction (XRD) and Field-emission scanning electron microscope (FE-SEM). The sensing performance of Zn-doped flower plate-like CuO (x=0, 0.05)-rGO sensor have been measured for 40 ppm NO2 gas at room temperature and 5% Zn doped hybrid sample exhibit percentage response of ∼66.6 which is almost twice of undoped hybrid sample. Apart from this, sensing performance has been measured for different concentrations of NO2 ranging from 6-125 ppm and also the sensor reproducibility has been checked. In present work, it is suggested that the doping of Zn into rGO based CuO gas sensor could be a promising approach for the development of inexpensive and highly selective room temperature NO2 gas detection.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74979414","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}
P. Rawat, R. Srivastava, G. Dixit, G. Joshi, K. Asokan
Manganese ferrite (MnFe2O4) nanoparticles have been synthesized by polyvinylpyrrolidone assisted autocombustion process. X-ray diffraction study confirmed the crystalline nature and phase purity of manganese ferrite. MnFe2O4 nanoparticles calcined at 1000°C for 2.5 hour has spinel crystal structure with lattice constant 8.4163A. The desired stoichiometric ratio ∼2:1 of Fe:Mn was confirmed by EDAX analysis. An increase in crystallite size was observed in calcined MnFe2O4 nano samples. The dielectric properties of MnFe2O4 were studied at varying frequency range (20kHz - 2MHz) and varying temperature range (100 K - 400 K). The frequency dependence of e′ and tanδ was explained by hopping mechanism of electrons between Fe2+ and Fe3+ on octahedral sites of MnFe2O4. Increase in ac conductivity with increasing temperature was observed for all frequencies due to the increase in thermally activated charge carriers and active grain conductivity in the material.Manganese ferrite (MnFe2O4) nanoparticles have been synthesized by polyvinylpyrrolidone assisted autocombustion process. X-ray diffraction study confirmed the crystalline nature and phase purity of manganese ferrite. MnFe2O4 nanoparticles calcined at 1000°C for 2.5 hour has spinel crystal structure with lattice constant 8.4163A. The desired stoichiometric ratio ∼2:1 of Fe:Mn was confirmed by EDAX analysis. An increase in crystallite size was observed in calcined MnFe2O4 nano samples. The dielectric properties of MnFe2O4 were studied at varying frequency range (20kHz - 2MHz) and varying temperature range (100 K - 400 K). The frequency dependence of e′ and tanδ was explained by hopping mechanism of electrons between Fe2+ and Fe3+ on octahedral sites of MnFe2O4. Increase in ac conductivity with increasing temperature was observed for all frequencies due to the increase in thermally activated charge carriers and active grain conductivity in the material.
{"title":"Facile synthesis and temperature dependent dielectric properties of MnFe2O4 nanoparticles","authors":"P. Rawat, R. Srivastava, G. Dixit, G. Joshi, K. Asokan","doi":"10.1063/1.5112943","DOIUrl":"https://doi.org/10.1063/1.5112943","url":null,"abstract":"Manganese ferrite (MnFe2O4) nanoparticles have been synthesized by polyvinylpyrrolidone assisted autocombustion process. X-ray diffraction study confirmed the crystalline nature and phase purity of manganese ferrite. MnFe2O4 nanoparticles calcined at 1000°C for 2.5 hour has spinel crystal structure with lattice constant 8.4163A. The desired stoichiometric ratio ∼2:1 of Fe:Mn was confirmed by EDAX analysis. An increase in crystallite size was observed in calcined MnFe2O4 nano samples. The dielectric properties of MnFe2O4 were studied at varying frequency range (20kHz - 2MHz) and varying temperature range (100 K - 400 K). The frequency dependence of e′ and tanδ was explained by hopping mechanism of electrons between Fe2+ and Fe3+ on octahedral sites of MnFe2O4. Increase in ac conductivity with increasing temperature was observed for all frequencies due to the increase in thermally activated charge carriers and active grain conductivity in the material.Manganese ferrite (MnFe2O4) nanoparticles have been synthesized by polyvinylpyrrolidone assisted autocombustion process. X-ray diffraction study confirmed the crystalline nature and phase purity of manganese ferrite. MnFe2O4 nanoparticles calcined at 1000°C for 2.5 hour has spinel crystal structure with lattice constant 8.4163A. The desired stoichiometric ratio ∼2:1 of Fe:Mn was confirmed by EDAX analysis. An increase in crystallite size was observed in calcined MnFe2O4 nano samples. The dielectric properties of MnFe2O4 were studied at varying frequency range (20kHz - 2MHz) and varying temperature range (100 K - 400 K). The frequency dependence of e′ and tanδ was explained by hopping mechanism of electrons between Fe2+ and Fe3+ on octahedral sites of MnFe2O4. Increase in ac conductivity with increasing temperature was observed for all frequencies due to the increase in thermally activated charge carriers and active grain conductivity in the material.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77176112","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}
V. Rathore, S. Prakash, Priyanka Gupta, M. Rathore, R. Rawat, R. Choudhary, D. Phase
We have reported on the micro-structural properties of pure and Mn doped SnO2 thin films deposited on Si substrate (011) by pulsed laser deposition. Substrate temperature during deposition was kept at 600° C. Target was prepared by solid-state reaction method and doping concentration was kept 0.5% for Sn1-xMnxO2 thin films. X-ray diffraction characterization showed that the undoped and doped films are crystalline in nature. Atomic Force Microscope (AFM) results shows that Mn (0.5%) doped SnO2 the RMS roughness value is 8.36 nm, average roughness 6.60 nm and grain size is 115 nm. Where in pure SnO2 the RMS roughness value is 9.74 nm, roughness average 7.64 nm and grain size is 120 nm. Pure SnO2 thin films are of high roghness with larger grain size as compared to Mn doped SnO2 films. Parameters particle size, lattice constant and crystalline structure of Sn1-xMnxO2 thin films have found to decrease with the doping concentration.We have reported on the micro-structural properties of pure and Mn doped SnO2 thin films deposited on Si substrate (011) by pulsed laser deposition. Substrate temperature during deposition was kept at 600° C. Target was prepared by solid-state reaction method and doping concentration was kept 0.5% for Sn1-xMnxO2 thin films. X-ray diffraction characterization showed that the undoped and doped films are crystalline in nature. Atomic Force Microscope (AFM) results shows that Mn (0.5%) doped SnO2 the RMS roughness value is 8.36 nm, average roughness 6.60 nm and grain size is 115 nm. Where in pure SnO2 the RMS roughness value is 9.74 nm, roughness average 7.64 nm and grain size is 120 nm. Pure SnO2 thin films are of high roghness with larger grain size as compared to Mn doped SnO2 films. Parameters particle size, lattice constant and crystalline structure of Sn1-xMnxO2 thin films have found to decrease with the doping concentration.
{"title":"Synthesis and characterization of structural properties of Sn1-xMnxO2Thin films prepared by PLD","authors":"V. Rathore, S. Prakash, Priyanka Gupta, M. Rathore, R. Rawat, R. Choudhary, D. Phase","doi":"10.1063/1.5113118","DOIUrl":"https://doi.org/10.1063/1.5113118","url":null,"abstract":"We have reported on the micro-structural properties of pure and Mn doped SnO2 thin films deposited on Si substrate (011) by pulsed laser deposition. Substrate temperature during deposition was kept at 600° C. Target was prepared by solid-state reaction method and doping concentration was kept 0.5% for Sn1-xMnxO2 thin films. X-ray diffraction characterization showed that the undoped and doped films are crystalline in nature. Atomic Force Microscope (AFM) results shows that Mn (0.5%) doped SnO2 the RMS roughness value is 8.36 nm, average roughness 6.60 nm and grain size is 115 nm. Where in pure SnO2 the RMS roughness value is 9.74 nm, roughness average 7.64 nm and grain size is 120 nm. Pure SnO2 thin films are of high roghness with larger grain size as compared to Mn doped SnO2 films. Parameters particle size, lattice constant and crystalline structure of Sn1-xMnxO2 thin films have found to decrease with the doping concentration.We have reported on the micro-structural properties of pure and Mn doped SnO2 thin films deposited on Si substrate (011) by pulsed laser deposition. Substrate temperature during deposition was kept at 600° C. Target was prepared by solid-state reaction method and doping concentration was kept 0.5% for Sn1-xMnxO2 thin films. X-ray diffraction characterization showed that the undoped and doped films are crystalline in nature. Atomic Force Microscope (AFM) results shows that Mn (0.5%) doped SnO2 the RMS roughness value is 8.36 nm, average roughness 6.60 nm and grain size is 115 nm. Where in pure SnO2 the RMS roughness value is 9.74 nm, roughness average 7.64 nm and grain size is 120 nm. Pure SnO2 thin films are of high roghness with larger grain size as compared to Mn doped SnO2 films. Parameters particle size, lattice constant and crystalline structure of Sn1-xMnxO2 thin films have found to decrease with the doping concentration.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81254358","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 comprehensive study of the structural and magnetic properties of Ni1-xCrx (x= 10, 20) nanocrystalline alloys prepared by mechanical milling are reported. From the structural and magnetic properties it is shown that the particles obtained after 30 hour milling are magnetically heterogeneous. High Curie temperature and weak magnetization values observed suggest that particles are in two phase structureor core shell structure.A comprehensive study of the structural and magnetic properties of Ni1-xCrx (x= 10, 20) nanocrystalline alloys prepared by mechanical milling are reported. From the structural and magnetic properties it is shown that the particles obtained after 30 hour milling are magnetically heterogeneous. High Curie temperature and weak magnetization values observed suggest that particles are in two phase structureor core shell structure.
{"title":"Structure and magnetic properties of bimetallic Ni-Cr nanocrystalline powders","authors":"Sonu Vishvakarma, V. Srinivas","doi":"10.1063/1.5113001","DOIUrl":"https://doi.org/10.1063/1.5113001","url":null,"abstract":"A comprehensive study of the structural and magnetic properties of Ni1-xCrx (x= 10, 20) nanocrystalline alloys prepared by mechanical milling are reported. From the structural and magnetic properties it is shown that the particles obtained after 30 hour milling are magnetically heterogeneous. High Curie temperature and weak magnetization values observed suggest that particles are in two phase structureor core shell structure.A comprehensive study of the structural and magnetic properties of Ni1-xCrx (x= 10, 20) nanocrystalline alloys prepared by mechanical milling are reported. From the structural and magnetic properties it is shown that the particles obtained after 30 hour milling are magnetically heterogeneous. High Curie temperature and weak magnetization values observed suggest that particles are in two phase structureor core shell structure.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87638421","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}
Phenyl-conjugated Oligoene dye 2-(Cyano 3-(4-diphenylamino) phenyl) prop 2-enoic acid was synthesized by chemical method. The structure of the synthesized dye was confirmed by 1H NMR and 13C NMR spectrum. From the UV-Visible NIR spectrum the absorption maximum (λmax) was analyzed and from the λmax value the molar extinction coefficient was calculated. From the cyclic-voltammograms the details about the reversibility of electron transfer processes is obtained. Cathodic and anodic redox potentials were used to determine the HOMO-LUMO values. The cyclic voltammetry of the dye was taken using Ag/AgCl as reference electrode, glassy carbon as working electrode and platinum (Pt) as counter electrode with the scan rate 100 mVs-1 and the used temperature is 20°C. The DSSC was made using commercial P25 TiO2 material as photoanode, 2-cyano 3-(4-diphenylaminophenyl) prop 2-enoic acid dye as sensitizer, I-/I3- as electrolyte and Platinum (Pt) used as counter electrode. The solar cell efficiency of the synthesized dye is 1.7 % with Voc=0.67 V, Jsc=4.6 mA/m2 and fill factor (FF) =56 %.Phenyl-conjugated Oligoene dye 2-(Cyano 3-(4-diphenylamino) phenyl) prop 2-enoic acid was synthesized by chemical method. The structure of the synthesized dye was confirmed by 1H NMR and 13C NMR spectrum. From the UV-Visible NIR spectrum the absorption maximum (λmax) was analyzed and from the λmax value the molar extinction coefficient was calculated. From the cyclic-voltammograms the details about the reversibility of electron transfer processes is obtained. Cathodic and anodic redox potentials were used to determine the HOMO-LUMO values. The cyclic voltammetry of the dye was taken using Ag/AgCl as reference electrode, glassy carbon as working electrode and platinum (Pt) as counter electrode with the scan rate 100 mVs-1 and the used temperature is 20°C. The DSSC was made using commercial P25 TiO2 material as photoanode, 2-cyano 3-(4-diphenylaminophenyl) prop 2-enoic acid dye as sensitizer, I-/I3- as electrolyte and Platinum (Pt) used as counter electrode. The solar cell efficiency of the synthesized dye ...
{"title":"Synthesis and characterization of organic 2-(cyano 3-(4-diphenylamino) phenyl) prop 2-enoic acid dye for electrochemical cell applications","authors":"Kotteswaran Shanmugam, M. S. Pandian, P. Ramasamy","doi":"10.1063/1.5113403","DOIUrl":"https://doi.org/10.1063/1.5113403","url":null,"abstract":"Phenyl-conjugated Oligoene dye 2-(Cyano 3-(4-diphenylamino) phenyl) prop 2-enoic acid was synthesized by chemical method. The structure of the synthesized dye was confirmed by 1H NMR and 13C NMR spectrum. From the UV-Visible NIR spectrum the absorption maximum (λmax) was analyzed and from the λmax value the molar extinction coefficient was calculated. From the cyclic-voltammograms the details about the reversibility of electron transfer processes is obtained. Cathodic and anodic redox potentials were used to determine the HOMO-LUMO values. The cyclic voltammetry of the dye was taken using Ag/AgCl as reference electrode, glassy carbon as working electrode and platinum (Pt) as counter electrode with the scan rate 100 mVs-1 and the used temperature is 20°C. The DSSC was made using commercial P25 TiO2 material as photoanode, 2-cyano 3-(4-diphenylaminophenyl) prop 2-enoic acid dye as sensitizer, I-/I3- as electrolyte and Platinum (Pt) used as counter electrode. The solar cell efficiency of the synthesized dye is 1.7 % with Voc=0.67 V, Jsc=4.6 mA/m2 and fill factor (FF) =56 %.Phenyl-conjugated Oligoene dye 2-(Cyano 3-(4-diphenylamino) phenyl) prop 2-enoic acid was synthesized by chemical method. The structure of the synthesized dye was confirmed by 1H NMR and 13C NMR spectrum. From the UV-Visible NIR spectrum the absorption maximum (λmax) was analyzed and from the λmax value the molar extinction coefficient was calculated. From the cyclic-voltammograms the details about the reversibility of electron transfer processes is obtained. Cathodic and anodic redox potentials were used to determine the HOMO-LUMO values. The cyclic voltammetry of the dye was taken using Ag/AgCl as reference electrode, glassy carbon as working electrode and platinum (Pt) as counter electrode with the scan rate 100 mVs-1 and the used temperature is 20°C. The DSSC was made using commercial P25 TiO2 material as photoanode, 2-cyano 3-(4-diphenylaminophenyl) prop 2-enoic acid dye as sensitizer, I-/I3- as electrolyte and Platinum (Pt) used as counter electrode. The solar cell efficiency of the synthesized dye ...","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84636163","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}
The Eu3+ doped phosphate based phosphors NaCdPO4 hosts were prepared by solid-state reaction. The effects of the crystalline host and the incorporation of a sensitizer Eu3+ on the luminescence characteristics of the specimen phosphors were studied. NaCdPO4 was investigated for its structural and luminescence properties, as a possible host material for efficient phosphors. Prepared phosphors were characterized by photoluminescence technique possesses a 320 nm excitation maxima and emission broad peak appears at 637 nm indicating a possible red phosphor for UV excitation operated white LED application.
{"title":"Photoluminescence signature in Eu3+ ion doped NaCdPO4 phosphors for white LEDs application","authors":"M. K. Pradhan, T. L. Rao, S. Dash","doi":"10.1063/1.5113302","DOIUrl":"https://doi.org/10.1063/1.5113302","url":null,"abstract":"The Eu3+ doped phosphate based phosphors NaCdPO4 hosts were prepared by solid-state reaction. The effects of the crystalline host and the incorporation of a sensitizer Eu3+ on the luminescence characteristics of the specimen phosphors were studied. NaCdPO4 was investigated for its structural and luminescence properties, as a possible host material for efficient phosphors. Prepared phosphors were characterized by photoluminescence technique possesses a 320 nm excitation maxima and emission broad peak appears at 637 nm indicating a possible red phosphor for UV excitation operated white LED application.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87396663","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}
Shilpa Singh, Prabal Dev Bhuyan, Sanjeev K. Gupta, Y. Sonvane, P. Gajjar
We have studied electronic and thermoelectric properties of ultrathin arsenic nanowire (As-NW) and antimony nanowire (Sb-NW). We have considered linear and rectangular structure of As and Sb. The negative value of binding energy shows its stability for all the structures. Electronic band structure of linear As-NW and Sb-NW shows formation of Dirac cone above Fermi level and quantum conductance of 2G0. Rectangular As-NW and Sb-NW shows band gap of 0.17eV and 0.78eV, respectively. Linear As-NW shows highest electrical and thermal conductivity with a value of 8.45×1019Ω−1m−1s−1 and 0.58×1015Wm−1K−1s−1 at room temperature, respectively. The rectangular Sb-NW shows least electrical and thermal conductivity. Linear structure of Sb-NW shows highest specific heat among the considered NWs. Figure of merit decreases linearly with increase in temperature for rectangular As-NW and Sb-NW while linear As-NW and SbNW shows parabolic variation with temperature. These ultrathin nanowires could emerge as possible applicant in the field of nanoelectronics and thermoelectric devices.We have studied electronic and thermoelectric properties of ultrathin arsenic nanowire (As-NW) and antimony nanowire (Sb-NW). We have considered linear and rectangular structure of As and Sb. The negative value of binding energy shows its stability for all the structures. Electronic band structure of linear As-NW and Sb-NW shows formation of Dirac cone above Fermi level and quantum conductance of 2G0. Rectangular As-NW and Sb-NW shows band gap of 0.17eV and 0.78eV, respectively. Linear As-NW shows highest electrical and thermal conductivity with a value of 8.45×1019Ω−1m−1s−1 and 0.58×1015Wm−1K−1s−1 at room temperature, respectively. The rectangular Sb-NW shows least electrical and thermal conductivity. Linear structure of Sb-NW shows highest specific heat among the considered NWs. Figure of merit decreases linearly with increase in temperature for rectangular As-NW and Sb-NW while linear As-NW and SbNW shows parabolic variation with temperature. These ultrathin nanowires could emerge as possible applicant...
{"title":"Electronic and temperature dependent transport properties of ultrathin As and Sb nanowires","authors":"Shilpa Singh, Prabal Dev Bhuyan, Sanjeev K. Gupta, Y. Sonvane, P. Gajjar","doi":"10.1063/1.5113286","DOIUrl":"https://doi.org/10.1063/1.5113286","url":null,"abstract":"We have studied electronic and thermoelectric properties of ultrathin arsenic nanowire (As-NW) and antimony nanowire (Sb-NW). We have considered linear and rectangular structure of As and Sb. The negative value of binding energy shows its stability for all the structures. Electronic band structure of linear As-NW and Sb-NW shows formation of Dirac cone above Fermi level and quantum conductance of 2G0. Rectangular As-NW and Sb-NW shows band gap of 0.17eV and 0.78eV, respectively. Linear As-NW shows highest electrical and thermal conductivity with a value of 8.45×1019Ω−1m−1s−1 and 0.58×1015Wm−1K−1s−1 at room temperature, respectively. The rectangular Sb-NW shows least electrical and thermal conductivity. Linear structure of Sb-NW shows highest specific heat among the considered NWs. Figure of merit decreases linearly with increase in temperature for rectangular As-NW and Sb-NW while linear As-NW and SbNW shows parabolic variation with temperature. These ultrathin nanowires could emerge as possible applicant in the field of nanoelectronics and thermoelectric devices.We have studied electronic and thermoelectric properties of ultrathin arsenic nanowire (As-NW) and antimony nanowire (Sb-NW). We have considered linear and rectangular structure of As and Sb. The negative value of binding energy shows its stability for all the structures. Electronic band structure of linear As-NW and Sb-NW shows formation of Dirac cone above Fermi level and quantum conductance of 2G0. Rectangular As-NW and Sb-NW shows band gap of 0.17eV and 0.78eV, respectively. Linear As-NW shows highest electrical and thermal conductivity with a value of 8.45×1019Ω−1m−1s−1 and 0.58×1015Wm−1K−1s−1 at room temperature, respectively. The rectangular Sb-NW shows least electrical and thermal conductivity. Linear structure of Sb-NW shows highest specific heat among the considered NWs. Figure of merit decreases linearly with increase in temperature for rectangular As-NW and Sb-NW while linear As-NW and SbNW shows parabolic variation with temperature. These ultrathin nanowires could emerge as possible applicant...","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"31 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90735437","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}
P. Barman, A. Deka, S. Mondal, Debasree Chowdhury, S. Bhattacharyya
In this work, we report the investigations of the morphology of size-selected Ag-nanocluster (NC) deposited films on untreated Si (100) and Rapid thermal annealed (RTA) Si(100) wafers as a function of substrate temperature. We observe that the mean size of the deposited nanoclusters increases with the increase of substrate temperature when deposited on untreated Si (100) while the mean size of the nanoclusters decreases with the increase of the substrate temperature for RTA Si (100). Here diffusion and aggregation of the deposited Ag-NC are considered as primary factors for the change of the mean size of Ag-NC which is also supported by the height distributions of the Ag-NC, where the average height is almost constant for each set of samples.
{"title":"Thermal diffusion driven Island formation and fragmentation of size-selected Ag-nanocluster films","authors":"P. Barman, A. Deka, S. Mondal, Debasree Chowdhury, S. Bhattacharyya","doi":"10.1063/1.5113145","DOIUrl":"https://doi.org/10.1063/1.5113145","url":null,"abstract":"In this work, we report the investigations of the morphology of size-selected Ag-nanocluster (NC) deposited films on untreated Si (100) and Rapid thermal annealed (RTA) Si(100) wafers as a function of substrate temperature. We observe that the mean size of the deposited nanoclusters increases with the increase of substrate temperature when deposited on untreated Si (100) while the mean size of the nanoclusters decreases with the increase of the substrate temperature for RTA Si (100). Here diffusion and aggregation of the deposited Ag-NC are considered as primary factors for the change of the mean size of Ag-NC which is also supported by the height distributions of the Ag-NC, where the average height is almost constant for each set of samples.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"48 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91246987","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}
D. Samanta, Parita Basnet, T. I. Chanu, S. Chatterjee, S. G. Chatterjee, J. Mukherjee
A comparison on Photo-catalytic activity of pure and Ag-ZnS nanocomposites using histidine as a capping agent have been reported here. The synthesized samples were characterized by X-ray diffraction spectroscopy, Field emission scanning electron microscopy, High resolution transmission electron microscopy and Ultraviolet-Visible spectroscopy. The photocatalytic activity of as-prepared samples were investigated under sunlight using Rhodamine B. The photocatalytic activity of ZnS was observed to be decreased by the incorporation of Ag.A comparison on Photo-catalytic activity of pure and Ag-ZnS nanocomposites using histidine as a capping agent have been reported here. The synthesized samples were characterized by X-ray diffraction spectroscopy, Field emission scanning electron microscopy, High resolution transmission electron microscopy and Ultraviolet-Visible spectroscopy. The photocatalytic activity of as-prepared samples were investigated under sunlight using Rhodamine B. The photocatalytic activity of ZnS was observed to be decreased by the incorporation of Ag.
{"title":"Photo-catalytic activity of green synthesized pure ZnS and Ag-ZnS nanocomposite under sunlight","authors":"D. Samanta, Parita Basnet, T. I. Chanu, S. Chatterjee, S. G. Chatterjee, J. Mukherjee","doi":"10.1063/1.5113042","DOIUrl":"https://doi.org/10.1063/1.5113042","url":null,"abstract":"A comparison on Photo-catalytic activity of pure and Ag-ZnS nanocomposites using histidine as a capping agent have been reported here. The synthesized samples were characterized by X-ray diffraction spectroscopy, Field emission scanning electron microscopy, High resolution transmission electron microscopy and Ultraviolet-Visible spectroscopy. The photocatalytic activity of as-prepared samples were investigated under sunlight using Rhodamine B. The photocatalytic activity of ZnS was observed to be decreased by the incorporation of Ag.A comparison on Photo-catalytic activity of pure and Ag-ZnS nanocomposites using histidine as a capping agent have been reported here. The synthesized samples were characterized by X-ray diffraction spectroscopy, Field emission scanning electron microscopy, High resolution transmission electron microscopy and Ultraviolet-Visible spectroscopy. The photocatalytic activity of as-prepared samples were investigated under sunlight using Rhodamine B. The photocatalytic activity of ZnS was observed to be decreased by the incorporation of Ag.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91337398","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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