A. Maikap, K. Mukherjee, B. Mondal, N. Mandal, A. Meikap
Present article describes the development of novel electrode for the electrochemical detection of fluoride ion (F-) present in water. The electrode is prepared by growing thin ferric hydroxide thin film on conducting glass substrate through simple and cost effective spin coating technique with 150°C calcined temperature. Electrochemical sensing performances of the developed electrode through cyclic voltammetric and amperometric technique are studied within a three electrode chamber where Ag/AgCl and Pt are used as reference and counter electrodes respectively. The developed iron oxide based working electrode shows distinguishable cyclic voltammetric and amperometric response in presence of different concentration (0.27 to 2.48 mM) of aqueous fluoride solution. Morphology and phase of the electrode material is studied prior the electrochemical sensing to understand the behavior of electrochemical interaction. Based on the observations, a plausible mechanism is also proposed for the electrochemical sensing of fluoride by iron oxide thin film.Present article describes the development of novel electrode for the electrochemical detection of fluoride ion (F-) present in water. The electrode is prepared by growing thin ferric hydroxide thin film on conducting glass substrate through simple and cost effective spin coating technique with 150°C calcined temperature. Electrochemical sensing performances of the developed electrode through cyclic voltammetric and amperometric technique are studied within a three electrode chamber where Ag/AgCl and Pt are used as reference and counter electrodes respectively. The developed iron oxide based working electrode shows distinguishable cyclic voltammetric and amperometric response in presence of different concentration (0.27 to 2.48 mM) of aqueous fluoride solution. Morphology and phase of the electrode material is studied prior the electrochemical sensing to understand the behavior of electrochemical interaction. Based on the observations, a plausible mechanism is also proposed for the electrochemical sensing ...
{"title":"Ferric hydroxide thin film based novel electrode for electrochemical detection of fluoride ion (F−) present in water in trace level","authors":"A. Maikap, K. Mukherjee, B. Mondal, N. Mandal, A. Meikap","doi":"10.1063/1.5113153","DOIUrl":"https://doi.org/10.1063/1.5113153","url":null,"abstract":"Present article describes the development of novel electrode for the electrochemical detection of fluoride ion (F-) present in water. The electrode is prepared by growing thin ferric hydroxide thin film on conducting glass substrate through simple and cost effective spin coating technique with 150°C calcined temperature. Electrochemical sensing performances of the developed electrode through cyclic voltammetric and amperometric technique are studied within a three electrode chamber where Ag/AgCl and Pt are used as reference and counter electrodes respectively. The developed iron oxide based working electrode shows distinguishable cyclic voltammetric and amperometric response in presence of different concentration (0.27 to 2.48 mM) of aqueous fluoride solution. Morphology and phase of the electrode material is studied prior the electrochemical sensing to understand the behavior of electrochemical interaction. Based on the observations, a plausible mechanism is also proposed for the electrochemical sensing of fluoride by iron oxide thin film.Present article describes the development of novel electrode for the electrochemical detection of fluoride ion (F-) present in water. The electrode is prepared by growing thin ferric hydroxide thin film on conducting glass substrate through simple and cost effective spin coating technique with 150°C calcined temperature. Electrochemical sensing performances of the developed electrode through cyclic voltammetric and amperometric technique are studied within a three electrode chamber where Ag/AgCl and Pt are used as reference and counter electrodes respectively. The developed iron oxide based working electrode shows distinguishable cyclic voltammetric and amperometric response in presence of different concentration (0.27 to 2.48 mM) of aqueous fluoride solution. Morphology and phase of the electrode material is studied prior the electrochemical sensing to understand the behavior of electrochemical interaction. Based on the observations, a plausible mechanism is also proposed for the electrochemical sensing ...","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78702615","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 simple in-plane electrical measurements of tellurium (Te) thin films, of thicknesses 8,10, 15 and 20 nm on SiO2/Si substrates, revealed strong switching characteristics at voltages less than 2V. The films exhibited clear read-write-erase (rewritable) bipolar memory behavior. The maximum ON/OFF ratio of about 104 to 105 was obtained for 10 and 15 nm thick films. Surface morphology of the thin films, investigated using scanning electron microscopy (SEM), revealed hexagonal structures with grain boundaries. These grain boundaries were suggested to be causing charge carrier trapping in Te films and hence the switching characteristics. Stable cyclic switching and good retention characteristics were demonstrated.The simple in-plane electrical measurements of tellurium (Te) thin films, of thicknesses 8,10, 15 and 20 nm on SiO2/Si substrates, revealed strong switching characteristics at voltages less than 2V. The films exhibited clear read-write-erase (rewritable) bipolar memory behavior. The maximum ON/OFF ratio of about 104 to 105 was obtained for 10 and 15 nm thick films. Surface morphology of the thin films, investigated using scanning electron microscopy (SEM), revealed hexagonal structures with grain boundaries. These grain boundaries were suggested to be causing charge carrier trapping in Te films and hence the switching characteristics. Stable cyclic switching and good retention characteristics were demonstrated.
{"title":"Low operating voltage bistable memory characteristics of tellurium thin films","authors":"R. Yadav, N. Padma, S. Sen, A. Arvind, R. Rao","doi":"10.1063/1.5113134","DOIUrl":"https://doi.org/10.1063/1.5113134","url":null,"abstract":"The simple in-plane electrical measurements of tellurium (Te) thin films, of thicknesses 8,10, 15 and 20 nm on SiO2/Si substrates, revealed strong switching characteristics at voltages less than 2V. The films exhibited clear read-write-erase (rewritable) bipolar memory behavior. The maximum ON/OFF ratio of about 104 to 105 was obtained for 10 and 15 nm thick films. Surface morphology of the thin films, investigated using scanning electron microscopy (SEM), revealed hexagonal structures with grain boundaries. These grain boundaries were suggested to be causing charge carrier trapping in Te films and hence the switching characteristics. Stable cyclic switching and good retention characteristics were demonstrated.The simple in-plane electrical measurements of tellurium (Te) thin films, of thicknesses 8,10, 15 and 20 nm on SiO2/Si substrates, revealed strong switching characteristics at voltages less than 2V. The films exhibited clear read-write-erase (rewritable) bipolar memory behavior. The maximum ON/OFF ratio of about 104 to 105 was obtained for 10 and 15 nm thick films. Surface morphology of the thin films, investigated using scanning electron microscopy (SEM), revealed hexagonal structures with grain boundaries. These grain boundaries were suggested to be causing charge carrier trapping in Te films and hence the switching characteristics. Stable cyclic switching and good retention characteristics were demonstrated.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"59 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78865438","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}
N. Kavitha, N. Palani, K. S. Venkatesh, R. Ilangovan
The ternary transition metal oxide NiCo2O4 and graphene nanocomposite were synthesized by using fast and simple microwave irradiation method for energy storage application. The synthesized graphene-NiCo2O4 nanocomposite structure were characterized using X-ray diffraction(XRD), Raman spectroscopy and the uniform distribution of the NiCo2O4 nanoparticle on graphene oxide were employed by Scanning Electron Microscopy (SEM). In the present study, microwave energy plays a important role in the synthesis of nanoporous NiCo2O4 nanoparticles uniformly distributed on the graphene layer and also the graphene layers restacking was reduced. The synthesized graphene NiCo2O4 nanocomposite exhibit 1369 F g−1 for the current density of 1 A g−1. In addition, the capacity retention of 96.8 % was maintained after 1000 cycles, as suggested that graphene-NiCo2O4 nanocomposite is a promising electrode material for supercapacitors.The ternary transition metal oxide NiCo2O4 and graphene nanocomposite were synthesized by using fast and simple microwave irradiation method for energy storage application. The synthesized graphene-NiCo2O4 nanocomposite structure were characterized using X-ray diffraction(XRD), Raman spectroscopy and the uniform distribution of the NiCo2O4 nanoparticle on graphene oxide were employed by Scanning Electron Microscopy (SEM). In the present study, microwave energy plays a important role in the synthesis of nanoporous NiCo2O4 nanoparticles uniformly distributed on the graphene layer and also the graphene layers restacking was reduced. The synthesized graphene NiCo2O4 nanocomposite exhibit 1369 F g−1 for the current density of 1 A g−1. In addition, the capacity retention of 96.8 % was maintained after 1000 cycles, as suggested that graphene-NiCo2O4 nanocomposite is a promising electrode material for supercapacitors.
采用快速、简便的微波辐照方法合成了过渡金属氧化物NiCo2O4和石墨烯纳米复合材料。利用x射线衍射(XRD)、拉曼光谱(Raman)对合成的石墨烯-NiCo2O4纳米复合材料结构进行了表征，并利用扫描电镜(SEM)对NiCo2O4纳米颗粒在氧化石墨烯上的均匀分布进行了表征。在本研究中，微波能量在纳米多孔NiCo2O4纳米颗粒的合成中发挥了重要作用，均匀地分布在石墨烯层上，并减少了石墨烯层的堆积。合成的NiCo2O4石墨烯纳米复合材料在电流密度为1 A g−1时表现为1369 F g−1。此外，经过1000次循环后，石墨烯- nico2o4纳米复合材料的容量保持率保持在96.8%，这表明石墨烯- nico2o4纳米复合材料是一种有前途的超级电容器电极材料。采用快速、简便的微波辐照方法合成了过渡金属氧化物NiCo2O4和石墨烯纳米复合材料。利用x射线衍射(XRD)、拉曼光谱(Raman)对合成的石墨烯-NiCo2O4纳米复合材料结构进行了表征，并利用扫描电镜(SEM)对NiCo2O4纳米颗粒在氧化石墨烯上的均匀分布进行了表征。在本研究中，微波能量在纳米多孔NiCo2O4纳米颗粒的合成中发挥了重要作用，均匀地分布在石墨烯层上，并减少了石墨烯层的堆积。合成的NiCo2O4石墨烯纳米复合材料在电流密度为1 A g−1时表现为1369 F g−1。此外，经过1000次循环后，石墨烯- nico2o4纳米复合材料的容量保持率保持在96.8%，这表明石墨烯- nico2o4纳米复合材料是一种有前途的超级电容器电极材料。
{"title":"Microwave-assisted rapid synthesis of graphene nanosheet/NiCo2O4 nanocomposite for high-performance supercapacitor applications","authors":"N. Kavitha, N. Palani, K. S. Venkatesh, R. Ilangovan","doi":"10.1063/1.5113421","DOIUrl":"https://doi.org/10.1063/1.5113421","url":null,"abstract":"The ternary transition metal oxide NiCo2O4 and graphene nanocomposite were synthesized by using fast and simple microwave irradiation method for energy storage application. The synthesized graphene-NiCo2O4 nanocomposite structure were characterized using X-ray diffraction(XRD), Raman spectroscopy and the uniform distribution of the NiCo2O4 nanoparticle on graphene oxide were employed by Scanning Electron Microscopy (SEM). In the present study, microwave energy plays a important role in the synthesis of nanoporous NiCo2O4 nanoparticles uniformly distributed on the graphene layer and also the graphene layers restacking was reduced. The synthesized graphene NiCo2O4 nanocomposite exhibit 1369 F g−1 for the current density of 1 A g−1. In addition, the capacity retention of 96.8 % was maintained after 1000 cycles, as suggested that graphene-NiCo2O4 nanocomposite is a promising electrode material for supercapacitors.The ternary transition metal oxide NiCo2O4 and graphene nanocomposite were synthesized by using fast and simple microwave irradiation method for energy storage application. The synthesized graphene-NiCo2O4 nanocomposite structure were characterized using X-ray diffraction(XRD), Raman spectroscopy and the uniform distribution of the NiCo2O4 nanoparticle on graphene oxide were employed by Scanning Electron Microscopy (SEM). In the present study, microwave energy plays a important role in the synthesis of nanoporous NiCo2O4 nanoparticles uniformly distributed on the graphene layer and also the graphene layers restacking was reduced. The synthesized graphene NiCo2O4 nanocomposite exhibit 1369 F g−1 for the current density of 1 A g−1. In addition, the capacity retention of 96.8 % was maintained after 1000 cycles, as suggested that graphene-NiCo2O4 nanocomposite is a promising electrode material for supercapacitors.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88155530","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 composites of BaFe12O19 and BaTiO3 having composition xBaTiO3 - (1-x)BaFe12O19 (x=0.10 and 0.20) were prepared by commercial solid state reaction method. The Rietveld refinement revealed the hexagonal phase with space group P63/mmc for BaFe12O19 and tetragonal phase with space group P4mm for BaTiO3. No appreciable phase changes take place in samples. The dielectric response of dielectric constant (e′) and dielectric loss (tanδ) in the low frequency region was analyzed in the light of Maxwell Wagner model. Further impedance studies help to study the microstructure of the material and also show the grain and grain boundary contribution in the prepared samples.
{"title":"Investigation of crystal structure and dielectric response in BaTiO3-BaFe12O19 multiferroic composites","authors":"A. Kumari, S. Sanghi, E. Arya, Meenal, Vibha","doi":"10.1063/1.5113343","DOIUrl":"https://doi.org/10.1063/1.5113343","url":null,"abstract":"The composites of BaFe12O19 and BaTiO3 having composition xBaTiO3 - (1-x)BaFe12O19 (x=0.10 and 0.20) were prepared by commercial solid state reaction method. The Rietveld refinement revealed the hexagonal phase with space group P63/mmc for BaFe12O19 and tetragonal phase with space group P4mm for BaTiO3. No appreciable phase changes take place in samples. The dielectric response of dielectric constant (e′) and dielectric loss (tanδ) in the low frequency region was analyzed in the light of Maxwell Wagner model. Further impedance studies help to study the microstructure of the material and also show the grain and grain boundary contribution in the prepared samples.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"38 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84864072","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J. Tripathi, Amit L. Sharma, R. Bisen, D. Kumar, M. Gupta, Prashant Gupta, S. Tripathi
In the present study, the investigations on an ultra thin wedge thin film prepared by Ion Beam Sputtering (IBS) technique are presented. This film consists of a Co ultrathin wedge layer (thickness ranging from 0.5nm-4nm) sandwiched between a pair of Au layers. The thickness dependent structural and magnetic properties measured are reported. Three different locations, the lowest, middle and the highest thickness were probed for the present work. The X-ray reflectivity measurements reveal roughness induced intermixing of Co and Au layers. However, no signature of alloy formation is observed. X-ray diffraction measurements show polycrystalline nature of film. The hysteresis loops are not properly seen on lowest thickness side of film due to very less number of magnetic Co particles, but when the thickness is high enough show the ferromagnetic character then clear ferromagnetic hysteresis loop is observed and the coercivity is seen to increase with increase in Co layer thickness. The overall results are interpreted in terms of growth of Co particles in between adjacent Au layers.In the present study, the investigations on an ultra thin wedge thin film prepared by Ion Beam Sputtering (IBS) technique are presented. This film consists of a Co ultrathin wedge layer (thickness ranging from 0.5nm-4nm) sandwiched between a pair of Au layers. The thickness dependent structural and magnetic properties measured are reported. Three different locations, the lowest, middle and the highest thickness were probed for the present work. The X-ray reflectivity measurements reveal roughness induced intermixing of Co and Au layers. However, no signature of alloy formation is observed. X-ray diffraction measurements show polycrystalline nature of film. The hysteresis loops are not properly seen on lowest thickness side of film due to very less number of magnetic Co particles, but when the thickness is high enough show the ferromagnetic character then clear ferromagnetic hysteresis loop is observed and the coercivity is seen to increase with increase in Co layer thickness. The overall results are inter...
{"title":"Thickness dependent structural and magnetic properties of Au/Co/Si (100) ultra-thin wedge film","authors":"J. Tripathi, Amit L. Sharma, R. Bisen, D. Kumar, M. Gupta, Prashant Gupta, S. Tripathi","doi":"10.1063/1.5113144","DOIUrl":"https://doi.org/10.1063/1.5113144","url":null,"abstract":"In the present study, the investigations on an ultra thin wedge thin film prepared by Ion Beam Sputtering (IBS) technique are presented. This film consists of a Co ultrathin wedge layer (thickness ranging from 0.5nm-4nm) sandwiched between a pair of Au layers. The thickness dependent structural and magnetic properties measured are reported. Three different locations, the lowest, middle and the highest thickness were probed for the present work. The X-ray reflectivity measurements reveal roughness induced intermixing of Co and Au layers. However, no signature of alloy formation is observed. X-ray diffraction measurements show polycrystalline nature of film. The hysteresis loops are not properly seen on lowest thickness side of film due to very less number of magnetic Co particles, but when the thickness is high enough show the ferromagnetic character then clear ferromagnetic hysteresis loop is observed and the coercivity is seen to increase with increase in Co layer thickness. The overall results are interpreted in terms of growth of Co particles in between adjacent Au layers.In the present study, the investigations on an ultra thin wedge thin film prepared by Ion Beam Sputtering (IBS) technique are presented. This film consists of a Co ultrathin wedge layer (thickness ranging from 0.5nm-4nm) sandwiched between a pair of Au layers. The thickness dependent structural and magnetic properties measured are reported. Three different locations, the lowest, middle and the highest thickness were probed for the present work. The X-ray reflectivity measurements reveal roughness induced intermixing of Co and Au layers. However, no signature of alloy formation is observed. X-ray diffraction measurements show polycrystalline nature of film. The hysteresis loops are not properly seen on lowest thickness side of film due to very less number of magnetic Co particles, but when the thickness is high enough show the ferromagnetic character then clear ferromagnetic hysteresis loop is observed and the coercivity is seen to increase with increase in Co layer thickness. The overall results are inter...","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87452235","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}
Riyajul Islam, Molongnenla, D. Saikia, J. P. Borah
A comparative study of the structural, electronic and magnetic properties of ferrimagnetic cubic spinel magnetite (Fe3O4) has been performed in the present report, using LDA, GGA with PBE functional and GGA+U approximations within the framework of density functional theory. Study reveals smaller relative deviations in the structural parameters from the experimental data with GGA compared to LDA. Total DOS and band structure results demonstrate half metallic behavior of Fe3O4. The value of the band gap calculated by GGA+U is found to be higher than that calculated by GGA and LDA which is in good agreement with the experimental value. The total magnetic moments of Fe3O4 are found to be nearly equal in all the approximations whereas the values of the partial magnetic moments of Fe and O are increased and decreased respectively in GGA +U.A comparative study of the structural, electronic and magnetic properties of ferrimagnetic cubic spinel magnetite (Fe3O4) has been performed in the present report, using LDA, GGA with PBE functional and GGA+U approximations within the framework of density functional theory. Study reveals smaller relative deviations in the structural parameters from the experimental data with GGA compared to LDA. Total DOS and band structure results demonstrate half metallic behavior of Fe3O4. The value of the band gap calculated by GGA+U is found to be higher than that calculated by GGA and LDA which is in good agreement with the experimental value. The total magnetic moments of Fe3O4 are found to be nearly equal in all the approximations whereas the values of the partial magnetic moments of Fe and O are increased and decreased respectively in GGA +U.
{"title":"First principle investigation of the electronic structure of spinel Fe3O4","authors":"Riyajul Islam, Molongnenla, D. Saikia, J. P. Borah","doi":"10.1063/1.5113187","DOIUrl":"https://doi.org/10.1063/1.5113187","url":null,"abstract":"A comparative study of the structural, electronic and magnetic properties of ferrimagnetic cubic spinel magnetite (Fe3O4) has been performed in the present report, using LDA, GGA with PBE functional and GGA+U approximations within the framework of density functional theory. Study reveals smaller relative deviations in the structural parameters from the experimental data with GGA compared to LDA. Total DOS and band structure results demonstrate half metallic behavior of Fe3O4. The value of the band gap calculated by GGA+U is found to be higher than that calculated by GGA and LDA which is in good agreement with the experimental value. The total magnetic moments of Fe3O4 are found to be nearly equal in all the approximations whereas the values of the partial magnetic moments of Fe and O are increased and decreased respectively in GGA +U.A comparative study of the structural, electronic and magnetic properties of ferrimagnetic cubic spinel magnetite (Fe3O4) has been performed in the present report, using LDA, GGA with PBE functional and GGA+U approximations within the framework of density functional theory. Study reveals smaller relative deviations in the structural parameters from the experimental data with GGA compared to LDA. Total DOS and band structure results demonstrate half metallic behavior of Fe3O4. The value of the band gap calculated by GGA+U is found to be higher than that calculated by GGA and LDA which is in good agreement with the experimental value. The total magnetic moments of Fe3O4 are found to be nearly equal in all the approximations whereas the values of the partial magnetic moments of Fe and O are increased and decreased respectively in GGA +U.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82636005","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}
Sheril Ann Mathew, P. Praveena, Y. S. Hubert, V. Narayanan, A. Stephen
Amino-functionalized carbon dots were synthesized by the simple carbonization technique and its unique optical properties were studied. The Ultraviolet - Visible (UV-Vis) absorption spectrum clearly indicated formation of carbon dots. Photoluminescent (PL) studies were performed and the highest intensity in the emission spectra was observed at an excitation wavelength of 280 nm. The Fourier Transform Infrared Spectrum (FTIR) and X-ray diffraction (XRD) pattern showed peaks corresponding to chitosan and carbon dots. The external morphology of the as-prepared sample was studied using Atomic Force Microscopy (AFM) technique from which uniformly distributed spherical morphology of the carbon dots was observed. Since the synthesized nanocomposite exhibits excellent photoluminescent property and superior biocompatibility, it can be used as an efficient material for biomedical applications.Amino-functionalized carbon dots were synthesized by the simple carbonization technique and its unique optical properties were studied. The Ultraviolet - Visible (UV-Vis) absorption spectrum clearly indicated formation of carbon dots. Photoluminescent (PL) studies were performed and the highest intensity in the emission spectra was observed at an excitation wavelength of 280 nm. The Fourier Transform Infrared Spectrum (FTIR) and X-ray diffraction (XRD) pattern showed peaks corresponding to chitosan and carbon dots. The external morphology of the as-prepared sample was studied using Atomic Force Microscopy (AFM) technique from which uniformly distributed spherical morphology of the carbon dots was observed. Since the synthesized nanocomposite exhibits excellent photoluminescent property and superior biocompatibility, it can be used as an efficient material for biomedical applications.
{"title":"Luminescent carbon dots/chitosan nanocomposite for bioimaging","authors":"Sheril Ann Mathew, P. Praveena, Y. S. Hubert, V. Narayanan, A. Stephen","doi":"10.1063/1.5112991","DOIUrl":"https://doi.org/10.1063/1.5112991","url":null,"abstract":"Amino-functionalized carbon dots were synthesized by the simple carbonization technique and its unique optical properties were studied. The Ultraviolet - Visible (UV-Vis) absorption spectrum clearly indicated formation of carbon dots. Photoluminescent (PL) studies were performed and the highest intensity in the emission spectra was observed at an excitation wavelength of 280 nm. The Fourier Transform Infrared Spectrum (FTIR) and X-ray diffraction (XRD) pattern showed peaks corresponding to chitosan and carbon dots. The external morphology of the as-prepared sample was studied using Atomic Force Microscopy (AFM) technique from which uniformly distributed spherical morphology of the carbon dots was observed. Since the synthesized nanocomposite exhibits excellent photoluminescent property and superior biocompatibility, it can be used as an efficient material for biomedical applications.Amino-functionalized carbon dots were synthesized by the simple carbonization technique and its unique optical properties were studied. The Ultraviolet - Visible (UV-Vis) absorption spectrum clearly indicated formation of carbon dots. Photoluminescent (PL) studies were performed and the highest intensity in the emission spectra was observed at an excitation wavelength of 280 nm. The Fourier Transform Infrared Spectrum (FTIR) and X-ray diffraction (XRD) pattern showed peaks corresponding to chitosan and carbon dots. The external morphology of the as-prepared sample was studied using Atomic Force Microscopy (AFM) technique from which uniformly distributed spherical morphology of the carbon dots was observed. Since the synthesized nanocomposite exhibits excellent photoluminescent property and superior biocompatibility, it can be used as an efficient material for biomedical applications.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"125 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88090319","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}
I. Peter, S. Dhinakaran, K. Ramachandran, P. Nithiananthi
The photovoltaic characteristics of TiO2/CdS/Bi2S3 quantum dots based solar cell is reported here. TiO2 nanospheres were synthesized by a rapid microwave treatment and CdS quantum dots were grown on the TiO2 by successive ionic layer adsorption and reaction (SILAR) method optimizing the microwave irradiation time. XRD results reveal that all the obtained TiO2 samples are of tetragonal structure. Morphology of these TiO2 appear as nanospheres from SEM and TEM measurements with sizes ranging from 200 to 300 nm. J-V measurements on TiO2/CdS/Bi2S3 structure based solar cell show a maximum photocurrent of 7.23 mA/cm2, open circuit voltage 0.4 V, fill factor 0.35 and efficiency 1.012 % compared to other configurations. This enhancement is due to the synergistic assistance of CdS/Bi2S3 structure in increasing the charge transfer rates, extension of the photo-absorption range and hence the light harvesting capacity. Hence these types of heterostructures can be effectively used in photovoltaic devices.The photovoltaic characteristics of TiO2/CdS/Bi2S3 quantum dots based solar cell is reported here. TiO2 nanospheres were synthesized by a rapid microwave treatment and CdS quantum dots were grown on the TiO2 by successive ionic layer adsorption and reaction (SILAR) method optimizing the microwave irradiation time. XRD results reveal that all the obtained TiO2 samples are of tetragonal structure. Morphology of these TiO2 appear as nanospheres from SEM and TEM measurements with sizes ranging from 200 to 300 nm. J-V measurements on TiO2/CdS/Bi2S3 structure based solar cell show a maximum photocurrent of 7.23 mA/cm2, open circuit voltage 0.4 V, fill factor 0.35 and efficiency 1.012 % compared to other configurations. This enhancement is due to the synergistic assistance of CdS/Bi2S3 structure in increasing the charge transfer rates, extension of the photo-absorption range and hence the light harvesting capacity. Hence these types of heterostructures can be effectively used in photovoltaic devices.
{"title":"Performance of TiO2/CdS/Bi2S3 heterostructure based semiconductor sensitized solar cell","authors":"I. Peter, S. Dhinakaran, K. Ramachandran, P. Nithiananthi","doi":"10.1063/1.5113396","DOIUrl":"https://doi.org/10.1063/1.5113396","url":null,"abstract":"The photovoltaic characteristics of TiO2/CdS/Bi2S3 quantum dots based solar cell is reported here. TiO2 nanospheres were synthesized by a rapid microwave treatment and CdS quantum dots were grown on the TiO2 by successive ionic layer adsorption and reaction (SILAR) method optimizing the microwave irradiation time. XRD results reveal that all the obtained TiO2 samples are of tetragonal structure. Morphology of these TiO2 appear as nanospheres from SEM and TEM measurements with sizes ranging from 200 to 300 nm. J-V measurements on TiO2/CdS/Bi2S3 structure based solar cell show a maximum photocurrent of 7.23 mA/cm2, open circuit voltage 0.4 V, fill factor 0.35 and efficiency 1.012 % compared to other configurations. This enhancement is due to the synergistic assistance of CdS/Bi2S3 structure in increasing the charge transfer rates, extension of the photo-absorption range and hence the light harvesting capacity. Hence these types of heterostructures can be effectively used in photovoltaic devices.The photovoltaic characteristics of TiO2/CdS/Bi2S3 quantum dots based solar cell is reported here. TiO2 nanospheres were synthesized by a rapid microwave treatment and CdS quantum dots were grown on the TiO2 by successive ionic layer adsorption and reaction (SILAR) method optimizing the microwave irradiation time. XRD results reveal that all the obtained TiO2 samples are of tetragonal structure. Morphology of these TiO2 appear as nanospheres from SEM and TEM measurements with sizes ranging from 200 to 300 nm. J-V measurements on TiO2/CdS/Bi2S3 structure based solar cell show a maximum photocurrent of 7.23 mA/cm2, open circuit voltage 0.4 V, fill factor 0.35 and efficiency 1.012 % compared to other configurations. This enhancement is due to the synergistic assistance of CdS/Bi2S3 structure in increasing the charge transfer rates, extension of the photo-absorption range and hence the light harvesting capacity. Hence these types of heterostructures can be effectively used in photovoltaic devices.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"s3-22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90813176","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. Das, Spandana Kornepati, Jonmani Rabha, Pamu Dobbidi
Apatite coatings on Titanium substrates have received widespread attention in biomedical industry as implant devices for hip replacement and similar surgeries. The microstructural and mechanical properties of apatite films tend to play very important role in enhancing the osteobonding capacities of the surgical implants. Implants without such coatings are often found to dissociate from the host bones due to poor initial bone growth on its surface and stress and strain imbalance related issues. In this investigation, an effort has been made to study the microstructural properties of the apatite grown on the titanium surfaces by non-destructive X ray diffraction (XRD), Raman spectra and FESEM. The analysis revealed that bone like apatite could be grown successfully over titanium substrates which could be used in biomedical industry as bone implants.Apatite coatings on Titanium substrates have received widespread attention in biomedical industry as implant devices for hip replacement and similar surgeries. The microstructural and mechanical properties of apatite films tend to play very important role in enhancing the osteobonding capacities of the surgical implants. Implants without such coatings are often found to dissociate from the host bones due to poor initial bone growth on its surface and stress and strain imbalance related issues. In this investigation, an effort has been made to study the microstructural properties of the apatite grown on the titanium surfaces by non-destructive X ray diffraction (XRD), Raman spectra and FESEM. The analysis revealed that bone like apatite could be grown successfully over titanium substrates which could be used in biomedical industry as bone implants.
{"title":"Microstructural study of bone like apatite deposited by a biomimetic process","authors":"A. Das, Spandana Kornepati, Jonmani Rabha, Pamu Dobbidi","doi":"10.1063/1.5112892","DOIUrl":"https://doi.org/10.1063/1.5112892","url":null,"abstract":"Apatite coatings on Titanium substrates have received widespread attention in biomedical industry as implant devices for hip replacement and similar surgeries. The microstructural and mechanical properties of apatite films tend to play very important role in enhancing the osteobonding capacities of the surgical implants. Implants without such coatings are often found to dissociate from the host bones due to poor initial bone growth on its surface and stress and strain imbalance related issues. In this investigation, an effort has been made to study the microstructural properties of the apatite grown on the titanium surfaces by non-destructive X ray diffraction (XRD), Raman spectra and FESEM. The analysis revealed that bone like apatite could be grown successfully over titanium substrates which could be used in biomedical industry as bone implants.Apatite coatings on Titanium substrates have received widespread attention in biomedical industry as implant devices for hip replacement and similar surgeries. The microstructural and mechanical properties of apatite films tend to play very important role in enhancing the osteobonding capacities of the surgical implants. Implants without such coatings are often found to dissociate from the host bones due to poor initial bone growth on its surface and stress and strain imbalance related issues. In this investigation, an effort has been made to study the microstructural properties of the apatite grown on the titanium surfaces by non-destructive X ray diffraction (XRD), Raman spectra and FESEM. The analysis revealed that bone like apatite could be grown successfully over titanium substrates which could be used in biomedical industry as bone implants.","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":"90867967","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}
Langmuir monolayers of human serum albumin (HSA) are formed on water surface at neutral pH (≈ 7.0) in absence and presence of Ca2+ ions in aqueous subphase. Compression-decompression surface pressure (π) - specific molecular area (A) isotherm cycle for both the conditions are recorded to compare the corresponding hysteresis behaviours. It is seen from the isotherms that in pure water compression curve of HSA monolayer tries to follow the decompression curve, whereas it is almost similar in presence of Ca2+ ions. Topographical features of the HSA monolayer at the air-water interface are obtained from Brewster angle microscopy (BAM). Protein films are also deposited in Si (001) substrates at lower and higher surface pressures, i.e., at 5 and 18 mN/m and are investigated by Atomic Force Microscopy (AFM) to explore out-of-plane structure and surface morphology. Although nearly homogeneous layer is formed by the HSA protein at the air-water interface before and after interaction with calcium ions, but slight conformation variation of protein takes place in presence of ions and accordingly the elastic behavior of monolayer changes under mechanical compression and expansion.Langmuir monolayers of human serum albumin (HSA) are formed on water surface at neutral pH (≈ 7.0) in absence and presence of Ca2+ ions in aqueous subphase. Compression-decompression surface pressure (π) - specific molecular area (A) isotherm cycle for both the conditions are recorded to compare the corresponding hysteresis behaviours. It is seen from the isotherms that in pure water compression curve of HSA monolayer tries to follow the decompression curve, whereas it is almost similar in presence of Ca2+ ions. Topographical features of the HSA monolayer at the air-water interface are obtained from Brewster angle microscopy (BAM). Protein films are also deposited in Si (001) substrates at lower and higher surface pressures, i.e., at 5 and 18 mN/m and are investigated by Atomic Force Microscopy (AFM) to explore out-of-plane structure and surface morphology. Although nearly homogeneous layer is formed by the HSA protein at the air-water interface before and after interaction with calcium ions, but slight c...
{"title":"Monolayer behavior of human serum albumin (HSA) at air-water interface","authors":"Raktim Sarmah, B. Sah, S. Kundu","doi":"10.1063/1.5112882","DOIUrl":"https://doi.org/10.1063/1.5112882","url":null,"abstract":"Langmuir monolayers of human serum albumin (HSA) are formed on water surface at neutral pH (≈ 7.0) in absence and presence of Ca2+ ions in aqueous subphase. Compression-decompression surface pressure (π) - specific molecular area (A) isotherm cycle for both the conditions are recorded to compare the corresponding hysteresis behaviours. It is seen from the isotherms that in pure water compression curve of HSA monolayer tries to follow the decompression curve, whereas it is almost similar in presence of Ca2+ ions. Topographical features of the HSA monolayer at the air-water interface are obtained from Brewster angle microscopy (BAM). Protein films are also deposited in Si (001) substrates at lower and higher surface pressures, i.e., at 5 and 18 mN/m and are investigated by Atomic Force Microscopy (AFM) to explore out-of-plane structure and surface morphology. Although nearly homogeneous layer is formed by the HSA protein at the air-water interface before and after interaction with calcium ions, but slight conformation variation of protein takes place in presence of ions and accordingly the elastic behavior of monolayer changes under mechanical compression and expansion.Langmuir monolayers of human serum albumin (HSA) are formed on water surface at neutral pH (≈ 7.0) in absence and presence of Ca2+ ions in aqueous subphase. Compression-decompression surface pressure (π) - specific molecular area (A) isotherm cycle for both the conditions are recorded to compare the corresponding hysteresis behaviours. It is seen from the isotherms that in pure water compression curve of HSA monolayer tries to follow the decompression curve, whereas it is almost similar in presence of Ca2+ ions. Topographical features of the HSA monolayer at the air-water interface are obtained from Brewster angle microscopy (BAM). Protein films are also deposited in Si (001) substrates at lower and higher surface pressures, i.e., at 5 and 18 mN/m and are investigated by Atomic Force Microscopy (AFM) to explore out-of-plane structure and surface morphology. Although nearly homogeneous layer is formed by the HSA protein at the air-water interface before and after interaction with calcium ions, but slight c...","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"78 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90973103","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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