DAE SOLID STATE PHYSICS SYMPOSIUM 2018最新文献

{"title":"Preparation and electronic structure study of a topological crystalline insulator, SnTe","authors":"Arindam Pramanik, R. Pandeya, S. Thakur, A. Thamizhavel, K. Maiti","doi":"10.1063/1.5113182","DOIUrl":"https://doi.org/10.1063/1.5113182","url":null,"abstract":"In this paper, we report preparation and characterization of high quality single crystals of a topological crystalline insulator, SnTe. Samples were prepared using modified Bridgman method and were characterized by powder diffraction, Laue diffraction and energy dispersive x-ray diffraction method. From the resistivity measurements, the temperature for the displacive phase transition is determined to be 40 K. Furthermore, core level photoemission of Sn 3s and Te 3p using photon energy of 5945.24 eV at different temperatures shows that structural transition does not have discernible effect on the studied core level spectra. We observe intense satellite features in the core level spectra suggesting importance of electron correlation in the electronic properties of this system.In this paper, we report preparation and characterization of high quality single crystals of a topological crystalline insulator, SnTe. Samples were prepared using modified Bridgman method and were characterized by powder diffraction, Laue diffraction and energy dispersive x-ray diffraction method. From the resistivity measurements, the temperature for the displacive phase transition is determined to be 40 K. Furthermore, core level photoemission of Sn 3s and Te 3p using photon energy of 5945.24 eV at different temperatures shows that structural transition does not have discernible effect on the studied core level spectra. We observe intense satellite features in the core level spectra suggesting importance of electron correlation in the electronic properties of this system.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87652344","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}

{"title":"Green synthesis of gold-silver core-shell nanoparticles and its characterizations","authors":"A. Roy, B. Mohanta","doi":"10.1063/1.5113020","DOIUrl":"https://doi.org/10.1063/1.5113020","url":null,"abstract":"Core shell nanoparticles have become an interesting topic of research because of their enhanced optical, catalytic and antibacterial property. Several alloy type nanoparticles have been synthesized like gold-silver, silver-gold, gold–silica, silver–silica, gold-platinum etc. In the present study we have demonstrated a new wet chemical route to synthesize gold-silver core shell nanoparticles using a medicinal plant extract, which act both as reducing agent and stabilizing agent. The method is facile and very fast. In the synthesis process, pre–synthesized spherical gold nano particles of 20-30 nm size served as nucleation sites for silver ions that formed coating over the gold core. The synthesized gold nano particles have been characterized by uv-vis spectroscopy, Transmission Electron Microscope (TEM) and zeta-potential analyser.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87120011","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}

{"title":"Temperature dependent I-V characteristics of Ni doped topological insulator Bi2Se3 nanoparticles","authors":"K. Mazumder, Alfa Sharma, Y. Kumar, P. Shirage","doi":"10.1063/1.5112986","DOIUrl":"https://doi.org/10.1063/1.5112986","url":null,"abstract":"Nanostructures of Bismuth Selenide (Bi2Se3), a 3D topological insulator material and Nickel (Ni) doped Bi2Se3 samples were prepared by a hydrothermal method to explore the I-V characteristics. The structural, morphological and optical properties were characterized by XRD, FESEM and UV-vis spectroscopy respectively. The temperature dependent I-V shows an enhancement in the current carrying properties of Ni doped Bi2Se3 due to surface defects and tailoring of optical properties. This study proposes applicability of Bi2Se3 topological insulators as next generation quantum computing materials.Nanostructures of Bismuth Selenide (Bi2Se3), a 3D topological insulator material and Nickel (Ni) doped Bi2Se3 samples were prepared by a hydrothermal method to explore the I-V characteristics. The structural, morphological and optical properties were characterized by XRD, FESEM and UV-vis spectroscopy respectively. The temperature dependent I-V shows an enhancement in the current carrying properties of Ni doped Bi2Se3 due to surface defects and tailoring of optical properties. This study proposes applicability of Bi2Se3 topological insulators as next generation quantum computing materials.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"51 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90628678","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}

{"title":"Structural stability and electronic structure of Cr substituted MoS2: An ab-initio study","authors":"Aloka Ranjan Sahoo, S. Jaya","doi":"10.1063/1.5113232","DOIUrl":"https://doi.org/10.1063/1.5113232","url":null,"abstract":"Using first principle calculations, we studied the structural stability and electronic structure of Cr substituted MoS2. Different configurations corresponding to the substitution of two Cr atoms in a supercell of 96 atoms in the system are considered in our study. Our studies showed that the band gap of the system is preserved even when the system is substituted with two Cr atoms at the Mo positions in the supercell. The substituted system is found to be non-magnetic as the Cr atoms do not show any magnetic moment. We have evaluated the atom and orbital projected density of states of the system and the Cr d-states are found to lie at the bottom of the conduction band.Using first principle calculations, we studied the structural stability and electronic structure of Cr substituted MoS2. Different configurations corresponding to the substitution of two Cr atoms in a supercell of 96 atoms in the system are considered in our study. Our studies showed that the band gap of the system is preserved even when the system is substituted with two Cr atoms at the Mo positions in the supercell. The substituted system is found to be non-magnetic as the Cr atoms do not show any magnetic moment. We have evaluated the atom and orbital projected density of states of the system and the Cr d-states are found to lie at the bottom of the conduction band.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"226 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85570653","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}

{"title":"Ab-initio modelling of new cathode material for Li-ion battery based on the Ti substituted Li2Fe(SO4)2","authors":"Vivek Christhunathan, A. Augustine, Vishnu Sudarsanan, N. Vairamoorthy, P. Ravindran","doi":"10.1063/1.5113447","DOIUrl":"https://doi.org/10.1063/1.5113447","url":null,"abstract":"This work demonstrates the battery-related properties of Li2Fe(SO4)2 and its Fe site Ti substituted derivatives (Li2Ti0.5Fe0.5(SO4)2 and Li2Ti(SO4)2) using ab-initio calculations. The calculated voltage profile of all these systems clearly indicates the increase of voltage with delithiation. Even though the average voltage values of Ti-substituted systems gradually changes with the Ti concentration, they are still in the range of requirement for a good cathode material. In most of the cases, Ti substitutions increase the specific capacity and energy density of Li2Fe(SO4)2. The negative enthalpy of formation implies that all the considered systems are thermodynamically stable. These results indicate that Ti-substituted Li2Fe(SO4)2 could be a potential cathode material for rechargeable Li-ion batteries.This work demonstrates the battery-related properties of Li2Fe(SO4)2 and its Fe site Ti substituted derivatives (Li2Ti0.5Fe0.5(SO4)2 and Li2Ti(SO4)2) using ab-initio calculations. The calculated voltage profile of all these systems clearly indicates the increase of voltage with delithiation. Even though the average voltage values of Ti-substituted systems gradually changes with the Ti concentration, they are still in the range of requirement for a good cathode material. In most of the cases, Ti substitutions increase the specific capacity and energy density of Li2Fe(SO4)2. The negative enthalpy of formation implies that all the considered systems are thermodynamically stable. These results indicate that Ti-substituted Li2Fe(SO4)2 could be a potential cathode material for rechargeable Li-ion batteries.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"153 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73717732","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}

{"title":"SANS investigation of structure and stability of water/AOT/dodecane microemulsion droplets","authors":"S. Abbas, D. Saha, V. Aswal","doi":"10.1063/1.5112873","DOIUrl":"https://doi.org/10.1063/1.5112873","url":null,"abstract":"The formation and stabilization of water/AOT/dodecane microemulsion (water in oil) droplets by employing Small Angle Neutron Scattering (SANS) is demonstrated. The resulting structure exhibits strong inter-droplet attractive interaction that can be tuned by molar ratio (W) of water to AOT concentration. The strengthening of the inter-droplet attractive interaction with increase in W has been modeled using modified Ornstein-Zernicke relation. We further demonstrate that on addition of salt (NaCl), the inter-droplet attractive interaction is substantially weakened and hence the droplet stability is enhanced. The SANS data analysis confirms the monotonic decrease in both the correlation length and compressibility with increase in salt concentrations indicating the formation of microemulsion droplet system with increased stability and that the stability could be achieved for higher values of W with salt.The formation and stabilization of water/AOT/dodecane microemulsion (water in oil) droplets by employing Small Angle Neutron Scattering (SANS) is demonstrated. The resulting structure exhibits strong inter-droplet attractive interaction that can be tuned by molar ratio (W) of water to AOT concentration. The strengthening of the inter-droplet attractive interaction with increase in W has been modeled using modified Ornstein-Zernicke relation. We further demonstrate that on addition of salt (NaCl), the inter-droplet attractive interaction is substantially weakened and hence the droplet stability is enhanced. The SANS data analysis confirms the monotonic decrease in both the correlation length and compressibility with increase in salt concentrations indicating the formation of microemulsion droplet system with increased stability and that the stability could be achieved for higher values of W with salt.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"42 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73700502","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}

{"title":"Magneto-viscosity of platelet shaped Ba-Sr ferrite nanoparticles based ferrofluid in different colloids","authors":"N. Gautam, Rajender Singh","doi":"10.1063/1.5112992","DOIUrl":"https://doi.org/10.1063/1.5112992","url":null,"abstract":"In this work, we present the magnetic response of the flow properties of water based and paraffin oil based Ba-Sr ferrite ferrofluids. The platelet particles act as tiny magnetic discs in the ferrofluids and these ferrofluids are promising fluids for obtaining the better flow control in the presence of magnetic field. The nanoparticles of composition of Ba0.8Sr0.2Fe12O19(BSM) were synthesized by hydrothermal synthesis. The single phase magnetoplumbite structure is observed from the X-ray diffraction pattern of the platelet particles. The hexagonal disc of 5 to 7 nm thickness and 50 to 250 nm in size are seen in the field emission electron microscope and transmission electron microscope micrographs. The magnetization plots show ferromagnetic behavior of the nanoparticles. The magneto-viscosity show high variation in the low field range due to the chain formation of the suspensions in the ferrofluid. The flow curves exhibit power law variation with shear rate at applied magnetic fields.In this work, we present the magnetic response of the flow properties of water based and paraffin oil based Ba-Sr ferrite ferrofluids. The platelet particles act as tiny magnetic discs in the ferrofluids and these ferrofluids are promising fluids for obtaining the better flow control in the presence of magnetic field. The nanoparticles of composition of Ba0.8Sr0.2Fe12O19(BSM) were synthesized by hydrothermal synthesis. The single phase magnetoplumbite structure is observed from the X-ray diffraction pattern of the platelet particles. The hexagonal disc of 5 to 7 nm thickness and 50 to 250 nm in size are seen in the field emission electron microscope and transmission electron microscope micrographs. The magnetization plots show ferromagnetic behavior of the nanoparticles. The magneto-viscosity show high variation in the low field range due to the chain formation of the suspensions in the ferrofluid. The flow curves exhibit power law variation with shear rate at applied magnetic fields.","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":"74962603","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}

{"title":"Conductometric sensing characteristics of nanoplatelet Bi2WO6 as nanosensor for hydrogen detection","authors":"R. Radha, R. A. Rakkesh, S. Balakumar","doi":"10.1063/1.5113156","DOIUrl":"https://doi.org/10.1063/1.5113156","url":null,"abstract":"In this work, nanoplatelets of Bi2WO6 were synthesized by facile co-precipitation method followed by physical processing of the precipitate using ultrasonic waves. The X-Ray diffraction (XRD) results confirmed the orthorhombic structure of Bi2WO6, whereas the field emission scanning electron microscopy (FESEM) images revealed nanoplatelet morphology. Chemical analysis was done using X-ray photoelectron spectroscopy (XPS). Thus formation mechanism Bi2WO6 nanoplatelets (NPs) by the method of co-precipitation coupled with ultrasonic waves has been discussed. Gas sensing property of as synthesized Bi2WO6 nanoplatelets was analysed using hydrogen as target gas, a first of its kind. Interestingly a significant decrease in operating temperature was noticed when compared to the available reports for which the mechanism has been demonstrated.In this work, nanoplatelets of Bi2WO6 were synthesized by facile co-precipitation method followed by physical processing of the precipitate using ultrasonic waves. The X-Ray diffraction (XRD) results confirmed the orthorhombic structure of Bi2WO6, whereas the field emission scanning electron microscopy (FESEM) images revealed nanoplatelet morphology. Chemical analysis was done using X-ray photoelectron spectroscopy (XPS). Thus formation mechanism Bi2WO6 nanoplatelets (NPs) by the method of co-precipitation coupled with ultrasonic waves has been discussed. Gas sensing property of as synthesized Bi2WO6 nanoplatelets was analysed using hydrogen as target gas, a first of its kind. Interestingly a significant decrease in operating temperature was noticed when compared to the available reports for which the mechanism has been demonstrated.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"39 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77643291","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}

{"title":"Conductive glass coating: Effect of atmospheric plasma treatment","authors":"A. Roy, A. Mukhopadhyay, Shilabati Hembram, M. Ghosh, A. Majumdar","doi":"10.1063/1.5113087","DOIUrl":"https://doi.org/10.1063/1.5113087","url":null,"abstract":"The application of conductive glass coating in recent years plays a significant role in research and commercial laboratories. We report the change in conducting property of Cu-Ti-Cl thin film coating onto glass substrate as a function of atmospheric pressure plasma (Ar+) treatment (upto 15 minutes). This metal-transition metal chloride coating is prepared by chemical solution process where polyvinyl alcohol (PVA) is used as a chelating agent. The UV-Vis absorption spectra reveal that the optical band gap of the thin film varies from 1.71eV to 2.51eV. A reduction in dc static resistance (2.1MΩ to 0.5MΩ) of the film is obtained from the voltage-current characteristics. The X-ray diffraction peak intensity also reduces with treatment time.The application of conductive glass coating in recent years plays a significant role in research and commercial laboratories. We report the change in conducting property of Cu-Ti-Cl thin film coating onto glass substrate as a function of atmospheric pressure plasma (Ar+) treatment (upto 15 minutes). This metal-transition metal chloride coating is prepared by chemical solution process where polyvinyl alcohol (PVA) is used as a chelating agent. The UV-Vis absorption spectra reveal that the optical band gap of the thin film varies from 1.71eV to 2.51eV. A reduction in dc static resistance (2.1MΩ to 0.5MΩ) of the film is obtained from the voltage-current characteristics. The X-ray diffraction peak intensity also reduces with treatment time.","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76353416","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}

{"title":"Static light scattering studies of polymer colloids","authors":"D. Joseph, Krishan Kumar","doi":"10.1063/1.5112893","DOIUrl":"https://doi.org/10.1063/1.5112893","url":null,"abstract":"Static light scattering (SLS) has been used to study polymer monodisperse particles (Colloids). Dilute polymer particle of diameter 0.38 µm dilute colloidal system has been synthesized to avoid multiple scattering. Colloidal particles can form lattices according to DLVO theory, where they interact by Coulombic repulsion and Vander walls attractive force (DLVO Potential whenever the repulsive potential dominate the particles begins to interact strongly to form bcc, fcc or other lattice structures in the colloids. This is defined by structure factor S (Q) in a colloidal system. On the contrary, when attractive forces dominate in the colloids, the particles begin to form clusters. The present studies, however deals with dilute solution and therefore scattering take place from individual particle. This give rise to single particles scattering revealing morphology of particle. Static light scattering (SLS) can be affectively used as a technique for single particle scattering. The present study uses unpolarized light and polarized light (linear and circular) to study the effect of polarization over the single particle scattering event.Static light scattering (SLS) has been used to study polymer monodisperse particles (Colloids). Dilute polymer particle of diameter 0.38 µm dilute colloidal system has been synthesized to avoid multiple scattering. Colloidal particles can form lattices according to DLVO theory, where they interact by Coulombic repulsion and Vander walls attractive force (DLVO Potential whenever the repulsive potential dominate the particles begins to interact strongly to form bcc, fcc or other lattice structures in the colloids. This is defined by structure factor S (Q) in a colloidal system. On the contrary, when attractive forces dominate in the colloids, the particles begin to form clusters. The present studies, however deals with dilute solution and therefore scattering take place from individual particle. This give rise to single particles scattering revealing morphology of particle. Static light scattering (SLS) can be affectively used as a technique for single particle scattering. The present study uses unpolarized...","PeriodicalId":10874,"journal":{"name":"DAE SOLID STATE PHYSICS SYMPOSIUM 2018","volume":"46 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77929900","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}