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RISS 인기검색어
- 검색키워드
- 저자 : Sharma Kriti (검색결과 4 건)
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Kriti Sharma,Alaa S. Al-Kabbi,G.S.S. Saini,S.K. Tripathi 한국물리학회 2013 Current Applied Physics Vol.13 No.6
Nanocrystalline cadmium selenide (nc-CdSe) thin films have been prepared by thermal evaporation using the inert gas condensation (IGC) technique. Transmission electron microscopy (TEM) studies show that the CdSe nanocrystals (NCs) are spherical in shape. Constant photocurrent method (CPM) is used to determine the value of absorption coefficient in low absorption region of as-deposited, annealed and light soaked nc-CdSe thin films. Values of optical band gap (Eg) have been determined by using Tauc’s relation for as-deposited, annealed and light soaked nc-CdSe thin films from the a values evaluated from reflection and transmission measurements. We have used a derivative procedure to sub-gap absorption spectra in order to get information on the energetic distribution of the occupied density of states below Fermi level. Constants such as optical gap Eg, Urbach edge Eu have been obtained from CPM spectra in asdeposited,annealed and light soaked nc-CdSe thin films. Concentration of defect states has also been calculated in as-deposited, annealed and light soaked nc-CdSe thin films.
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Kriti Sharma,Young-Kwon Park,Ashok Kumar Nadda,Priya Banerjee,Pradeep Singh,Pankaj Raizada,Fawzi Banat,G. Bharath,Sang Mun Jeong,Su Shiung Lam 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.109 No.-
Climate change is one of the major global concerns of 21st century, and the release of excessive greenhousegases (GHG) is the foremost reason behind. It has become imperative to either capture excessiveemission of GHG into the atmosphere or to develop advanced and efficient technologies for preventingfurther increase in its atmospheric concentration. Algal and microbial enzymes have been found to beeffective in catalyzing the conversion of GHG to value-added products like biofuels, chemicals, polymers,biogas, and bioelectricity etc. However, these enzymes yield better catalytic activities when applied incombination with nano-materials having similar prowess for capturing and converting GHG. Replacingconventional chemical production through GHG capture and utilization affects emission of the samethroughout the production chain (i.e., from cradle-to-gate). Herein, we analyze the technical potentialof hybrid chemo-biocatalytic processes for GHG capture and their utilization to produce valuable industrialcompounds. The study addresses the biosynthesis as well as genetic and metabolic engineering ofdifferent microbial enzymes for GHG sequestration and conversion. It also reviews recent literature ofusing different advanced materials for immobilization of enzymes and their subsequent application forGHG sequestration and conversion to valuable products.
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Three dimensional hollow sulphide nanocomposites for supercapacitor electrodes
Siwatch Poonam,Sharma Kriti,Manyani Nirmal,Kaur Ravneet,Tripathi S.K. 한국물리학회 2023 Current Applied Physics Vol.53 No.-
The transition metal sulphides have gained sufficient attraction due to their high theoretical capacitance, low electronegativity, good thermal and electrical conductivity and good redox behaviour. In the present work, nanocomposites of nickel cobalt sulphide (NiCoS), zinc cobalt sulphide (ZnCoS), copper cobalt sulphide (CuCoS) and nickel-zinc-copper cobalt sulphide (NiZnCuCoS) have been prepared, by hydrothermal synthesis method, for their use as the supercapacitor electrode material. The X-ray diffraction analysis, Field Emission Scanning Electron Microscopy images and UV–Visible studies suggest the formation of quantum dots (as the crystallite size is in the range of 3.5 nm–6.0 nm) in all the nanocomposites. The aim of this study is to observe the change in the electrochemical properties of the transition metal sulphides by multi-metal doping. The electrochemical measurements reveal that among all the prepared nanocomposites, highest specific capacitance (150 F g-1 at 5 mV s-1) has been exhibited by CuCoS nanocomposites (nanowires like structure) whereas highest potential window (1.7 V) and hence highest energy density (16.5 W h kg-1 at 0.1 A g-1) has been exhibited by NiZnCuCoS nanocomposites. Presently, the main goal of supercapacitors is to provide high energy density. It is observed that multi-metal sulphides (NiZnCuCoS), when used as the supercapacitor electrode, provide better electrochemical performance which may be owing to the specific nanosheets like structures as well as good synergism between Ni, Zn, Cu and Co transition metals. Hence it is observed that by multi-metal doping, the supercapacitive behaviour of transition metal sulphides has improved.
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Performance improvements of organic solar cell using dual cathode buffer layers
Sheenam Sachdeva,Jagdish Kaur,Kriti Sharma,S.K. Tripathi 한국물리학회 2018 Current Applied Physics Vol.18 No.12
The present study deals with the effect of dual cathode buffer layer (CBL) on the performance of bilayer of 4,4′- cyclohexylidenebis[N,N-bis(4-methylphenyl)benzenamine] (TAPC) and fullerene (C70)-based organic solar cell (OSC) with low donor concentration. OSC devices with CBLs have been fabricated using thermal vapor deposition technique. We report the use of lithium fluoride (LiF) and molybdenum trioxide (MoO3) as CBLs. The insertion of LiF between C70 and aluminium (Al) electrode enhances the power conversion efficiency (PCE) of device from 1.89% to 2.47% but quenching of photogenerated excitons is observed at interface of C70 and LiF layers. Incorporation of MoO3 between LiF and Al electrode further enhances PCE of device to 3.51%. This has also improved the material quality and device properties, by preventing the formation of gap states and diminishing exciton quenching.
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