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RISS 인기검색어
- 검색키워드
- 저자 : P. D. SAHARE (검색결과 2 건)
- 무료
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EFFECTS OF ANNEALING ON THE SURFACE DEFECTS OF ZINC OXIDE NANOPARTICLES
SURENDER KUMAR,P. D. SAHARE 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2012 NANO Vol.7 No.3
ZnO nanoparticles have been prepared by wet chemical method. The properties of the synthesized nanostructures are studied using X-ray di®raction, Transmission Electron Microscopy (TEM), Photoluminescence (PL), Ultraviolet-Visible absorption, Laser Raman and Fourier transform Infrared (FTIR) spectroscopy. The thermal decomposition is analyzed by Thermogravimetric (TG) and Di®erential Thermal Analysis (DTA). The in°uence of annealing on structural and optical properties of ZnO nanoparticles has been systematically investigated. The PL results demonstrated that the visible emission at 565 nm is associated with the combination of oxygen vacancies and OH group attached at the surface of ZnO nanoparticles. OH group is lessened from the surface of ZnO nanoparticles with annealing temperature and a blue-shift in visible emission peak is observed at 800?C annealing temperature.
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PHOTOCATALYTIC ACTIVITY OF BISMUTH VANADATE FOR THE DEGRADATION OF ORGANIC COMPOUNDS
SURENDER KUMAR,P. D. SAHARE 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2013 NANO Vol.8 No.1
We synthesized the nanoparticles of Bi4V2O11 with particle size less than 30 nm by combustion method and they were found to be in monoclinic phase (i.e., α-phase), confirmed by X-ray diffraction, Raman and Fourier transform Infrared spectroscopy. Morphology of the α-Bi4V2O11 was analyzed by transmission electron microscopy and scanning electron microscopy techniques. Photocatalytic activity of α-Bi4V2O11 in degradation of common organic dyes, such as, Rhodamine B (Rh B) and Methylene Blue (MB) was investigated under UV irradiation. Furthermore, γ-Bi4V2O11 was obtained by post annealing treatment of α-Bi4V2O11 to investigate the phase transition and size dependent effects on photocatalytic activity. α-Bi4V2O11 has shown better photocatalytic activity compared to γ-Bi4V2O11 which is attributed to its smaller particle size enhancing its surface to volume ratio and being in a different phase. BET measurement is also performed in order to observe the effect of surface area on photocatalytic activity. Complete removal of aqueous Rh B dye was realized after UV light irradiation for 45 min with α-Bi4V2O11 as the photocatalyst.
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