Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 508, Issue 2, Pages 587-591Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2010.08.128
Keywords
Semiconductors; Chemical synthesis; Catalysis; Luminescence
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Funding
- Council of Scientific and Industrial Research (CSIR), New Delhi, India [01(2031)/06/EMR-II]
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ZnO and Ag-ZnO (0.5 at.%) nanocrystals have been prepared by sonochemical method and characterized by X-ray diffraction, energy dispersive X-ray analysis, scanning electron micrographs, UV-visible diffuse reflectance spectra, photoluminescence spectra, and impedance spectra. Ag-doping sharpens the band gap absorption, enhances the visible emission and increases the charge transfer resistance. The synthesized ZnO photocatalytically detoxifies cyanide in alkaline medium. The bactericidal activities of the prepared oxides, tested with Escherichia coli, are larger than that of commercial ZnO nanoparticles (Sigma-Aldrich). While the antibacterial efficiencies of the prepared ZnO and Ag-ZnO do not differ significantly, their photocatalytic activities to degrade dyes, tested with methyl orange, rhodamine B. and methylene blue, could not be generalized; photocatalysis is also substrate specific. Further, agglomeration of the nanoparticles in dye solution may lead to such results. (c) 2010 Elsevier B.V. All rights reserved.
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