Choudhary, Bharti and Chawla, Santa and K. , Jayanthi and Sood, K. N. and Singh, Sukhvir (2009) Synthesis and surface modification of ZnO:Cu nanoparticles by silica and PMMA. Current Applied Physics , 10 (3). pp. 807-812. ISSN 1567-1739

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Abstract

ZnO nanoparticles doped with Cu were synthesized by solid state reaction using different precursor routes and varying growth environment. Average crystallite size varied from 40 to 100 nm depending upon synthesis temperature, lower temperature favouring smaller particle size. Scanning electron microscope (SEM) images showed that particles synthesized at 250 °C were in the shape of nanorods but those synthesized at 900 °C had spherical shape. Luminescence emission showed marked dependence on the growth conditions varying from ultraviolet (UV) emission to green emission. For making the luminescent nanoparticles bio-compatible, a bioinorganic interface on ZnO:Cu nanoparticles was created by coating them with inert silica. Surface modification of ZnO:Cu was also done with lipophilic polymethylmethacrylate (PMMA). ZnO:Cu nanoparticles showed hexagonal wurtzite structure and the coating of silica was confirmed with the presence of two extra peaks due to silica in the XRD spectra. Thermogravimetric analysis (TGA) and FTIR spectroscopy indicated that PMMA molecules were adsorbed on the surface of ZnO:Cu nanoparticles. SEM images revealed that PMMA adsorption improved the dispersibilty of ZnO:Cu nanoparticles.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Elsevier B.V.
Uncontrolled Keywords:	ZnO nanoparticles; Surface passivation; Polymethylmethacrylate; Photoluminescence
Subjects:	Materials Science Physics
Divisions:	UNSPECIFIED
Depositing User:	Ms Neetu Chandra
Date Deposited:	18 Jul 2012 07:14
Last Modified:	18 Jul 2012 07:14
URI:	http://npl.csircentral.net/id/eprint/358

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