Vaishnavi, T.S. and Haridoss, Prathap and Vijayan, C. (2008) Optical properties of zinc oxide nanocrystals embedded in mesoporous silica. Materials Letters, 62 (10-11). pp. 1649-1651. ISSN 0167-577X
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This paper reports on the synthesis and characterization of a nanocomposite incorporating zinc oxide (ZnO) in mesoporous silica (MPS), a host medium for stabilizing the nanoparticles. The composite is prepared using a chemical route involving in-situ synthesis of ZnO in pores of host material in an acidic medium. The samples are characterized by X-ray Diffraction (XRD), Energy Dispersive Spectroscopy (EDS), high resolution Transmission Electron Microscopy (TEM), UV-Vis absorption and Photoluminescent (PL) spectroscopy. The UV-Vis spectra and the PL spectra of the composite show blue shift in the position of the absorption band, indicating quantum confinement effect. On excitation at 320 nm, the samples exhibit a relatively narrow UV fluorescence emission band around 350 nm and an exciton recombination luminescence peak around 405 nm. The generally observed defect-related green emission is not observed, possibly being too low in intensity when compared to UV/blue emission. (c) 2007 Elsevier B.V. All rights reserved.
|Subjects:||Physical Science > Nanophysics|
Physical Science > Nano objects
Material Science > Nanochemistry
Material Science > Nanostructured materials
|Divisions:||Faculty of Engineering, Science and Mathematics > School of Physics|
Faculty of Engineering, Science and Mathematics > School of Chemistry
|Deposited On:||02 Sep 2009 10:27|
|Last Modified:||02 Sep 2009 10:27|
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