Abstract
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.
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