Journal
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
Volume 44, Issue 7-8, Pages 1742-1746Publisher
ELSEVIER
DOI: 10.1016/j.physe.2011.11.019
Keywords
BiVO4; Nanoparticle; Ball milling; Band gap; Dielectric properties
Funding
- University Grants commission, The Govt. of India
- Department of Science and Technology, Govt. of India
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Optical and dielectric properties of BiVO4 nanocrystals with different particle sizes have been investigated. BiVO4 nanocrystals with different particle sizes were synthesized through a solid-state reaction method followed by mechanical ball milling for different time durations. The samples were characterized by X-ray diffraction, UV-Vis spectroscopy, field emission scanning electron microscopy, transmission electron microscopy and photoluminescence spectroscopy. Direct and indirect band gap energies were found to vary in the range 4.04-4.16 eV and 3.51-3.67 eV respectively, for different particle sizes. The band gap energies are higher with respect to their values in the bulk BiVO4 due to quantum confinement effects. Dielectric properties of the BiVO4 nanocrystals were investigated and it was found that the dielectric constant increased from 32 to 41 for the reduction of particle size from 29 to 7 nm. (C) 2011 Elsevier B.V. All rights reserved.
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