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Advances in Materials Science and Engineering
Volume 2015, Article ID 934587, 22 pages
Review Article

Photocatalysis and Bandgap Engineering Using ZnO Nanocomposites

1Alamoudi Water Research Chair, King Saud University, P.O. Box 2460, 11451 Riyadh, Saudi Arabia
2Centre for Micro & Nano Devices, Department of Physics, COMSATS Institute of Information Technology, 44000 Islamabad, Pakistan

Received 20 August 2015; Revised 12 October 2015; Accepted 13 October 2015

Academic Editor: Filippo Giannazzo

Copyright © 2015 Muhammad Ali Johar et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Nanocomposites have a great potential to work as efficient, multifunctional materials for energy conversion and photoelectrochemical reactions. Nanocomposites may reveal more improved photocatalysis by implying the improvements of their electronic and structural properties than pure photocatalyst. This paper presents the recent work carried out on photoelectrochemical reactions using the composite materials of ZnO with CdS, ZnO with SnO2, ZnO with TiO2, ZnO with Ag2S, and ZnO with graphene and graphene oxide. The photocatalytic efficiency mainly depends upon the light harvesting span of a material, lifetime of photogenerated electron-hole pair, and reactive sites available in the photocatalyst. We reviewed the UV-Vis absorption spectrum of nanocomposite and photodegradation reported by the same material and how photodegradation depends upon the factors described above. Finally the improvement in the absorption band edge of nanocomposite material is discussed.