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Journal of Nanomaterials
Volume 2016, Article ID 7914189, 6 pages
http://dx.doi.org/10.1155/2016/7914189
Research Article

Photoelectrochemical Activity of Graphene Supported Titanium Dioxide

1Instituto de Química y Bioquímica, Facultad de Ciencias, Universidad de Valparaíso, Av. Gran Bretaña 1111, Valparaíso, Chile
2Instituto de Física, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Macul, Santiago, Chile
3Departamento de Física, Universidad Técnica Federico Santa María, Avenida España 1680, Valparaíso, Chile

Received 10 April 2016; Revised 4 August 2016; Accepted 22 September 2016

Academic Editor: Xuping Sun

Copyright © 2016 Rodrigo A. Segura 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.

Abstract

Thin TiO2 layers grown over few-layers graphene were prepared in order to evaluate the photoinduced chemical response of this composite. Graphene was grown over copper foils by decomposition of acetylene in a standard chemical vapor deposition apparatus. Graphene was subsequently transferred to a silicon substrate, on which the titanium dioxide was grown to form a TiO2/FLG/SiO2/Si composite. The formation of each layered material was verified by Raman spectroscopy and the morphology was characterized by scanning electron microscopy. The photoelectrochemical evaluation of the resulting composite, using it as a photoanode, was accomplished with a potentiostat, a solar simulator, and a three-electrode configuration. The electrochemical response indicates that the new composite preserves the average photoactive properties of the base material and at the same time shows a singular transient response where explicit benefits seem to be derived from the FLG/TiO2 combination.