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International Journal of Photoenergy
Volume 2014, Article ID 542658, 8 pages
http://dx.doi.org/10.1155/2014/542658
Research Article

Mechanooptic Regulation of Photoconduction in Functionalized Carbon Nanotubes Decorated with Platinum

1Sección de Estudios de Posgrado e Investigación, ESIME ZAC, Instituto Politécnico Nacional, 07738 México, DF, Mexico
2Departamento de Ingeniería Metalurgia y Materiales, ESIQIE, Instituto Politécnico Nacional, 07300 México, DF, Mexico
3Instituto Politécnico Nacional, ESIQIE, 07738 México, DF, Mexico
4Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada Unidad Querétaro, Instituto Politécnico Nacional, 76090 Santiago de Querétaro, QRO, Mexico
5Departamento de Física y Matemáticas, Universidad Iberoamericana, Prolongación Paseo de la Reforma 880, Lomas de Santa Fe, 01219 México, DF, Mexico

Received 6 February 2014; Accepted 8 April 2014; Published 9 June 2014

Academic Editor: Xie Quan

Copyright © 2014 C. Mercado-Zúñiga 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

The observation of photoconduction and nonlinear optical absorption on functionalized multiwall carbon nanotubes decorated with platinum is reported. The samples were prepared by a chemical vapor deposition method. The electrical conductivity of the carbon nanotubes seems to be decreased by the functionalization process; but this property is strongly enhanced after the incorporation of platinum particles. Nonresonant photoconductive experiments at 532 nm and 445 nm wavelengths allow us to detect a selective participation of the platinum to the photoelectrical response. A mechanooptic effect based on Fresnel reflection was obtained through a photoconductive modulation induced by the rotation of a silica substrate where the samples were deposited as a thin film. A two-photon absorption process was identified as the main physical mechanism responsible for the nonlinear optical absorption. We consider that important changes in the nonlinear photon interactions with carbon nanotubes can be related to the population losses derived from phonons and the detuning of the frequency originated by functionalization.