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International Journal of Photoenergy
Volume 2013, Article ID 178017, 9 pages
http://dx.doi.org/10.1155/2013/178017
Research Article

Optical and Electrical Properties of Thin Films of CuS Nanodisks Ensembles Annealed in a Vacuum and Their Photocatalytic Activity

1Facultad de Química, Materiales Universidad Autónoma de Querétaro, 76010 Querétaro, QRO, Mexico
2Centro de Investigación en Materiales Avanzados S.C., Miguel de Cervantes 120, 31109 Chihuahua, CHIH, Mexico
3Departmento de Física, CINVESTAV, Apartado, Postal 14-740, 07000 México, DF, Mexico
4Cinvestav-IPN, Unidad Querétaro, Apartado Postal 1-798, 76230 Querétaro, QRO, Mexico

Received 25 May 2013; Revised 9 August 2013; Accepted 12 August 2013

Academic Editor: Niyaz Mohammad Mahmoodi

Copyright © 2013 J. Santos Cruz 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

Effects on the optical, electrical, and photocatalytic properties of undoped CuS thin films nanodisks vacuum annealed at different temperatures were investigated. The chemical bath prepared CuS thin films were obtained at 40°C on glass substrates. The grain size of ?nm was computed directly from high-resolution transmission electron microscopy (HRTEM) images. The electrical properties were measured by means of both Hall effect at room temperature and dark resistivity as a function of the absolute temperature 100–330?K. The activation energy values were calculated as 0.007, 0.013, and 0.013?eV for 100, 150, and 200°C, respectively. The energy band gap of the films varied in the range of 1.98 up to 2.34?eV. The photocatalytic activity of the CuS thin film was evaluated by employing the degradation of aqueous methylene blue solution in the presence of hydrogen peroxide. The CuS sample thin film annealed in vacuum at 150°C exhibited the highest photocatalytic activity in presence of hydrogen peroxide.