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Journal of Nanomaterials
Volume 2015, Article ID 260397, 7 pages
http://dx.doi.org/10.1155/2015/260397
Research Article

Synthesis of CdS Nanocrystals by Employing the By-Products of the Anaerobic Respiratory Process of Desulfovibrio alaskensis 6SR Bacteria

1Departamento de Materiales, Universidad Autónoma Metropolitana Azcapotzalco, Avenida San Pablo 180, Colonia Reynosa Tamaulipas, 02200 México, DF, Mexico
2División de Ingeniería Química y Bioquímica, Tecnológico de Estudios Superiores de Ecatepec, Avenida Tecnológico S/N, Colonia Valle de Anáhuac, 55210 Ecatepec de Morelos, MEX, Mexico
3Departamento de Ingeniería Agrícola, DICIVA, Universidad de Guanajuato, Campus Irapuato-Salamanca, Ex Hacienda el Copal km 9, Carretera Irapuato-Silao, 36500 Irapuato, GTO, Mexico
4CICATA-IPN, Calzada Legaria No. 694, Colonia Irrigación, 11500 México, DF, Mexico
5Departamento de Física, Centro de Investigación y de Estudios Avanzados del IPN, Apartado Postal 14-740, 07000 México, DF, Mexico

Received 9 April 2015; Revised 2 June 2015; Accepted 9 June 2015

Academic Editor: Chuanbao Cao

Copyright © 2015 L. G. Rangel-Chávez 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

A novel methodology for the direct synthesis of CdS nanoparticles, using a biological agent that avoids the extracellular processing, and the results of the characterization of CdS nanocrystals are presented. The by-products of the anaerobic respiratory process of Desulfovibrio alaskensis 6SR along with aqueous solutions of Cd salts were successfully employed to produce CdS nanocrystals with mixed cubic and hexagonal phases. Nanocrystal size has a narrow size distribution with little dependence on the Cd concentration. Both the presence of the crystallographic cubic phase and the crystalline order decrease as Cd concentration increases. The band gap values obtained from optical transmission measurements are lower than those of the bulk crystal. Raman spectroscopy characterization agrees with electron transmission microscopy images and X-ray diffraction results indicating that the method promotes the formation of high structural quality nanocrystals when low concentrations of the Cd salt are used.