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Journal of Nanomaterials
Volume 2008, Article ID 473791, 10 pages
http://dx.doi.org/10.1155/2008/473791
Research Article

Silver Nanoparticles Confined in SBA-15 Mesoporous Silica and the Application as a Sensor for Detecting Hydrogen Peroxide

State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China

Received 12 September 2007; Revised 31 January 2008; Accepted 24 March 2008

Academic Editor: Michael Wong

Copyright © 2008 Dong-Hai Lin 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

Silver nanoparticles within the pore channels of selectively grafted mesoporous silica SBA-15 were synthesized. Silanols on the external surface of as-SBA-15 were first capped by – groups. After removal of the template of capped SBA-15 by calcination, silanols on the internal surface of SBA-15 were modified by 3-aminopropyltrimethoxysilane (APTMS), and then formaldehyde was grafted by amino groups of APTMS, and further Ag SBA-15). High-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), Fourier transformation infrared spectroscopy (FTIR), nitrogen adsorption/desorption isotherms, and UV-vis spectra confirm that the silver nanoparticles have been confined inside the channels of SBA-15. In addition, the SBA-15 modified electrode ( SBA-15/GC) exhibited an excellent electrocatalytic activity toward the reduction of hydrogen peroxide ( ). The proposed sensor exhibits a linear range of 48.5  M–0.97 M with a detection limit of 12  M ( ) and analytical time of 10 seconds per sample.