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Proceedings Paper

Assembly of gold nanostructured films templated by colloidal crystals and use in surface-enhanced Raman spectroscopy
Author(s): Peter M. Tessier; Kate Ong; Steven D. Christesen; Abraham M. Lenhoff; Eric W. Kaler; Orlin D. Velev
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Paper Abstract

Surface-enhanced Raman spectroscopy (SERS) is a highly sensitive technique for quantifying trace amounts of analyte adsorbed at a roughened metal surface. Many techniques, including electrochemical etching and e-beam lithography, have been used previously to produce roughened metallic surfaces. In this work we demonstrate how novel gold nanostructured films, which are simply fabricated using gold nanoparticles and latex microspheres, can be used as highly sensitive SERS substrates. The gold films are templated by 3D colloidal crystals and display long ranged ordered regions. Since the films are porous on two length scales and, therefore, possess a high surface area, we have investigated their SERS activity using sodium cyanide as a model compound. We have integrated these substrates into a flow chamber and demonstrated the quantitative detection of sodium cyanide form 5 to 500 ppb. Our results also reveal that cyanide detection can be significantly enhanced by lowering the pH after cyanide adsorption, likely indicating a conformational change of the bound cyanide. This study illustrates how novel materials formed by simple wet chemistry techniques can be used in practical devices for the detection of chemical agents, and, more generally, illustrates how material design and spectroscopic evaluation can be rapidly integrated.

Paper Details

Date Published: 22 February 2002
PDF: 12 pages
Proc. SPIE 4577, Vibrational Spectroscopy-based Sensor Systems, (22 February 2002); doi: 10.1117/12.455751
Show Author Affiliations
Peter M. Tessier, Univ. of Delaware (United States)
Kate Ong, U.S. Army Edgewood Chemical Biological Ctr. (United States)
Steven D. Christesen, U.S. Army Edgewood Chemical Biological Ctr. (United States)
Abraham M. Lenhoff, Univ. of Delaware (United States)
Eric W. Kaler, Univ. of Delaware (United States)
Orlin D. Velev, Univ. of Delaware (United States)

Published in SPIE Proceedings Vol. 4577:
Vibrational Spectroscopy-based Sensor Systems
Steven D. Christesen; Arthur J. Sedlacek III, Editor(s)

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