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Proceedings Paper

Nanowire-based surface-enhanced Raman spectroscopy (SERS) for chemical warfare simulants
Author(s): J. A. Hoffmann; J. A. Miragliotta; J. Wang; P. Tyagi; T. Maddanimath; D. H. Gracias; S. J. Papadakis
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Paper Abstract

Hand-held instruments capable of spectroscopic identification of chemical warfare agents (CWA) would find extensive use in the field. Because CWA can be toxic at very low concentrations compared to typical background levels of commonly-used compounds (flame retardants, pesticides) that are chemically similar, spectroscopic measurements have the potential to reduce false alarms by distinguishing between dangerous and benign compounds. Unfortunately, most true spectroscopic instruments (infrared spectrometers, mass spectrometers, and gas chromatograph-mass spectrometers) are bench-top instruments. Surface-acoustic wave (SAW) sensors are commercially available in hand-held form, but rely on a handful of functionalized surfaces to achieve specificity. Here, we consider the potential for a hand-held device based on surface enhanced Raman scattering (SERS) using templated nanowires as enhancing substrates. We examine the magnitude of enhancement generated by the nanowires and the specificity achieved in measurements of a range of CWA simulants. We predict the ultimate sensitivity of a device based on a nanowire-based SERS core to be 1-2 orders of magnitude greater than a comparable SAW system, with a detection limit of approximately 0.01 mg m-3.

Paper Details

Date Published: 3 May 2012
PDF: 9 pages
Proc. SPIE 8373, Micro- and Nanotechnology Sensors, Systems, and Applications IV, 837323 (3 May 2012); doi: 10.1117/12.920777
Show Author Affiliations
J. A. Hoffmann, The Johns Hopkins Univ. Applied Physics Lab. (United States)
J. A. Miragliotta, The Johns Hopkins Univ. Applied Physics Lab. (United States)
J. Wang, Johns Hopkins Univ. (United States)
P. Tyagi, Johns Hopkins Univ. (United States)
T. Maddanimath, Johns Hopkins Univ. (United States)
D. H. Gracias, Johns Hopkins Univ. (United States)
S. J. Papadakis, The Johns Hopkins Univ. Applied Physics Lab. (United States)

Published in SPIE Proceedings Vol. 8373:
Micro- and Nanotechnology Sensors, Systems, and Applications IV
Thomas George; M. Saif Islam; Achyut Dutta, Editor(s)

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