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Silicon-based surface plasmon resonance combined with surface-enhanced Raman scattering for chemical sensing

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5 Author(s)
Nikitin, P.I. ; General Physics Institute of the Russian Academy of Sciences, 38 Vavilov Street, 117942 Moscow, Russia, CIS ; Beloglazov, A.A. ; Valeiko, M.V. ; Creighton, J.A.
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A Si-based surface plasmon resonance (SPR) technique has been successfully applied to NO2 sensing at ppm level, with estimated detectability at less than 100 ppb. Surface-enhanced Raman scattering (SERS) has been used in this scheme as an inherent additional data acquisition channel capable of providing spectroscopic selectivity and amplified sensitivity. The behavior of both the SERS spectrum and the SPR-induced photosignal produced by Au-on-Si grating structures coated with thin 18-crown-6 metal-free phthalocyanine films was simultaneously recorded for exposure of the films to 10 ppm of NO2 in air and its reversal in clean air. Both responses have been found to be reversible. The combination of Si-based SPR and SERS looks promising for thin-film and surface explorations, both in fundamental and sensor applications. © 1997 American Institute of Physics.

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Review of Scientific Instruments  (Volume:68 ,  Issue: 6 )