Surface-enhanced Raman scattering on nanoporous Au
- 31 July 2006
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 89 (5), 053102
- https://doi.org/10.1063/1.2260828
Abstract
Colloidal solutions of metal nanoparticles are currently among the most studied substrates for sensors based on surface-enhanced Raman scattering (SERS). However, such substrates often suffer from not being cost-effective, reusable, or stable. Here, we develop nanoporous Au as a highly active, tunable, stable, biocompatible, and reusable SERS substrate. Nanoporous Au is prepared by a facile process of free corrosion of AgAu alloys followed by annealing. Results show that nanofoams with average pore widths of exhibit the largest SERS signal for excitation. This is attributed to the electromagnetic SERS enhancement mechanism with additional field localization within pores.
Keywords
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