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Nanotechnology. 2011 May 27;22(21):215701. doi: 10.1088/0957-4484/22/21/215701. Epub 2011 Mar 30.

Integrate silver colloids with silicon nanowire arrays for surface-enhanced Raman scattering.

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  • 1School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116023, People's Republic of China.

Abstract

A facile method to prepare uniform and reproducible surface-enhanced Raman scattering (SERS) substrates is presented. Quasi-spherical silver colloids prepared by microwave heating and wafer-scale uniform silicon nanowire (SiNW) arrays fabricated via wet chemical etching were united together as SERS substrates. The novel SERS substrates displayed stronger Raman enhancement than conventional silver colloids as well as outstanding uniformity and reproducibility in our experiments. In addition, it was found that the cross section of SiNW arrays possessed stronger enhancement activity than the front side. The enhancement effects of two adjacent SiNWs (as a simplification of SiNW arrays) were evaluated by the finite difference time domain (FDTD) method.

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