Low-concentration organic molecules detection via surface-enhanced Raman spectroscopy effect using Ag nanoparticles-coated silicon nanowire arrays

Truc Quynh Ngan Luong, Tuan Anh Cao and Tran Cao Dao

Abstract

In this report we present the initial results of the use of Ag nanoparticles (AgNPs)-coated silicon nanowire (SiNW) arrays for detection of organic molecules using the surface-enhanced Raman spectroscopy (SERS) effect. The SiNW arrays were prepared by metal-assisted chemical etching (MACE) and the AgNPs were deposited on the SiNW arrays through immersion of SiNW arrays in the HF/AgNO₃ solution. Specifically, results showed that very low concentration (about 10⁻⁷–10⁻⁵ mol l⁻¹) of malachite green dropped on the surface of the AgNPs-coated SiNW arrays can be detected