Preparation of silicon surface pyramid arrays and modification of thin gold film for surface-enhanced Raman scattering

Abstract

Mon crystalline silicon surface microstructure is prepared by 15wt% K3PO4 and 3wt% K2SiO3 solutions at 90 °C for 42 min. The monocrystalline silicon surface microstructure obtained high coverage, uniformity and low reflectivity. The surface-enhanced Raman scattering (SERS) substrate based on silicon nanoporous pyramid arrays/gold film (Si/Au) is prepared by ion sputtering. Methylene blue (1 × 10−5 mol/L) is used as a probe molecule, and the enhancement effect of Si/Au SERS substrate is investigated. The results show that silicon surface pyramid arrays have high Raman enhancement effect when deposition time is 5min. Furthermore, the applied of the Si/Au SERS substrate in Raman detection of melamine (1 × 10−3 mol/L), the Raman characteristic peaks of melamine is enhanced obviously. These results indicated that the Si/Au SERS substrate had potential application value in food safety and the detection of chemical dyes and contraband.