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

摘要

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.