School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116023, People's Republic of China.
Nanotechnology. 2011 May 27;22(21):215701. doi: 10.1088/0957-4484/22/21/215701. Epub 2011 Mar 30.
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.
本文提出了一种制备均匀且重现性良好的表面增强拉曼散射(SERS)基底的简易方法。通过微波加热制备的类球形银胶体和通过湿化学刻蚀制备的晶圆级均匀硅纳米线(SiNW)阵列被结合在一起作为 SERS 基底。在我们的实验中，新型 SERS 基底表现出比传统银胶体更强的拉曼增强效果，以及出色的均匀性和重现性。此外，还发现 SiNW 阵列的横截面比前表面具有更强的增强活性。通过时域有限差分(FDTD)方法评估了两个相邻 SiNW(作为 SiNW 阵列的简化)的增强效果。
