Birck Nanotechnology Center, School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907, USA.
Nanotechnology. 2011 Sep 30;22(39):395704. doi: 10.1088/0957-4484/22/39/395704. Epub 2011 Sep 6.
We report surface-enhanced Raman scattering (SERS) from Ag nanoparticles decorated on thin carbon nanowalls (CNWs) grown by microwave plasma chemical vapor deposition. The Ag morphology is controlled by exposing the CNWs to oxygen plasma and through the electrodeposition process by varying the number of deposition cycles. The SERS substrates are capable of detecting low concentrations of rhodamine 6G and bovine serum albumin, showing much higher Raman enhancement than ordinary planar HOPG with Ag decoration. The major factors contributing to this behavior include: high density of Ag nanoparticles, large surface area, high surface roughness, and the underlying presence of vertically oriented CNWs. The relatively simple procedure of substrate preparation and nanoparticle decoration suggests that this is a promising approach for fabricating ultrasensitive SERS substrates for biological and chemical detection at the single-molecule level, while also enabling the study of fundamental SERS phenomena.
我们报告了在微波等离子体化学气相沉积生长的薄碳纳米墙（CNWs）上修饰的银纳米粒子的表面增强拉曼散射（SERS）。Ag 形态通过将 CNWs 暴露于氧气等离子体中和通过改变沉积循环次数的电沉积过程来控制。SERS 基底能够检测到低浓度的若丹明 6G 和牛血清白蛋白，表现出比普通平面 HOPG 与 Ag 修饰更高的拉曼增强。造成这种行为的主要因素包括：Ag 纳米粒子的高密度、大表面积、高表面粗糙度以及垂直取向的 CNWs 的存在。基底制备和纳米粒子修饰的相对简单的过程表明，这是一种很有前途的方法，可用于制造用于单分子水平的生物和化学检测的超灵敏 SERS 基底，同时也能够研究基本的 SERS 现象。
