Department of Chemical Engineering, National Chung Hsing University, Taichung, Taiwan.
J Colloid Interface Sci. 2011 Aug 1;360(1):305-8. doi: 10.1016/j.jcis.2011.04.005. Epub 2011 Apr 14.
Femtosecond laser was employed to fabricate nanostructured Ag surface for surface-enhanced Raman scattering (SERS) application. The prepared nanostructured Ag surface was characterized by field emission scanning electron microscopy (FESEM), atomic force microscopy (AFM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The FESEM images demonstrate the formation of nanostructure-covered femtosecond laser-induced periodic surface structure, also termed as ripples, on the Ag surface. The AFM images indicate that the surface roughness of the produced nanostructured Ag substrate is larger than the untreated Ag substrate. The XRD and XPS of the nanostructured Ag surface fabricated by femtosecond laser show a face centered cubic phase of metallic Ag and no impurities of Ag oxide species. The application of the produced nanostructured Ag surface in SERS was investigated by using rhodamine 6G (R6G) as a reference chemical. The SERS intensity of R6G in aqueous solution at the prepared nanostructured Ag surface is 15 times greater than that of an untreated Ag substrate. The Raman intensities vary linearly with the concentrations of R6G in the range of 10(-8)-10(-4)M. The present methodology demonstrates that the nanostructured Ag surface fabricated by femtosecond laser is potential for qualification and quantification of low concentration molecules.
飞秒激光被用于制造用于表面增强拉曼散射（SERS）应用的纳米结构 Ag 表面。所制备的纳米结构 Ag 表面通过场发射扫描电子显微镜（FESEM）、原子力显微镜（AFM）、X 射线衍射（XRD）和 X 射线光电子能谱（XPS）进行了表征。FESEM 图像表明，Ag 表面上形成了纳米结构覆盖的飞秒激光诱导周期性表面结构，也称为波纹。AFM 图像表明，所产生的纳米结构 Ag 基底的表面粗糙度大于未处理的 Ag 基底。飞秒激光制造的纳米结构 Ag 表面的 XRD 和 XPS 显示出金属 Ag 的面心立方相，没有 Ag 氧化物物种的杂质。通过使用罗丹明 6G（R6G）作为参考化学物质，研究了所制备的纳米结构 Ag 表面在 SERS 中的应用。在制备的纳米结构 Ag 表面上，水溶液中 R6G 的 SERS 强度比未处理的 Ag 基底高 15 倍。R6G 的拉曼强度随浓度在 10(-8)-10(-4)M 范围内呈线性变化。本方法证明，飞秒激光制造的纳米结构 Ag 表面有潜力用于定性和定量分析低浓度分子。
