硅基银枝晶的湿化学法制备及其在SERS检测中的应用（英文）

A Simple Wet-Chemical Route for the Preparation of Silver Dendrites on Commercial Silicon Wafer and Their Application in SERS Detection

设计并构建结构多样的银枝晶一直被认为是一种实现表面增强拉曼散射(SERS)信号放大的合理途径。本文报道了一种简单的湿化学方法,通过快速混合硝酸银和氢氟酸水溶液,进而实现了硅片表面高密度银枝晶的快速制备。由于Si-H表面具有一定的弱还原性,随后导致了银离子的还原,并最终形成了具有良好SERS增强特性的银枝晶结构。该方法生产速率快,重现性好,产率高,其尺寸通常为微米级,且枝晶表面无任何有机污染物。EDS分析进一步证实了所制备的枝晶结构为单质银属性。此外,详尽的研究表明所制备的银枝晶结构其形貌与具体的反应参数如氢氟酸浓度、硝酸银浓度以及反应时间等息息相关。重要的是,利用成功制备的该枝晶结构实现了苏丹Ⅰ、苏丹Ⅱ和苏丹Ⅲ的快速分析检测。

Design and preparation of various rational silver micro-nanostructures has been recognized as a promising solution for the surface-enhanced Raman scattering(SERS) signal amplification. Here, a simple wet-chemical method was reported for the synthesis of high-density Ag dendrites structures on silicon wafer by rapidly mixing silver nitrate and hydrofluoric acid aqueous solutions. The reductive Si-H surfaces are oxidized while silver ions are reduced, yielding a final Ag dendrites structure that offers an excellent SERS enhancement. The EDS measurements confirm the metallic nature of the formed Ag dendrites. Researches also show that the pure and low-cost Ag dendrites are about several micrometers in size and can be rapidly and reproducibly produced in high yield. There are no organic contaminants on the surface of the resulting dendrites structure. Additionally, the influence of experimental parameters on the morphology of dendrites was also investigated, such as hydrofluoric acid concentration, silver nitrate concentration, and the reaction time. Importantly, the fabricated Ag dendrites substrates can be used for accurate and reliable determination of Sudan Ⅰ, Sudan Ⅱ, and Sudan Ⅲ.