纳米多孔银的制备及其表面增强拉曼散射特性研究

表面增强拉曼散射(SERS)因其具有高达单分子检测量级的灵敏度,在医学诊断、食品安全、环境监测等领域有着较大的应用前景。制备具有高密度“热点”的SERS基底是这项技术走向实际应用的关键。双连续结构的纳米多孔金属由于近邻纳米结构之间的耦合效应,所以具有很好的SERS增强特性。采用溅射方法制备了银锌合金前驱体,采用自由脱合金工艺和电化学脱合金工艺制备了具有纳米多孔结构的银基底,通过调制脱合金参数,获得了具有高增强因子的SERS基底。所制备的纳米多孔银基底对结晶紫的检测极限达到了10^-12 mol/L,可应用于超灵敏检测。

Preparation of nanoporous silver and research on its surface-enhanced Raman scattering properties

Surface-enhanced Raman scattering (SERS) has great application prospects in the fields of medical diagnosis, food safety, and environmental monitoring because of its sensitivity as high as single-molecule detection. Preparation of SERS substrates with high-density "hot spots" is the key to the practical applications. Nanoporous metals with bicontinuous structures have excellent SERS enhancement properties due to the coupling effect between neighboring nanostructures. Ag-Zn alloy precursors were prepared by sputtering method, and silver substrates with nanoporous structure were prepared by free dealloying process and electrochemical dealloying process. Through the modulation of dealloying parameters, SERS substrates with high enhancement factor were obtained. The detection limit of crystal violet reached 10^-12mol/L, which could be used for ultrasensitive detection.