多孔硅上银纳米粒薄膜的制备及其表面增强红外光谱

通过简便的化学沉积法在多孔硅上制备银纳米粒薄膜用于表面增强红外光谱检测。通过Ag⁺与多孔硅表面的SiHx发生氧化还原反应将银纳米粒子沉积在多孔硅表面。红外探针分子溶解于无水乙醇中进而被均匀分散在多孔硅表面，实验结果显示：对氨基苯硫酚、对氨基苯甲酸和对氟苯硫酚3个探针分子的红外峰分别最大增强了10、85和21倍。银纳米粒的大小和形状等物理特性、探针分子是否有与银表面进行强结合的基团和芳烃结构、以及表面选律等因素影响表面增强红外的吸收效应。

Facile Fabrication of Silver Nanoparticulate Films on Porous Silicon for Surface-Enhanced Infrared Absorption Spectroscopy

A facile chemical deposition method was developed to fabricate silver nanoparticulate films on porous silicon for surface-enhanced infrared absorption (SEIRA) spectroscopy. The silver nanoparticulate films were deposited on freshly anodized porous silicon through a spontaneous redox reaction between Ag⁺ ions and surface SiHx species. Probe molecules dissolved in ethanol were homogeneously spread on the porous membrane area with clear boundaries. The results show that three probe molecules of p-aminothiophenol, p-nitrobenzoic acid, and p-fluorothiophenol are enhanced on silver nanoparticle deposited porous silicon as 10, 85 and 21 times high as on bare porous silicon respectively. Several factors such as the particle size and shape, the probe molecular binding groups and aromatic structures, and surface selection rules are considered for contribution to the SEIRA effect.