金银合金纳米粒子的合成及其SERS研究

Preparation and Surface Enhanced Raman Spectroscopic Studies on Au-Ag Alloy Nanoparticles

采用柠檬酸三钠作为保护剂,通过水合肼还原的方法合成了不同组成的Au-Ag合金纳米粒子。UV-Vis光谱中只观察到一个位于单金属银和金之间的等离子体共振峰,表明金银已形成合金。TEM显示合成的粒子非核壳结构,金银分布均匀,合金粒径在25 nm左右。用吡啶为探针分子研究了合金的表面增强拉曼光谱(SERS),结果表明吡啶在合金表面表现出了不同于纯金和纯银的行为。

Using citrate as protector, Au-Ag alloy nanoparticles with different molar ratios were prepared by using hydrazine as the reducer, One plasmon band between that of monometallic Ag and Au observed in their UV-Vis spectra indicated the formation of Au-Ag alloy nanoparticles. TEM results showed diameters about 25 nm and homogeneous color of the alloy nanoparticles without clear core-shell contrast. By using Pyridine as the probe molecules, SERS studies were performed. The results indicated the spectra of Pyridine adsorbed on alloy is different from that of Ag and Au.