内部具有可移动金核的中空银纳米颗粒的制备、表征及其表面增强拉曼效应

Preparation and Characterization of Hollow Ag Nanoparticles with Movable Au Cores Inside and Their Application to Surface-enhanced Raman Scattering

采用振荡法和种子生长技术制备出核壳结构的Au@SiO2纳米颗粒及夹层结构的Au@SiO2@Ag纳米颗粒,用HF将Au@SiO2@Ag NPs夹层的SiO2溶解,得到内部带有粒径为30 nm的可移动金核、壳层厚度约为30 nm的中空银纳米颗粒(Au@air@Ag NPs).用扫描电子显微镜和透射电子显微镜对所得到的纳米微球的形貌进行了表征,并以罗丹明B为探针分子研究了Au@air@Ag纳米颗粒的表面增强拉曼(SERS)效应,发现Au@air@Ag纳米颗粒是一种可应用于SERS的理想材料.

Core-shell structure of Au@SiO2 nanoparticles and silver coated Au@SiO2 nanoparticles （Au@ SiO2@ Ag NPs） were prepared by a seed-mediated growth technique under shaking. Hollow Ag nanoparticles with a shell thickness of 30 nm and with movable Au cores of 30 nm diameter inside（ Au@ air@ Ag NPs） were further obtained by dissolving silica shell within Au@ SiO2@ Ag NPs by HF. The morphologies of those obtained nanoparticles were characterized by scanning electron microscopy（SEM） and transmission electron microscopy（TEM）. The application of the as-prepared Au@ air@ Ag substrates in surface-enhanced Raman scattering（SERS） was investigated with Rhodamine B as a probe molecule. It was found that even though very low concentration of Rhodamine B adsorbed on the hollow nanoparticles showed a strong SERS effect. The results indicate that the Au@ air@ Ag NPs were ideal materials applied in SERS.