摘要
采用自组装技术在硅基底上进行金银纳米粒子的复合组装,通过控制组装溶液中金溶胶和银溶胶的体积比进而控制基底上金银纳米粒子的密度。采用紫外-可见漫反射和SEM对复合基底进行了表征,结果显示硅基底上金银同时存在且呈亚单层均匀分布。以硫氰根为探针分子研究了纯金、纯银以及混合组装时复合基底的SERS效应。通过一系列的校正表明,在金银同时存在的复合基底上,硫氰根的三键伸缩振动频率和特征峰的形状相对于单组分基底而言都接近于在银基底上的特征谱峰。对实验结果进行分析后认为,当金银同时组装在基底上时,金和银之间有一定的耦合作用,这种耦合作用最终导致金的SERS效应逐渐趋向于银。
Ag and Au nanoparticles were self-assembled on a silicon substrate simultaneously. The density of Ag and Au nanoparticles was controlled by changing the volume ratio of Au to Ag colloids. The substrate was characterized by UV-Vis diffuse reflectance and SEM, and the results indicated that Ag and Au nanoparticles were dispersed on the substrate with mono/submono layers. Using SCN- as a probing molecule, surface enhanced Raman spectroscopic （SERS） effect was investigated on pure Au, pure Ag and Au-Ag mixed nanoparticle surfaces. After a series of calibration, the results revealed that the SERS spectral features of SCN- from the mixture system were similar to those from the pure Ag nanoparticles, indicating the coupling effect between the Ag and Au nanoparticles, which results in the property of Au inclining to Ag.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2009年第9期2434-2437,共4页
Spectroscopy and Spectral Analysis
基金
国家自然科学基金项目(20573076
20503019)
江苏省自然科学基金项目(BK2005032)
教育部博士点基金项目(20050285019)资助
关键词
金银复合基底
自组装
表面增强拉曼光谱
耦合作用
SCN
Au/Ag complex substrate~ Self-assembly
Surface enhanced Raman spectroscopy
Coupling effect
SCN-
