Surface plasmon resonance and surface-enhanced Raman scattering activity of SiO2-Au core-cap nanostructure arrays
Surface plasmon resonance and surface-enhanced Raman scattering activity of SiO2-Au core-cap nanostructure arrays
复制标题
SiO2-Au核-帽纳米结构阵列的表面等离子体共振和表面增强拉曼散射活性
DOI：
10.1007/s00339-014-8634-6
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发表时间：
2014
影响因子：
2.7
通讯作者：
Feng Jie
中科院分区：
文献类型：
--
作者：
Xiao Guina;Man Shiqing;Shi Wangzhou;Feng Jie
采用浸涂法结合湿化学还原法制备了SiO2-Au核帽结构纳米阵列。利用扫描电子显微镜、X射线衍射仪和紫外-可见分光光度计对样品的表面形貌、结构和光学性能进行了表征。以亮氨酸为探针分子，研究了SiO2-Au核帽纳米结构阵列基底的表面增强拉曼散射（Sers）活性。讨论了表面等离子体共振峰与表面增强拉曼散射效应的关系。成功地获得了高质量、稳定、重复性好的亮氨酸表面Sers光谱。当最大SPR峰与激发波长匹配时，基底的Sers增强最大。此外，还选择了六种不同的荧光染料作为探针分子。结果表明，该基质对这些荧光染料具有良好的拉曼增强和高效的荧光猝灭特性。
SiO2–Au core-cap nanostructure arrays were prepared by dip-coating technique combined with wet chemical reduction method. The surface morphologies, structures, and optical properties of the obtained samples were characterized by scanning electron microscopy, X-ray diffraction, and ultraviolet–visible spectrophotometer, respectively. The surface-enhanced Raman scattering (SERS) activity of SiO2–Au core-cap nanostructure arrays substrates was investigated using leucine as probe molecule. And the relationship between the SERS effect and the surface plasmon resonance (SPR) peaks was discussed. High-quality, stable, and reproducible SERS spectra of leucine were successfully obtained. When the maximum SPR peak matched with the excitation wavelength, the substrate gave rise to the highest SERS enhancement. Furthermore, six different fluorescent dyes were also chosen as probe molecules. It was found that the substrate showed good Raman enhancement and highly efficient fluorescence quenching characteristic on these fluorescent dyes.