【摘要】 采用真空离子溅射法在自组装的单层阵列二氧化硅纳米粒子表面沉积金薄膜,制备了以S iO2为核的帽状金纳米结构.用透射电镜、扫描电镜、原子力显微镜、X射线衍射仪和紫外-可见-近红外分光光度计对样品的表面形貌、结构及光学性质进行了表征.以亚甲基蓝作为探针分子,对金纳米帽的表面增强拉曼散射活性进行了研究,结果显示,吸附在金纳米帽上的分子拉曼散射信号得到显著增强,增强因子达到107数量级.该基底在超灵敏生物和化学检测方面具有潜在的应用前景.更多还原

【Abstract】 Cap-shaped gold nanostructures,consisting of a SiO2 core with a Au cap,were prepared with vacuum ion sputtering by depositing Au films onto the surface of self-assembled monolayer arrays of SiO2 nanoparticles.Their surface morphologies,structures,and optical properties were characterized via TEM,SEM,AFM,XRD,and UV-Vis-NIR spectrophotometer.The surface-enhanced Raman scattering(SERS) activities of gold nanocaps were investigated with methylene blue as a probe molecule.The Raman scattering signal of the adsorbed molecule was found to be enhanced remarkably,and an enhancement factor of the order of 107 was estimated,which indicated that they are potentially useful for ultrasensitive biological and chemical detection.更多还原