Perforated nanocap array: Facile fabrication process and efficient surface enhanced Raman scattering with fluorescence suppression

Recently, individual reduced-symmetry metal nanostructures and their plasmonic properties have been studied extensively. However, little attention has been paid to the approach to fabricating ordered reduced-symmetry metal nanostructure arrays. In this paper, a novel perforated silver nanocap array with high surface-enhanced Raman scattering (SERS) activity and fluorescence suppression is reported. The array is fabricated by electron beam evaporating Ag onto the perforated barrier layer side of a hard anodization (HA) anodic aluminum oxide (AAO) template. The morphology and optical property of the perforated silver nanocap array are characterized by an atomic force microscope (AFM), a scanning electron microscope (SEM), and absorption spectra. The results of SERS measurements reveal that the perforated silver nanocap array offers high SERS activity and fluorescence suppression compared with an imperforated silver nanocap array.     

银三角纳米粒子的制备及其稳定性的研究

室温下,通过控制银种子胶体pH值,采用光诱导法制备出银三角纳米粒子,并对其表面增强喇曼散射活性和时间稳定性进行了实验研究.对比分析了新制备样品与在暗室中存放5个月样品的透射电子显微镜照片、紫外-可见吸收光谱和表面增强喇曼光谱.结果表明:所制备的银三角纳米粒子在室温暗室中存放5个月后其几何形状、尺寸以及相应吸收峰的位置基本不变,具有较好的时间稳定性,对罗丹明6G探针分子仍具有较好的表面增强喇曼效应.