通过紫外-可见吸收、共振光散射技术对银/铂核壳纳米粒子进行表征。
Characterization of Ag/Pt core-shell nanoparticles by UV-vis absorption, resonance light-scattering techniques.
作者信息
Chen Langxing, Zhao Wenfeng, Jiao Yufen, He Xiwen, Wang Jing, Zhang Yukui
机构信息
Department of Chemistry, Nankai University, Tianjin, China.
出版信息
Spectrochim Acta A Mol Biomol Spectrosc. 2007 Nov;68(3):484-90. doi: 10.1016/j.saa.2006.12.014. Epub 2006 Dec 20.
The water-soluble Ag/Pt core-shell nanoparticles were prepared by deposition Pt over Ag colloidal seeds with the seed-growth method using K2PtCl4 with trisodium citrate as reduced agent. The Ag:Pt ratio is varied from 9:1 to 1:3 for synthesizing Pt shell layer of different thickness. A remarkable shift and broadening of Ag surface plasmon band around 410 nm was observed. The contrast of TEM images of Ag/Pt colloids has been obtained. Various techniques, such as transmission electron microscopy (TEM), UV-vis absorption and resonance light-scattering spectroscopy were used to characterize nanoparticles. The data of TEM, UV-vis and resonance light-scattering spectrum all confirm formation of Ag/Pt core-shell nanoparticles. Resonance light-scattering and emission spectrum show the Ag and Ag/Pt core-shell nanoparticles have a nonlinear light-scattering characteristic.
采用种子生长法，以K2PtCl4为铂源，柠檬酸钠为还原剂，在银胶体种子上沉积铂，制备了水溶性Ag/Pt核壳纳米粒子。为合成不同厚度的铂壳层，Ag:Pt比例在9:1至1:3之间变化。观察到410nm附近的银表面等离子体带发生了显著的位移和展宽。获得了Ag/Pt胶体的透射电镜图像对比度。采用透射电子显微镜（TEM）、紫外可见吸收光谱和共振光散射光谱等多种技术对纳米粒子进行了表征。TEM、紫外可见光谱和共振光散射光谱数据均证实了Ag/Pt核壳纳米粒子的形成。共振光散射和发射光谱表明，银和Ag/Pt核壳纳米粒子具有非线性光散射特性。
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