Characterization of Ag/Pt core-shell nanoparticles by UV-vis absorption, resonance light-scattering techniques

被引：75
|
作者：
Chen, Langxing [1 ]
Zhao, Wenfeng
Jiao, Wen
He, Xiwen
Wang, Jing
Zhang, Yukui
机构：
[1] Nankai Univ, Dept Chem, Tianjin 30071, Peoples R China
[2] Chinese Acad Sci, Dalian Inst Chem Phys, Natl Chromatog Res & Anal Ctr, Dalian 116011, Peoples R China
来源：
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY | 2007年 / 68卷 / 03期
基金：
中国国家自然科学基金;
关键词：
core-shell; Ag/Pt bimetallic nanoparticles; resonance light-scattering; Nonlinear;
D O I：
10.1016/j.saa.2006.12.014
中图分类号：
O433 [光谱学];
学科分类号：
0703 ; 070302 ;
摘要：
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. (C) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码：484 / 490
页数：7
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