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

被引：76

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

页码：484 / 490

页数：7

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