Synthesis and characterization of Au@Co and Au@Ni core-shell nanoparticles and their applications in surface-enhanced Raman Spectroscopy

被引：84

作者：

Bao, Fang ^{[1
]}

Li, Jian-Feng ^{[2
,3
]}

Ren, Bin ^{[2
,3
]}

Yao, Jian-Lin ^{[1
]}

Gu, Ren-Ao ^{[1
]}

Tian, Zhong-Qun ^{[2
,3
]}

机构：

[1] Suzhou Univ, Dept Chem, Suzhou 215006, Peoples R China

[2] Xiamen Univ, State Key Lab Phys Chem Solid Surfaces, Xiamen 361005, Peoples R China

[3] Xiamen Univ, Dept Chem, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2008年 / 112卷 / 02期

关键词：

D O I：

10.1021/jp075844k

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Au@Co and Au@Ni core-shell nanoparticles with controllable shell thicknesses were prepared by reduction of Co2+ and Ni2+ salts with hydrazine hydrate in ethanol over preformed An seeds. Both cyclic voltammetric and surface-enhanced Raman studies using CO as the probe molecule confirmed the core-shell structure of the synthesized nanoparticles. The Au@Co and Au@Ni nanoparticles dispersed on a glassy carbon electrode surface exhibit high surface-enhanced Raman scattering (SERS) effect for the adsorbed pyridine. High-quality SERS spectra of CO absorbed on Co and Ni have been obtained through the high enhancement of the core-shell nanoparticles. The originally low surface enhancement of the Co and Ni can be substantially improved giving total enhancement factors up to 10(3)-10(4). Such a SERS-active substrate can be used as an alternative substrate for investigating adsorption and reactions occurring on the Co and Ni metal surfaces.

引用

页码：345 / 350

页数：6

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