Surface enrichment of Ag atoms in Au/Ag alloy nanoparticles revealed by surface enhanced Raman scattering spectroscopy

被引：91

作者：

Kim, K ^{[1
]}

Kim, KL ^{[1
]}

Lee, SJ ^{[1
]}

机构：

[1] Seoul Natl Univ, Sch Chem, Lab Intelligent Interfaces, Seoul 151742, South Korea

来源：

CHEMICAL PHYSICS LETTERS | 2005年 / 403卷 / 1-3期

基金：

新加坡国家研究基金会;

关键词：

D O I：

10.1016/j.cplett.2004.12.025

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/Ag alloy nanoparticles consisting of various mole fractions of gold and silver have been synthesized in aqueous medium using a citrate reduction method. UV/vis spectra confirm the formation of alloy nanoparticles and transmission electron microscopy reveals a rather uniform distribution of similar to35 nm-sized particles. The most interesting finding deduced from the surface-enhanced Raman scattering (SERS) of pyridine is that the Ag atoms are highly enriched in the outermost layers of the nanoparticles compared with their interiors. SERS is thus demonstrated to be an efficient surface analyzing tool specifically in nano scales for noble metal alloys. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：77 / 82

页数：6

共 20 条

[1] PLASMA RESONANCE ENHANCED RAMAN-SCATTERING BY ADSORBATES ON GOLD COLLOIDS - THE EFFECTS OF AGGREGATION [J].

BLATCHFORD, CG ;

CAMPBELL, JR ;

CREIGHTON, JA .

SURFACE SCIENCE, 1982, 120 (02) :435-455

[2]

Cesareo R, 1996, J TRACE MICROPROBE T, V14, P711

[3]

Chang R.K., 1982, Surface Enhanced Raman Scattering

[4] PLASMA RESONANCE ENHANCEMENT OF RAMAN-SCATTERING BY PYRIDINE ADSORBED ON SILVER OR GOLD SOL PARTICLES OF SIZE COMPARABLE TO THE EXCITATION WAVELENGTH [J].

CREIGHTON, JA ;

BLATCHFORD, CG ;

ALBRECHT, MG .

JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS II, 1979, 75 :790-798

[5] Gold nanoparticles: Assembly, supramolecular chemistry, quantum-size-related properties, and applications toward biology, catalysis, and nanotechnology [J].

Daniel, MC ;

Astruc, D .

CHEMICAL REVIEWS, 2004, 104 (01) :293-346

[6]

Guerra MF, 1998, X-RAY SPECTROM, V27, P73

[7] SMALL-PARTICLE RESEARCH - PHYSICOCHEMICAL PROPERTIES OF EXTREMELY SMALL COLLOIDAL METAL AND SEMICONDUCTOR PARTICLES [J].

HENGLEIN, A .

CHEMICAL REVIEWS, 1989, 89 (08) :1861-1873

[8] Ultrasensitive chemical analysis by Raman spectroscopy [J].

Kneipp, K ;

Kneipp, H ;

Itzkan, I ;

Dasari, RR ;

Feld, MS .

CHEMICAL REVIEWS, 1999, 99 (10) :2957-+

[9] Production of Au-Ag alloy nanoparticles by laser ablation of bulk alloys [J].

Lee, I ;

Han, SW ;

Kim, K .

CHEMICAL COMMUNICATIONS, 2001, (18) :1782-1783

[10] ADSORPTION AND SURFACE-ENHANCED RAMAN OF DYES ON SILVER AND GOLD SOLS [J].

LEE, PC ;

MEISEL, D .

JOURNAL OF PHYSICAL CHEMISTRY, 1982, 86 (17) :3391-3395

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