X-ray Absorption Near-Edge Structure and X-ray Photoelectron Spectroscopy Studies of Interfacial Charge Transfer in Gold-Silver-Gold Double-Shell Nanoparticles

被引：67

作者：

Nishimura, Shun ^{[1
]}

Anh Thi Ngoc Dao ^{[1
]}

Mott, Derrick ^{[1
]}

Ebitani, Kohki ^{[1
]}

Maenosono, Shinya ^{[1
]}

机构：

[1] Japan Adv Inst Sci & Technol, Sch Mat Sci, Nomi, Ishikawa 9231292, Japan

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2012年 / 116卷 / 07期

关键词：

SOLVENT-FREE OXIDATION; ELECTRONIC-STRUCTURE; CATALYTIC-ACTIVITY; ORBITAL OCCUPANCY; AU NANOPARTICLES; NOBLE-METALS; PD; BEHAVIOR; PLATINUM; XANES;

D O I：

10.1021/jp212031h

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：

Charge transfer in heteromeric structures such as gold-silver-core shell (Au@ Ag) nanoparticles (NPs) and gold-silver-gold double-shell (Au@Ag@Au) NPs was demonstrated using X-ray absorption near-edge structure (XANES) and X-ray photoelectron spectroscopy (XPS) techniques. XANES analyses confirmed that the d-orbital hole density of the Au atoms increases in the following order: Au foil congruent to Au NPs < Au@Ag NPs < Au@Ag@Au NPs. In conjunction with observed positive and negative shifts in the Au 4f and Ag 3d binding energies in XPS spectra of Au@Ag and Au@Ag@Au NPs, we conclude that d electrons are transferred from Au to Ag in the heteromeric NPs due to the charge compensation mechanism. By taking advantage of the charge transfer phenomenon, one can modify the electronic structure of heteromeric NPs with enhanced chemical stability and optical/electronic properties.

引用

页码：4511 / 4516

页数：6

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