Shape Control of Gold Nanoparticles by Silver Underpotential Deposition

被引：340

作者：

Personick, Michelle L.

Langille, Mark R.

Zhang, Jian

Mirkin, Chad A. ^{[1
]}

机构：

[1] Northwestern Univ, Dept Chem, Evanston, IL 60208 USA

来源：

NANO LETTERS | 2011年 / 11卷 / 08期

基金：

美国国家科学基金会;

关键词：

Anisotropic nanostructures; gold; underpotential deposition; silver; seed-mediated synthesis; HIGH-INDEX FACETS; TRIANGULAR BIPYRAMIDS; METAL NANOCRYSTALS; MEDIATED SYNTHESIS; NANORODS; GROWTH; NANOPRISMS; MICROSCOPY; EXCITATION; MECHANISM;

D O I：

10.1021/nl201796s

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Four different gold nanostructures: octahedra, rhombic dodecahedra, truncated ditetragonal prisms, and concave cubes, have been synthesized using a seed-mediated growth method by strategically varying the Ag+ concentration in the reaction solution. Using X-ray photoelectron spectroscopy and inductively coupled plasma atomic emission spectroscopy, we provide quantitative evidence that Ag underpotential deposition is responsible for stabilizing the various surface facets that enclose the above nanoparticles. Increasing concentrations of Ag+ in the growth solution stabilize more open surface facets, and experimental values for Ag coverage on the surface of the particles fit well with a calculated monolayer coverage of Ag, as expected via underpotential deposition.

引用

页码：3394 / 3398

页数：5

共 51 条

[1] The Crystalline Structure of Gold Nanorods Revisited: Evidence for Higher-Index Lateral Facets [J].