Real-Time Imaging of the Formation of Au-Ag Core-Shell Nanoparticles

被引：59

作者：

Tan, Shu Fen ^{[1
]}

Chee, See Wee ^{[2
,3
,4
,5
,6
,7
]}

Lin, Guanhua ^{[2
,3
,4
,5
,6
,7
]}

Bosman, Michel ^{[8
,9
]}

Lin, Ming ^{[8
]}

Mirsaidov, Utkur ^{[2
,3
,4
,5
,6
,7
]}

Nijhuis, Christian A. ^{[1
,6
,7
]}

机构：

[1] Natl Univ Singapore, Dept Chem, 3 Sci Dr 3, Singapore 117543, Singapore

[2] Natl Univ Singapore, Ctr Bioimaging Sci, 14 Sci Dr 4, Singapore 117543, Singapore

[3] Natl Univ Singapore, Dept Biol Sci, 14 Sci Dr 4, Singapore 117543, Singapore

[4] Natl Univ Singapore, Dept Phys, 2 Sci Dr 3, Singapore 117551, Singapore

[5] Natl Univ Singapore, NUSNNI Nanocore, 5A Engn Dr 1, Singapore 117411, Singapore

[6] Natl Univ Singapore, Ctr Adv Mat 2D, 6 Sci Dr 2, Singapore 117546, Singapore

[7] Natl Univ Singapore, Graphene Res Ctr, 6 Sci Dr 2, Singapore 117546, Singapore

[8] ASTAR, Inst Mat Res & Engn, 2 Fusionopolis Way, Singapore 138634, Singapore

[9] Natl Univ Singapore, Dept Mat Sci & Engn, 9 Engn Dr 1, Singapore 117575, Singapore

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2016年 / 138卷 / 16期

基金：

新加坡国家研究基金会;

关键词：

IN-SITU TEM; ELECTRON-MICROSCOPY; GROWTH; NANOCRYSTALS; NUCLEATION; NANOCUBES; NANOSTRUCTURES; RESONANCES; CATALYSIS;

D O I：

10.1021/jacs.6b00594

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We study the overgrowth process of silver on-gold nanocubes in dilute, aqueous silver nitrate solution in the presence of a reducing agent, ascorbic acid, using in situ liquid-cell electron microscopy. Au-Ag core-shell nanostructures were formed via two mechanistic pathways: (1) nuclei coalescence, where the Ag nanoparticles absorbed onto the Au nanocubes, and (2) monomer attachment, where the Ag atoms epitaxially deposited onto the Au nanocubes. Both pathways lead to the same Au Ag core-shell nanostructures. Analysis of the Ag deposition rate reveals the growth modes of this process and shows that this reaction is chemically mediated by the reducing agent.

引用

页码：5190 / 5193

页数：4

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