Near surface nucleation and particle mediated growth of colloidal Au nanocrystals

被引：31

作者：

Cheng, Yingwen ^{[1
]}

Tao, Jinhui ^{[2
]}

Zhu, Guomin ^{[2
,3
]}

Soltis, Jennifer A. ^{[2
]}

Legg, Benjamin A. ^{[2
]}

Nakouzi, Elias ^{[2
]}

De Yoreo, James J. ^{[2
,3
]}

Sushko, Maria L. ^{[2
]}

Liu, Jun ^{[1
]}

机构：

[1] Pacific Northwest Natl Lab, Energy Proc & Mat Div, Richland, WA 99354 USA

[2] Pacific Northwest Natl Lab, Phys Sci Div, Richland, WA 99354 USA

[3] Univ Washington, Dept Mat Sci & Engn, Seattle, WA 98185 USA

来源：

NANOSCALE | 2018年 / 10卷 / 25期

关键词：

DENSITY-FUNCTIONAL THEORY; ORIENTED-ATTACHMENT; GOLD NANOPARTICLES; CRYSTAL-GROWTH; HETEROGENEOUS NUCLEATION; ELECTROLYTE-SOLUTIONS; CITRATE SYNTHESIS; MECHANISMS; REDUCTION; NANOSTRUCTURES;

D O I：

10.1039/c8nr03408g

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

During non-classical growth of nanostructures via assembly of primary nuclei, nucleation and assembly are assumed to be distinct processes: nanoparticles nucleate randomly and aggregate to form extended structures through Brownian motion in the presence of long-range attractive interactions. Here we investigate the relationship between these two processes by using in situ AFM, in situ, ex situ and cryo TEM and UV-Vis spectroscopy to observe growth of colloidal gold and simulations to develop a mechanistic model of the process. Our results reveal an inexorable link between nucleation and assembly with nuclei forming almost exclusively within a approximate to 1 nm interfacial region of existing particles. The new particles immediately close the gap either through a diffusive jump or via growth of a neck between the seed and new particle, generating aggregates exhibiting features commonly attributed to oriented attachment of independently nucleated particles. The results demonstrate that creation of initial particle interfaces leads to local environments that redirect growth towards non-classical processes.

引用

页码：11907 / 11912

页数：6

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