Mechanism of Gold Nanoparticle Formation in the Classical Citrate Synthesis Method Derived from Coupled In Situ XANES and SAXS Evaluation

被引：540

作者：

Polte, Joerg ^{[2
]}

Ahner, T. Torsten ^{[1
]}

Delissen, Friedmar ^{[2
]}

Sokolov, Sergey ^{[1
]}

Emmerling, Franziska ^{[2
]}

Thuenemann, Andreas F. ^{[2
]}

Kraehnert, Ralph ^{[1
]}

机构：

[1] Univ Rostock, Leibniz Inst Katalyse eV, D-18059 Rostock, Germany

[2] BAM Fed Inst Mat Res & Testing, D-12489 Berlin, Germany

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2010年 / 132卷 / 04期

关键词：

SMALL-ANGLE; SIZE; GROWTH; NUCLEATION; REDUCTION;

D O I：

10.1021/ja906506j

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Although gold nanoparticles (GNP) are among the most intensely studied nanoscale materials, the actual mechanisms of GNP formation often remain unclear due to limited accessibility to in situ-derived time-resolved information about precursor conversion and particle size distribution. Overcoming such limitations, a method is presented that analyzes the formation of nanoparticles via in situ SAXS and XANES using synchrotron radiation. The method is applied to study the classical GNP synthesis route via the reduction of tetrachloroauric acid by trisodium citrate at different temperatures and reactant concentrations. A mechanism of nanoparticle formation is proposed comprising different steps of particle growth via both coalescence of nuclei and further monomer attachment. The coalescence behavior of small nuclei was identified as one essential factor in obtaining a narrow size distribution of formed particles.

引用

页码：1296 / 1301

页数：6

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