A mechanism for transition-metal nanoparticle self-assembly

被引：187

作者：

Besson, C ^{[1
]}

Finney, EE ^{[1
]}

Finke, RG ^{[1
]}

机构：

[1] Colorado State Univ, Dept Chem, Ft Collins, CO 80523 USA

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2005年 / 127卷 / 22期

关键词：

D O I：

10.1021/ja0504439

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The four-step mechanism by which transition-metal nanoclusters or bulk-metal films self-assemble from metal salts under reductive conditions has been discovered. The presence of two autocatalytic steps in the same reaction scheme-double autocatalysis-is the key to the sharp "turn-on" feature after an induction period observed in the signature kinetic curves. Predictions of the new mechanism that are tested experimentally include the following: that low concentrations and high temperatures will favor nanoclusters over bulk-metal film formation; that bulk-metal is formed in some, if not many, literature syntheses reporting only Pt-0 nanoclusters; and that added ligands are one key to turning on the new mechanism. Particle-size-dependent metal-ligand bond dissociation energies are another implication from this mechanistic work.

引用

页码：8179 / 8184

页数：6

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