Synthesis and Characterization of Pt Dendrimer-Encapsulated Nanoparticles: Effect of the Template on Nanoparticle Formation

被引：133

作者：

Knecht, Marc R. ^{[2
]}

Weir, Michael G. ^{[2
]}

Myers, V. Sue ^{[2
]}

Pyrz, William D. ^{[3
]}

Ye, Heechang ^{[2
]}

Petkov, Valeri ^{[1
]}

Buttrey, Douglas J. ^{[3
]}

Frenkel, Anatoly I. ^{[4
]}

Crooks, Richard M. ^{[2
]}

机构：

[1] Cent Michigan Univ, Dept Phys, Mt Pleasant, MI 48859 USA

[2] Univ Texas Austin, Dept Chem & Biochem, Texas Mat Inst, Ctr Nano & Mol Sci & Technol, Austin, TX 78712 USA

[3] Univ Delaware, Dept Chem Engn, Ctr Catalyt Sci & Technol, Newark, DE 19716 USA

[4] Yeshiva Univ, Dept Phys, New York, NY 10016 USA

来源：

CHEMISTRY OF MATERIALS | 2008年 / 20卷 / 16期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1021/cm8004198

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In this article, we provide a detailed description of the synthesis and properties of Pt dendrimer-encapsulated nanoparticles (DENs) prepared using sixth-generation, hydroxyl-terminated, poly(amidoamine) (PAMAM) dendrimers (G6-OH) and three different PtCl42-/G6-OH ratios: 55, 147, and 240. Results obtained from UV-vis spectroscopy, X-ray photoelectron spectroscopy, electron microscopy, X-ray absorption spectroscopy, and high-energy X-ray diffraction show that only a fraction of the Pt2+/dendrimer precursors are reduced by BH4- and that the reduction process is highly heterogeneous. That is, after reduction each Pt2+/dendrimer precursor complex is either fully reduced, to yield a DEN having a size and structure consistent with the original PtCl42-/dendrimer ratio used for the synthesis, or the precursor is not reduced at at all. This result is consistent with an autocatalytic process that entails slow formation of a nascent catalytic Pt seed within the dendrimer, followed by rapid, catalytic reduction of nearby Pt2+ ions. Details concerning the formation of the Pt2+/dendrimer precursor are also discussed.

引用

页码：5218 / 5228

页数：11

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