Infrared reflection-absorption properties of platinum nanoparticle films on metal electrode substrates: control of anomalous opticaleffects

被引：48

作者：

Park, S

Tong, Y

Wieckowski, A

Weaver, MJ ^{[1
]}

机构：

[1] Purdue Univ, Dept Chem, W Lafayette, IN 47907 USA

[2] Univ Illinois, Dept Chem, Urbana, IL 61801 USA

来源：

ELECTROCHEMISTRY COMMUNICATIONS | 2001年 / 3卷 / 09期

基金：

美国国家科学基金会;

关键词：

nanoparticles; infrared reflection-absorption properties; platinum;

D O I：

10.1016/S1388-2481(01)00202-8

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

A simple method is described for preparing ultrathin films of carbon-supported platinum nanoparticles on gold and other substrates for examination by electrochemical infrared reflection-absorption spectroscopy (EC-IRAS) in which the anomalous "anti-absorbance" properties commonly observed for metal particle arrays can be minimized as well as controlled. The tactic involves physical deposition as an aqueous suspension, followed by drying and thorough rinsing. The Pt monolayer-level films prepared by this means exhibit largely positive unipolar absorbance bands for CO adlayers, whereas an anomalous inverted band component appears for thicker films, especially those featuring high Pt nanoparticle loadings. These findings demonstrate the value of the film preparation tactic for exploring the electrocatalytic properties of C/Pt materials by using combined electrochemical and EC-IRAS measurements. (C) 2001 Elsevier Science BN. All rights reserved.

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收藏

页码：509 / 513

页数：5

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