SFG and STM studies of the Pt(111) crystal face at atmospheric CO and oxygen pressures: Preparation of platinum nanocluster arrays

被引：35

作者：

Su, XC

Jensen, J

Yang, MX

Salmeron, MB

Shen, YR

Somorjai, GA

机构：

[1] UNIV CALIF BERKELEY, DEPT CHEM, BERKELEY, CA 94720 USA

[2] UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, DIV MAT SCI, MS 66 200, BERKELEY, CA 94720 USA

来源：

FARADAY DISCUSSIONS | 1996年 / 105卷

关键词：

D O I：

10.1039/fd9960500263

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：

Studies of crystal surfaces at high pressures (ca. 1 atm) and during catalytic reactions become possible by the application of sum frequency generation (SFG) vibrational spectroscopy and scanning tunnelling microscopy (STM). We present the SFG spectra of CO on Pt(lll) as a function of pressure and show evidence for the reversible formation of carbonyl clusters with a CO/Pt ratio of > 1 and for an incommensurate CO layer at high pressures. These species turn over rapidly to produce CO2 during CO oxidation. STM studies show significant reconstruction of Pt(110) in both CO and O-2, while the surface structure of the Pt(lll) crystal face exhibits only minor changes. Platinum nanocluster arrays in the 3-100 nm range have been produced by electron beam lithography. These cluster systems produced on different oxide supports can be used as model catalysts.

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页码：263 / 274

页数：12

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