SCANNING TUNNELING MICROSCOPY INVESTIGATIONS OF PLATINUM-COVERED GA2O3 THIN-FILM SUPPORTED CATALYSTS

被引：19

作者：

HANRIEDER, W

SCHOLZ, A

MEIXNER, H

机构：

[1] Siemens AG, Research Laboratories. Otto-Hahn Ring 6

来源：

SURFACE SCIENCE | 1991年 / 243卷 / 1-3期

关键词：

D O I：

10.1016/0039-6028(91)90355-V

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：

Scanning tunneling microscopy (STM) recordings of a Pt-covered Ga2O3 thin-film surface are presented for the first time. The investigated system can be regarded as a real supported catalyst. The catalytic activity with respect to the CO oxidation at T = 830 K is verified in a vacuum chamber with the aid of a quadrupole mass spectrometer. Increasing the temperature to T = 1000-1200 K leads to a degradation of the catalytic activity of the Pt/Ga2O3 system. STM recordings of the topography and of the local barrier height, as well as Auger electron spectroscopy, show this to result from a reduction of the effective Pt component at the specimen surface due to droplet growth.

引用

页码：166 / 178

页数：13

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[2]

BINNIG G, 1985, PHYS REV LETT, V50, P2002

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