Effect of CO on the morphology of Pt nanoparticles supported on TiO2 (110)-(1xn)

被引：32

作者：

Berkó, A ^{[1
]}

Szöko, J ^{[1
]}

Solymosi, F ^{[1
]}

机构：

[1] Univ Szeged, Hungarian Acad Sci, React Kinet Res Grp, Inst Solid State & Radiochem, H-6701 Szeged, Hungary

来源：

SURFACE SCIENCE | 2004年 / 566卷

关键词：

carbon monoxide; surface structure; morphology; roughness; and topography; platinum; clusters; growth; titanium oxide; scanning tuneling microscopy;

D O I：

10.1016/j.susc.2004.05.065

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：

The effect of CO on the morphology of Pt nanoparticles of different sizes (1-4 nm) supported on TiO2 (1 1 0)-(1 x n) surface was investigated by scanning tunnelling microscopy (STM). The CO pressure was varied in the range of 10(-3)-10(1) mbar. It was found that CO adsorption induces a significant increase in the initial size of the Pt nanoparticles of 1-2 nm even at room temperature. The agglomeration, however, is characteristically preceded by disruption of the smaller Pt nanoclusters at lower CO pressures. This finding was explained by CO-assisted Ostwald ripening, in which the mass transport proceeds via surface carbonyl intermediates. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：337 / 342

页数：6

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