Scanning tunnelling microscopy study of the growth of small palladium particles on TiO2(110)

被引：99

作者：

Jak, MJJ

Konstapel, C

van Kreuningen, A

Verhoeven, J

Frenken, JWM

机构：

[1] FOM, Inst Atom & Mol Phys, NL-1098 SJ Amsterdam, Netherlands

[2] Leiden Univ, Kamerlingh Onnes Lab, NL-2300 RA Leiden, Netherlands

来源：

SURFACE SCIENCE | 2000年 / 457卷 / 03期

关键词：

catalysis; clusters; growth; palladium; scanning tunnelling microscopy; surface diffusion; titanium oxide;

D O I：

10.1016/S0039-6028(00)00431-3

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：

We studied the thermal stability of small palladium clusters on a TiO2(110) surface. Upon heating the number of particles decreases and the average size of the particles increases. This corresponds to a decrease of palladium surface area of this model catalyst. The decrease in particle density cannot be used to distinguish between different kinds of mass transport over the surface, but on the basis of the resulting size distribution we conclude that the coalescence of diffusing particles is the main mechanism. This is supported by a direct observation of mobile clusters. During growth the palladium clusters change their shape. (C) 2000 Elsevier Science B.V. All rights reserved.

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页码：295 / 310

页数：16

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