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

Citation
Mjj. Jak et al., Scanning tunnelling microscopy study of the growth of small palladium particles on TiO2(110), SURF SCI, 457(3), 2000, pp. 295-310
Citations number
48
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
SURFACE SCIENCE
ISSN journal
00396028 → ACNP
Volume
457
Issue
3
Year of publication
2000
Pages
295 - 310
Database
ISI
SICI code
0039-6028(20000610)457:3<295:STMSOT>2.0.ZU;2-E
Abstract
We studied the thermal stability of small palladium clusters on a TiO2(110) surface. Upon heating the number of particles decreases and the average si ze of the particles increases. This corresponds to a decrease of palladium surface area of this model catalyst. The decrease in particle density canno t be used to distinguish between different kinds of mass transport over the surface, but on the basis of the resulting size distribution we conclude t hat the coalescence of diffusing particles is the main mechanism. This is s upported by a direct observation of mobile clusters. During growth the pall adium clusters change their shape. (C) 2000 Elsevier Science B.V. All right s reserved.