Growth mode of Pt clusters deposited on γ-Al2O3(111)/NiAl(110):: a TEM study

被引：16
作者：
Klimenkov, M
Kuhlenbeck, H
Nepijko, SA
机构：
[1] Max Planck Soc, Fritz Haber Inst, D-14195 Berlin, Germany
[2] Forschungszentrum Karlsruhe, Inst Mat Res 1, D-76021 Karlsruhe, Germany
[3] Natl Acad Sci Ukraine, Inst Phys, UA-03028 Kiev, Ukraine
来源：
SURFACE SCIENCE | 2003年 / 539卷 / 1-3期
关键词：
aluminum oxide; platinum; clusters; electron microscopy;
D O I：
10.1016/S0039-6028(03)00720-9
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：
Pt clusters deposited on a gamma-Al2O3(1 1 1)/NiAl(I 10) substrate under ultra-high vacuum conditions were studied by transmission electron microscopy. Cluster size and density were varied by altering substrate temperature during deposition and the platinum coverage. The average cluster size was found to increase monotonically with increasing platinum coverage whereas the cluster density exhibits a maximum. It was also found that the deposition temperature strongly affects the cluster growth. When the temperature increases between 300 and 600 K, the aspect ratio (the relationship between the cluster height and its lateral size) increases as well. (C) 2003 Published by Elsevier B.V.
引用
收藏
页码：31 / 36
页数：6
相关论文
共 13 条
[1]   THE GROWTH AND PROPERTIES OF PD AND PT ON AL2O3/NIAL(110) [J].
BAUMER, M ;
LIBUDA, J ;
SANDELL, A ;
FREUND, HJ ;
GRAW, G ;
BERTRAMS, T ;
NEDDERMEYER, H .
BERICHTE DER BUNSEN-GESELLSCHAFT-PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 1995, 99 (11) :1381-1386
[2]  
Baumer M, 1997, NATO ADV SCI I E-APP, V331, P61
[3]   Growth and morphology of Rh deposits on an alumina film under UHV conditions and under the influence of CO [J].
Baumer, M ;
Frank, M ;
Libuda, J ;
Stempel, S ;
Freund, HJ .
SURFACE SCIENCE, 1997, 391 (1-3) :204-215
[4]   STRUCTURAL CHARACTERIZATION OF A MODEL CATALYST - PT/AL2O3/NIAL(110) [J].
BERTRAMS, T ;
WINKELMANN, F ;
UTTICH, T ;
FREUND, HJ ;
NEDDERMEYER, H .
SURFACE SCIENCE, 1995, 331 :1515-1519
[5]   FORMATION OF A WELL-ORDERED ALUMINUM-OXIDE OVERLAYER BY OXIDATION OF NIA1(110) [J].
JAEGER, RM ;
KUHLENBECK, H ;
FREUND, HJ ;
WUTTIG, M ;
HOFFMANN, W ;
FRANCHY, R ;
IBACH, H .
SURFACE SCIENCE, 1991, 259 (03) :235-252
[6]   The structure of Pt-aggregates on a supported thin aluminum oxide film in comparison with unsupported alumina: a transmission electron microscopy study [J].
Klimenkov, M ;
Nepijko, S ;
Kuhlenbeck, H ;
Baumer, M ;
Schlogl, R ;
Freund, HJ .
SURFACE SCIENCE, 1997, 391 (1-3) :27-36
[7]   Transmission electron microscopic investigation of an ordered Al2O3 film on NiAl(110) [J].
Klimenkov, M ;
Nepijko, S ;
Kuhlenbeck, H ;
Freund, HJ .
SURFACE SCIENCE, 1997, 385 (01) :66-76
[8]   STRUCTURAL CHARACTERIZATION OF PLATINUM DEPOSITS SUPPORTED ON ORDERED ALUMINA FILMS [J].
LIBUDA, J ;
BAUMER, M ;
FREUND, HJ .
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS, 1994, 12 (04) :2259-2264
[9]   STRUCTURE AND DEFECTS OF AN ORDERED ALUMINA FILM ON NIAL(110) [J].
LIBUDA, J ;
WINKELMANN, F ;
BAUMER, M ;
FREUND, HJ ;
BERTRAMS, T ;
NEDDERMEYER, H ;
MULLER, K .
SURFACE SCIENCE, 1994, 318 (1-2) :61-73
[10]   Imaging micro-cracks in gold films: a comparative study of scanning tunneling and atomic force microscopies [J].
Neves, BRA ;
Vilela, JMC ;
Russell, PE ;
Reis, ACC ;
Andrade, MS .
ULTRAMICROSCOPY, 1999, 76 (1-2) :61-67
12