Palladium nanocrystals on Al2O3:: Structure and adhesion energy

被引：278
作者：
Hansen, KH
Worren, T
Stempel, S
Lægsgaard, E
Bäumer, M
Freund, HJ
Besenbacher, F
Stensgaard, I [1 ]
机构：
[1] Aarhus Univ, Inst Phys & Astron, DK-8000 Aarhus C, Denmark
[2] Aarhus Univ, CAMP, DK-8000 Aarhus C, Denmark
[3] Max Planck Gesell, Fritz Haber Inst, D-14195 Berlin, Germany
来源：
PHYSICAL REVIEW LETTERS | 1999年 / 83卷 / 20期
关键词：
D O I：
10.1103/PhysRevLett.83.4120
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We have investigated the structure and morphology of nanosized palladium clusters supported by a thin Al2O3 film on NiAl(110) using scanning tunneling microscopy. Well-ordered clusters with a diameter above approximate to 40 Angstrom. were imaged with atomic resolution, allowing a crystallographic identification of the cluster facets. A new method to obtain quantitative information on the work of adhesion (adhesion energy) of metal clusters deposited on oxides is introduced. For Pd on Al2O3 we obtain a value of W-adh = 2.8 +/- 0.2 J/m(2). This result is at variance with values recently derived on the basis of ab initio density-functional theory.
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收藏
页码：4120 / 4123
页数：4
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