Different W cluster deposition regimes in pulsed laser ablation observed by in situ scanning tunneling microscopy

被引：19

作者：

Cattaneo, D. ^{[1
]}

Foglio, S. ^{[1
]}

Casari, C. S. ^{[1
]}

Li Bassi, A. ^{[1
]}

Passoni, M. ^{[1
]}

Bottani, C. E. ^{[1
]}

机构：

[1] Politecn Milan, NEMAS Ctr Nanoengn Mat & Surfaces, CNISM Dipartimento Ingn Nucl, I-20133 Milan, Italy

来源：

SURFACE SCIENCE | 2007年 / 601卷 / 08期

关键词：

scanning tunneling microscopy (STM); pulsed laser deposition (PLD); tungsten clusters;

D O I：

10.1016/j.susc.2007.02.017

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 report on how different cluster deposition regimes can be obtained and observed by in situ scanning tunneling microscopy by exploiting deposition parameters in a pulsed laser deposition process. Tungsten clusters were produced by nanosecond pulsed laser ablation in Ar atmosphere at different pressures and deposited on Au(1 1 1) and HOPG surfaces. Deposition regimes including cluster deposition-diffusion-aggregation, cluster melting and coalescence and cluster implantation were observed, depending on background gas pressure and target-to-substrate distance which influence the kinetic energy of the ablated species. These parameters can thus be easily employed for surface modification by cluster bombardment, deposition of supported clusters and growth of films with different morphologies. The variation in cluster mobility on different substrates and its influence on aggregation and growth mechanisms has also been investigated. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：1892 / 1897

页数：6

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[1] Propagation dynamics of a LaMnO3 laser ablation plume in an oxygen atmosphere [J].