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Deutsche Physikalische Gessellschaft IOP Institute of Physics

Al2O3-films on Ni3Al(111): a template for nanostructured cluster growth

Focus on Clusters at Surfaces

C Becker1,5, A Rosenhahn1, A Wiltner2, K von Bergmann3, J Schneider1, P Pervan4, M Milun4, M Kralj4 and K Wandelt1

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Part of Focus on Clusters at Surfaces

In scanning tunnelling microscope images of thin Al2O3-films grown on Ni3Al(111) at 1000 K two super-lattices with periodicities of 2.6 and 4.5 nm, respectively, can be identified. These well-ordered nanostructures can be used as nucleation centres for metal particle growth. It can be shown that both nanostructures act as a template for the fabrication of ordered assemblies of metal clusters by mere physical vapour deposition. The degree of ordering of these nanostructures is largely dependent on the metal deposited. Here we report on the growth of Cu, Ag, Au, Mn, and V clusters on the Al2O3-films. The best results as far as ordering of the clusters is concerned was reached for V deposition at 550 K, which resulted in a nearly perfect hexagonal array of clusters with a spacing of 2.6 nm.


PACS

68.55.A- Nucleation and growth

68.37.Ef Scanning tunneling microscopy (including chemistry induced with STM)

81.16.Be Chemical synthesis methods

61.46.-w Structure of nanoscale materials

Subjects

Surfaces, interfaces and thin films

Nanoscale science and low-D systems

Dates

Issue 1 (October 2002)

Received 11 July 2002

Published 23 October 2002



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