Jump to main content
Jump to site search

Issue 6, 2012
Previous Article Next Article

Al2O3(11[2 with combining macron]0) surface as a template for the ordered growth of Ni and Co nanoclusters

Author affiliations

Abstract

The morphology and thermal stability of Ni and Co nanoclusters grown by physical vapour deposition on a reconstructed (11[2 with combining macron]0) surface of α-Al2O3 is investigated using non-contact atomic force microscopy (NC-AFM). NC-AFM images reveal that the clean α-Al2O3(11[2 with combining macron]0) substrate adopts a characteristic (12 × 4) reconstruction when prepared in vacuum at high temperature. Subsequent deposition of Ni and Co onto this substrate at room temperature facilitates the growth of well-ordered metal nanocluster arrays with a preferred inter-cluster distance determined by the (12 × 4) periodicity of the substrate surface. The order in the cluster arrangement remains intact even upon annealing the system to temperatures up to 500 °C indicating a high resistance against sintering. The reconstructed α-Al2O3(11[2 with combining macron]0) surface can, therefore, serve as an appropriate insulating template for studies of size-dependent magnetic or catalytic effects in a well-defined ensemble of metallic nanoclusters.

Graphical abstract: Al2O3(11 [[2 with combining macron]] 0) surface as a template for the ordered growth of Ni and Co nanoclusters

Back to tab navigation

Article information


Submitted
24 Aug 2011
Accepted
02 Dec 2011
First published
09 Jan 2012

Phys. Chem. Chem. Phys., 2012,14, 2092-2098
Article type
Paper

Al2O3(11[2 with combining macron]0) surface as a template for the ordered growth of Ni and Co nanoclusters

K. Venkataramani, T. N. Jensen, S. Helveg, M. Reichling, F. Besenbacher and J. V. Lauritsen, Phys. Chem. Chem. Phys., 2012, 14, 2092
DOI: 10.1039/C2CP22712F

Social activity

Search articles by author

Spotlight

Advertisements