Document Detail


Al(2)O(3)(112[combining macron]0) surface as a template for the ordered growth of Ni and Co nanoclusters.
MedLine Citation:
PMID:  22231389     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The morphology and thermal stability of Ni and Co nanoclusters grown by physical vapour deposition on a reconstructed (112[combining macron]0) surface of α-Al(2)O(3) is investigated using non-contact atomic force microscopy (NC-AFM). NC-AFM images reveal that the clean α-Al(2)O(3)(112[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-Al(2)O(3)(112[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.
Authors:
Krithika Venkataramani; Thomas N Jensen; Stig Helveg; Michael Reichling; Flemming Besenbacher; Jeppe V Lauritsen
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-1-9
Journal Detail:
Title:  Physical chemistry chemical physics : PCCP     Volume:  -     ISSN:  1463-9084     ISO Abbreviation:  -     Publication Date:  2012 Jan 
Date Detail:
Created Date:  2012-1-10     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100888160     Medline TA:  Phys Chem Chem Phys     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Interdisciplinary Nanoscience Center (iNANO), University of Aarhus, Ny Munkegade 118, DK-8000 Aarhus C, Denmark. jvang@inano.au.dk.
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