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Digital image processing of nanometer-size metal particles on amorphous substratesThe task of differentiating very small metal aggregates supported on amorphous films from the phase contrast image features inherently stemming from the support is extremely difficult in the nanometer particle size range. Digital image processing was employed to overcome some of the ambiguities in evaluating such micrographs. It was demonstrated that such processing allowed positive particle detection and a limited degree of statistical size analysis even for micrographs where by bare eye examination the distribution between particles and erroneous substrate features would seem highly ambiguous. The smallest size class detected for Pd/C samples peaks at 0.8 nm. This size class was found in various samples prepared under different evaporation conditions and it is concluded that these particles consist of 'a magic number' of 13 atoms and have cubooctahedral or icosahedral crystal structure.
Document ID
19900034852
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Soria, F.
(CSIC Instituto de Ciencia de Materiales, Madrid, Spain)
Artal, P.
(Consejo Superior de Investigaciones Cientificas Madrid, Spain)
Bescos, J.
(CSIC Instituto de Optica, Madrid, Spain)
Heinemann, K.
(Eloret Institute Palo Alto, CA, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1989
Publication Information
Publication: Ultramicroscopy
Volume: 24
ISSN: 0304-3991
Subject Category
Instrumentation And Photography
Accession Number
90A21907
Funding Number(s)
CONTRACT_GRANT: NCC2-283
Distribution Limits
Public
Copyright
Other

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