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Gas-induced restructuring of palladium model catalysts studied with atomic force microscopy
Linköping University, Department of Physics, Chemistry and Biology, Chemical and Optical Sensor Systems. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Physics, Chemistry and Biology, Chemical and Optical Sensor Systems. Linköping University, Faculty of Science & Engineering. (Tillämpad Fysik)ORCID iD: 0000-0002-0873-2877
Linköping University, Department of Medical and Health Sciences.
Linköping University, Department of Physics, Chemistry and Biology, Plasma and Coating Physics. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-1744-7322
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1991 (English)In: Journal of Vacuum Science & Technology B, ISSN 1071-1023, E-ISSN 1520-8567, Vol. 9, no 2, 825-828 p.Article in journal (Refereed) Published
Abstract [en]

The structure of thin Pd films evaporated onto planar SiO2 substrates changes dramatically during oxygen/hydrogen exposures in ultrahigh vacuum. In this work we have used an atomic force microscope(AFM), operated in the attractive mode, to obtain the three‐dimensional morphology of the Pd surface for different film thicknesses and treatments, and compared the data with transmission electron microscopy(TEM) micrographs. During restructuring, a 100‐Å film changes from being a smooth continuous film with cracks into metal clusters dispersed on the SiO2 support. In the 5‐Å case the metal films are already well dispersed as fabricated. Here the gas exposure instead results in a clustering effect resulting in larger particles. The AFM gives results which are consistent with TEM micrographs but also gives additional information on metal particle shape which can lead to a further understanding of the restructuring process.

Place, publisher, year, edition, pages
1991. Vol. 9, no 2, 825-828 p.
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-118348DOI: 10.1116/1.585520OAI: oai:DiVA.org:liu-118348DiVA: diva2:814509
Available from: 2015-05-27 Created: 2015-05-27 Last updated: 2015-06-08

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Erlandsson, RagnarEriksson, MatsOlsson, LarsHelmersson, UlfLundström, Ingemar
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Chemical and Optical Sensor SystemsFaculty of Science & EngineeringDepartment of Medical and Health SciencesPlasma and Coating PhysicsBiosensors and Bioelectronics
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Journal of Vacuum Science & Technology B
Condensed Matter Physics

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