Interaction of Platinum Colloids with Single Crystalline Oxide and Graphite Substrates: A Combined AFM, STM and XPS Study Full article
Journal |
Catalysis Letters
ISSN: 1011-372X , E-ISSN: 1572-879X |
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Output data | Year: 1996, Volume: 37, Number: 1-2, Pages: 35-39 Pages count : 5 DOI: 10.1007/BF00813516 | ||||
Tags | Atomic force microscopy, Model catalysts, Platinum colloids, Scanning tunnelling microscopy | ||||
Authors |
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Affiliations |
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Funding (3)
1 | German Research Foundation | 436 RUS 17/116/94 |
2 | German Research Foundation | |
3 | Federal Ministry of Education and Research | FKZ 03D0007C8 |
Abstract:
The interaction of platinum colloids encapsulated by an organic shell (Pt-col) with oxide (sapphire, quartz) and graphite single crystal substrates was investigated by AFM, STM and XPS. When dipped into aqueous colloid solutions at 20oC Pt-col particles and excess shell molecules are adsorbed onto these substrates. After annealing in vacuum at 500oC the organic shell around the Pt colloids is decomposed for all supports used, and atomic force microscopy (AFM) images showed individual, sphere-shaped species on the alumina support, which are randomly distributed over the surface. They are attributed to Pt articles encapsulated by a carbonaceous shell. Oxidation in air at 650oC removes this coating and leads to sintering of platinum. For the graphite support, after annealing in vacuum at 500oC large Pt particles are found that are stabilized by step edges on the graphite surface. This observation and the smaller amount of Pt adsorbed on carbon supports signal a stronger interaction of the Pt colloid with the oxide substrates
Cite:
Witek G.
, Noeske M.
, Mestl G.
, Shaikhutdinov S.
, Behm R.J.
Interaction of Platinum Colloids with Single Crystalline Oxide and Graphite Substrates: A Combined AFM, STM and XPS Study
Catalysis Letters. 1996. V.37. N1-2. P.35-39. DOI: 10.1007/BF00813516 WOS Scopus РИНЦ
Interaction of Platinum Colloids with Single Crystalline Oxide and Graphite Substrates: A Combined AFM, STM and XPS Study
Catalysis Letters. 1996. V.37. N1-2. P.35-39. DOI: 10.1007/BF00813516 WOS Scopus РИНЦ
Dates:
Submitted: | Apr 28, 1995 |
Accepted: | Nov 13, 1995 |
Published print: | Mar 1, 1996 |
Identifiers:
Web of science | WOS:A1996TZ51000007 |
Scopus | 2-s2.0-0003023593 |
Elibrary | 13239778 |
Chemical Abstracts | 1996:141548 |
Chemical Abstracts (print) | 124:212942 |
OpenAlex | W2049125015 |