AVS 47th International Symposium
    Surface Science Friday Sessions
       Session SS+MC-FrM

Paper SS+MC-FrM1
Characterisation and Microreactor Studies of Nanofabricated Model Pt/Ceria Catalysts

Friday, October 6, 2000, 8:20 am, Room 209

Session: Characterization of Oxides and Thin Films
Presenter: C. Werdinius, Chalmers University of Technology, Sweden
Authors: C. Werdinius, Chalmers University of Technology, Sweden
O. Hjortsberg, Volvo Technological Development Corporation, Sweden
L. Österlund, Chalmers University of Technology, Sweden
B. Kasemo, Chalmers University of Technology, Sweden
Correspondent: Click to Email
In modern automotive catalysts, ceria is an important component for transient storage and release, respectively, of oxygen during lean and rich conditions. In order to study the detailed kinetics of the oxygen storage, well-characterised samples are required. Model catalysts (1 cm@super 2@ sample area) of platinum particles on ceria were nano-fabricated by a novel method called "colloidal lithography".@footnote 1@ Its principal feature is the ability of fast parallel fabrication of almost mono-sized, evenly distributed nano-particles. The manufacturing consists of the following steps; (i) deposit a ceria film on a silicon wafer, (ii) deposit a Pt film of desired thickness, (iii) deposit an array of colloidal particles of desired size and spatial separation, (iv) remove all Pt not shadowed by the particles, using Ar-ion beam etching, (v) remove the particles. The final step leaves an array of Pt particles with size and separation reflecting the colloidal particle size and separation. Samples with different Pt-particle densities and particle sizes (40 and 110 nm) were made, and characterised by several surface analytical techniques, including SEM and XPS. Preliminary results of pulsed CO oxidation experiments in a specially designed microreactor are presented, along with vacuum CO TPD measurements. @FootnoteText@ @footnote 1@ P. Hanarp, D. Sutherland, J. Gold, and B. Kasemo, Nanostructured Materials 12, 429-432 (1999).