Universal Phenomena of CO Adsorption on Gold Surfaces with Low-Coordinated Sites

Autor:	Wai-Leung Yim, Tobias Nowitzki, Patricia Nickut, and Thorsten Klüner, Mandus Necke, Jürgen Biener, Monika M. Biener, Marcus Bäumer, Volkmar Zielasek, Hanno Schnars, Katharina Al-Shamery
Rok vydání:	2006
Předmět:	Argon Infrared Analytical chemistry Infrared spectroscopy Nanoparticle chemistry.chemical_element Surfaces Coatings and Films Electronic Optical and Magnetic Materials Catalysis General Energy Adsorption chemistry Desorption Physical and Theoretical Chemistry Spectroscopy
Zdroj:	The Journal of Physical Chemistry C. 111:445-451
ISSN:	1932-7455 1932-7447
DOI:	10.1021/jp0665729
Popis:	Since Au turned out to be an active catalyst for CO oxidation at low temperatures, CO adsorption on various Au surfaces has been in the scope of numerous surface science studies. Interestingly, supported particles as well as stepped and rough single-crystal surfaces exhibit very similar adsorption behavior. To elucidate the origin of these similarities, we have performed temperature-programmed desorption and infrared absorption spectroscopy for a whole range of Au surfaces from nanoparticles grown on HOPG to Au(111) surfaces roughened by argon ion bombardment. In line with previous results, we have observed two desorption states at ∼130−145 and ∼170−185 K, respectively, and one infrared peak at around 2120 cm-1 in all cases. In addition to the experiments, we have carried out theoretical studies of CO adsorption on Au(332). The calculations show that CO desorption states above 100 K may be located at step-edges but not on terrace sites. Reducing the coordination of Au atoms further leads to successively h...
Databáze:	OpenAIRE
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