Adsorption of L-cysteine and co-adsorption of L-cysteine and Au on a rutile TiO 2 (110) surface Evren Ataman, Cristina Isvoranu, Jesper Andersen, Joachim.

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Presentation transcript:

Adsorption of L-cysteine and co-adsorption of L-cysteine and Au on a rutile TiO 2 (110) surface Evren Ataman, Cristina Isvoranu, Jesper Andersen, Joachim Schnadt

Motivations Interaction of metal oxide surfaces with biological molecules is interesting from both a fundamental point of view and technological applications. Cysteine might be a candidate to stabilize the gold cluster to keep high the efficiency of catalysis of oxidation.

Cysteine is an amino acid which is the only one has a thiol group. Sulfur strongly interacts with gold.

RUTILE TiO 2 (110) Defects: Missing Bridging O atoms (5-10%) Missing Ti atoms (rare)

A. Kiejna, T. Pabisiak S. W. Gao J. Phys.: Condens. Matter 18 (2006)

Core Level X-Ray Photoelectron Spectra

TiO 2 -cysteine-gold vs. TiO 2 -gold-cysteine

More Gold Deposition On Cysteine Deposited Surface Increasing Gold Coverage

CONCLUSIONS -We propose a model for interaction of cysteine with TiO 2 surface. -We investigated TiO 2 / Gold / Cysteine structure (work on adsorption of CO in progress). -Supporting experimental work and theoretical calculation are required for a detailed model of structure.

Jesper Andersen Joachim Schnadt Cristina Isvoranu Acknowledgments