期刊
SURFACE SCIENCE
卷 603, 期 9, 页码 1253-1261出版社
ELSEVIER
DOI: 10.1016/j.susc.2009.03.014
关键词
Near edge X-ray absorption fine structure (NEXAFS); X-ray photoelectron spectroscopy (XPS); Synchrotron radiation; Chiral surface; Amino acid; Copper; Enantioselectivity; Self assembly
资金
- ASRP (Australian Synchrotron Research Program) [G0188159]
- EPSRC (Engineering and Physical Sciences Research Program) [GR/S85528/01]
- European Community [R II 3-CT-2004-506008]
- Australian Institute of Nuclear Science
- Engineering (AINSE) fellowship scheme
- Nuffield Foundation
- Engineering and Physical Sciences Research Council [GR/S85528/01] Funding Source: researchfish
The adsorption of L-CySteine and L-methionine amino acids on a chiral Cu{5 3 1} surface was investigated with high resolution X-ray photoelectron spectroscopy (XPS) and carbon K-edge near edge X-ray absorption fine structure (NEXAFS) Spectroscopy using synchrotron radiation. XPS shows that at 300 K L-cysteine adsorbs through two oxygen, a nitrogen and a sulfur atom, in a four point 'quadrangular footprint', whereas L-methionine adsorbs through only two oxygen and a nitrogen atom in a 'triangular footprint'. NEWS was used to clarify the adsorption geometry of both molecules, which suggests a binding orientation to the top layer and second layer atoms in two different orientations associated with adsorption sites on {1 1 0} and {3 1 1} microfacets; of the Cu{5 3 1} surface. (C) 2009 Elsevier B.V. All rights reserved.
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