| AVS 54th International Symposium | |
| Surface Science | Tuesday Sessions |
| Session SS-TuP |
| Session: | Surface Science Poster Session |
| Presenter: | S. Yagi, Nagoya University, Japan |
| Authors: | S. Yagi, Nagoya University, Japan O. Sumi, Nagoya University, Japan T. Nomoto, Nagoya University, Japan K. Soda, Nagoya University, Japan H. Namatame, Hiroshima University, Japan M. Taniguchi, Hiroshima University, Japan |
| Correspondent: | Click to Email |
It is an important reaction that water molecule plays some interaction in the bio-body. There are many sulfur-including molecules in the bio-body, such as L-cysteine amino acid. Is there any interaction between the sulfur-including molecule and water? We have pay attention to the interaction of the co-adsorption system, the sulfur-including molecule and water, on the transition metal surface. For the bio amino molecule of L-cysteine, it is reported that the L-cysteine molecule has an interaction with water molecule on transition metal surface.1 For the adsorbate of L-cysteine on NI and Cu surfaces, the S-H bond dissociates and becomes thiolate form. It is found that the oo-adsorbed water molecule has a new bonding with the sulfur of the thiolate. Because the Sulfur K-edge Near-edge X-ray Absorption Fine Structure (NEXAFS) shows sigma*(S-O) peak at 2482 eV. It seems that there are bondings of three or four water molecules at the sulfur part of the thiolate. The adsorption systems of dimethyl sulfide (DMS) and dimethyl disulfide (DMDS) on Rh(100) surface have been investigated by T. Nomoto2,3 and O. Sumi4 by XPS and NEXAFS. For both adsorption systems, the adsorption molecules partly dissociates and becomes thiolate and atomic sulfur on the surface at 90 K. In this paper, the aim is to reveal the co-adsorption reaction of DMDS and water molecules on Rh(100) at 90 K by means of XPS and Sulfur K-edge NEXAFS techniques. Judging from the spectral results of XPS and NEXAFS, it is found that DMDS molecules partly dissociate and the adsorbates are the thiolate and atomic sulfur. In case of the co-adsorption with water, it is cleared that water molecule does not have an interaction with the atomic sulfur, but has a bonding with the thiolate.
1S. Yagi et al., Surf. Interface Anal., 36 (2004) 1064.
2T.Nomoto et al., e-J. Surf. Sci. Nanotech., 4 (2006) 39.
3T. Nomoto et al., J. Surf. Anal., 12 (2005) 238
4O. Sumi et al., submitted to the conference of AVS-54, Seattle (2007).