Adsorption and stability of malonic acid on rutile TiO2 (110), studied by near edge X-ray absorption fine structure and photoelectron spectroscopy

Syres, Karen orcid iconORCID: 0000-0001-7439-475X, Thomas, Andrew G., Graham, Darren M., Spencer, Ben F., Flavell, Wendy R., Jackman, Mark J. and Dhanak, Vinod R. (2014) Adsorption and stability of malonic acid on rutile TiO2 (110), studied by near edge X-ray absorption fine structure and photoelectron spectroscopy. Surface Science, 626 . pp. 14-20. ISSN 00396028

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Official URL: http://dx.doi.org/10.1016/j.susc.2014.03.015

Abstract

The adsorption of malonic acid on rutile TiO2 (110) has been studied using photoelectron spectroscopy and C K-edge, near edge X-ray fine structure spectroscopy (NEXAFS). Analysis of the O 1s and Ti 2p spectra suggest that the molecule adsorbs dissociatively in a doubly-bidentate adsorption geometry as malonate. The data are unable to distinguish between a chelating bonding mode with the backbone of the molecule lying along the [001] azimuth or a bridging geometry along the direction. Work carried out on a wiggler beamline suggests that the molecule is unstable under irradiation by high-flux synchrotron radiation from this type of insertion device.


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