CHARACTERISATION OF INTERFACIAL BONDING AND PHOTOCHEMISTRY IN SELF-ASSEMBLED THIOL MONOLAYERS ON GOLD USING NEXAFS AND ARUPS

H. Rieley, N.J. Price, R.G. White, R.I.R. Blyth, L. Håkansson and A.W. Robinson
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H. Rieley: Department of Chemistry, University of Liverpool, P.O. Box 147, Liverpool L69 3BX, UK
N.J. Price: Department of Chemistry, University of Liverpool, P.O. Box 147, Liverpool L69 3BX, UK
R.G. White: Department of Physics and Surface Science Research Centre, University of Liverpool, P.O. Box 147, Liverpool L69 3BX, UK
R.I.R. Blyth: Surface Science Research Centre, University of Liverpool, P.O. Box 147, Liverpool L69 3BX, UK
L. Håkansson: Surface Science Research Centre, University of Liverpool, P.O. Box 147, Liverpool L69 3BX, UK
A.W. Robinson: Surface Science Research Centre, University of Liverpool, P.O. Box 147, Liverpool L69 3BX, UK

Surface Review and Letters (SRL), 1994, vol. 01, issue 04, 701-704

Abstract: S K-edge near-edge X-ray absorption fine structure (NEXAFS) has been used to establish the oxidation state of S in self-assembled monolayers (SAMs) of heptane and octane thiols, RSH[R=CH3(CH2)n, n=6, 7]and the analogous halo-alkane disulphides,[(XRS)2, X=Cl,Br]derivatisedex situon Au foil. We find that the initially prepared surface thiolate species(RS–)is photo-oxidised by X-radiation, in the presence of coadsorbed oxygen, to sulphonate$\left( {{\rm{RSO}}_3^ - } \right)$. Angle-resolved UV photoemission (ARUPS) has been used to further characterise the nature of the S-Au interaction in these SAMs following their preparation in UHV on Au(111). The ARUPS results suggest the involvement of the Aud-bands in the S-Au bond.

Date: 1994
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DOI: 10.1142/S0218625X94000989

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