Characterization of organic adsorbates of CdS(10(1)over-bar0) surfaces by SXPS and XANES investigation

The interaction of 10(-5) and 10(-4) M 2-mercaptobenzothiazole (MBT) with C dS(<10(1)over bar 0>) surfaces was investigated using SXPS, S L-2,L-3, C K and N K XANES spectra excited with synchrotron radiation. The interface rea ction is photochemically activated and needs thermal activation. A proposed reaction model includes separated electron-hole pairs as band-gap states. At the surface, chemisorbed MBT and an overlayer of bis-(2-benzothiazolyl)d isulphide (BBTD) were detected. Angular-dependent C K XANES measurements of the adsorbate complex indicate a tilted orientation of the molecular plane s of the adsorbed MBT molecules. (C) 1998 Elsevier Science B.V. All rights reserved.