Pyrocatechol as a surface capping molecule on raffle TiO2 (110)

SURFACE SCIENCE

卷:606

Article

Syres, K. L.¹  Thomas, A. G.¹  Cant, D. J. H.¹  Hardman, S. J. O.¹  Preobrajenski, A.² 

[1] Univ Manchester, Sch Phys & Astron, Photon Sci Inst, Manchester M13 9PL, Lancs, England

[2] Lund Univ, MAX Lab, SE-22363 Lund, Sweden

关键词: Photoemission;    Titanium dioxide;    Single crystal;    Pyrocatechol;    Capping;    N3 dye;   

DOI  :  10.1016/j.susc.2011.10.005

来源: Elsevier

【 摘 要 】

A 'cap and dip' method of adsorbing ruthenium di-2,2'-bipyridy1-4,4'-dicarboxylic acid diisocyanate (N3 dye) on a rutile TiO2 (110) surface was investigated using pyrocatechol as a capping molecule. This method involves cleaning the rutile surface in ultra-high vacuum (UHV), depositing pyrocatechol onto the surface to 'cap' the adsorption sites, removing from vacuum, 'dipping' in an N3 dye solution and returning to vacuum. Photoemission measurements following the return of the crystal to vacuum suggest that the pyrocatechol keeps the surface free from contamination on exposure to atmosphere. Photoemission spectra also indicate that the pyrocatechol capping molecules are replaced by the N3 dye in solution and that the N3 dye is adsorbed intact on the nitile TiO2 (110) surface. This technique may allow other large molecules, which are thermally unstable to evaporation in UHV, to be easily deposited onto TiO2 surfaces. (C) 2011 Elsevier B.V. All rights reserved.

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