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Adsorption-site-dependent electronic structure of catechol on the anatase TiO2(101) surface.
- Source :
-
Langmuir : the ACS journal of surfaces and colloids [Langmuir] 2011 Jul 19; Vol. 27 (14), pp. 8600-4. Date of Electronic Publication: 2011 Jun 23. - Publication Year :
- 2011
-
Abstract
- The adsorption of catechol (1,2-benzendiol) on the anatase TiO(2)(101) surface was studied with synchrotron-based ultraviolet photoemission spectroscopy (UPS), X-ray photoemission spectroscopy (XPS), and scanning tunneling microscopy (STM). Catechol adsorbs with a unity sticking coefficient and the phenyl ring intact. STM reveals preferred nucleation at step edges and subsurface point defects, followed by 1D growth and the formation of a 2 × 1 superstructure at full coverage. A gap state of ∼1 eV above the valence band maximum is observed for dosages in excess of ∼0.4 Langmuir, but such a state is absent for lower coverages. The formation of the band gap states thus correlates with the adsorption at regular lattice sites and the onset of self-assembled superstructures.
Details
- Language :
- English
- ISSN :
- 1520-5827
- Volume :
- 27
- Issue :
- 14
- Database :
- MEDLINE
- Journal :
- Langmuir : the ACS journal of surfaces and colloids
- Publication Type :
- Academic Journal
- Accession number :
- 21688795
- Full Text :
- https://doi.org/10.1021/la201553k