Proceedings of nanoGe September Meeting 2017 (NFM17)
Publication date: 20th June 2016
TiO2 has been intensively studied in a range of application such as solar energy conversion and photocatalysis [1]. Among different polymorphs, anatase TiO2 is generally considered as a superior photocatalyst due to its longer carrier lifetime and higher electron mobility [2]. Since the crystallographic orientation and the surface termination of metal oxides determine the electronic properties, there has been an increasing interest in the fundamental physical properties of single crystalline anatase. Ohno et al. [3] discovered the selective deposition of Pt and PbO2 on the specific orientations of rutile and anatase via photo-deposition, indicating that the faces help in the separation of photoinduced electrons and holes. The result suggests that anatase (101) provides the effective reduction site whereas anatase (001) work as the oxidation site. Despite of the importance of crystal facets, the information on the electronic properties of single crystal anatase is sparse. Especially work function plays a crucial role in electrochemical reactions as its value governs the energy junction at the interface of metal/anatase, semiconductor/anatase, and electrolyte/anatase. In this work, we performed in-situ Ultraviolet photoelectron spectroscopy to determine the work function of the anatase (001) and (101) facet in different surface states. A range of variation for obtained work function was about 2 eV between 4.5 and 6.5 eV. Our results suggest that a surface preparation has to be taken into account considerably as the value of work function drastically varies on the surface states, and could provide a practical information in terms of the energy band alignment of anatase interfaces.
[1] DIEBOLD, Ulrike. Surface science reports, 2003, 48.5: 53-229.
[2] SELCUK, Sencer; SELLONI, Annabella. Nature Materials, 2016, 15.10: 1107-1112.
[3] OHNO, Teruhisa; SARUKAWA, Koji; MATSUMURA, Michio. New journal of chemistry, 2002, 26.9: 1167-1170.
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