AVS 60th International Symposium and Exhibition
    Surface Science Friday Sessions
       Session SS-FrM

Paper SS-FrM4
Atomic Structure of the Anatase TiO2(001) Surface

Friday, November 1, 2013, 9:20 am, Room 201 A

Session: Oxides and Semiconductors: Structure and Reactivity
Presenter: Z. Zhang, Baylor University
Authors: Y. Xia, Baylor University
K. Zhu, Baylor University
T.C. Kaspar, Pacific Northwest National Laboratory
B. Birmingham, Baylor University
K.T. Park, Baylor University
Z. Zhang, Baylor University
Correspondent: Click to Email
Understand the atomic surface structure of well-defined anatase TiO2(001) surface is critical for deciphering site-specific thermal and photo- reaction mechanisms on anatase TiO2 — the most reactive polymorph of TiO2. We have studied anatase TiO2(001) epitaxial thin films grown ex-situ by oxygen-plasma-assisted molecular beam epitaxy using UHV scanning tunneling microscopy (STM). Large (~30 nm) coexisting (4×1) and (1×4) reconstructed terraces are observed. The atomic corrugation on bright rows of the surface shows a strong bias voltage dependence and is not uniform. High resolution images resolve the atomic structure of the bright row. We propose a modified ad-molecule model for the anatase TiO2 (001) surface structure.