Atomic-resolution imaging of rutile TiO2 (110) - (1 × 2) reconstructed surface by non-contact atomic force microscopy

Katsube, D.; Ojima, S.; Inami, E.; Abe, M.

Beilstein Journal of Nanotechnology 11: 443-449


ISSN/ISBN: 2190-4286
PMID: 32215231
DOI: 10.3762/bjnano.11.35
Accession: 069952864

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The structure of the rutile TiO2(110)-(1 × 2) reconstructed surface is a phase induced by oxygen reduction. There is ongoing debate about the (1 × 2) reconstruction, because it cannot be clarified whether the (1 × 2) structure is formed over a wide area or only locally using macroscopic analysis methods such as diffraction. We used non-contact atomic force microscopy, scanning tunneling microscopy, and low-energy electron diffraction at room temperature to characterize the surface. Ti2O3 rows appeared as bright spots in both NC-AFM and STM images observed in the same area. High-resolution NC-AFM images revealed that the rutile TiO2(110)-(1 × 2) reconstructed surface is composed of two domains with different types of asymmetric rows.