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Understanding image contrast formation in TiO.sub.2./sub. with force spectroscopy
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SYSNO ASEP 0386566 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Understanding image contrast formation in TiO2 with force spectroscopy Author(s) Yurtsever, A. (JP)
Fernandez-Torre, D. (ES)
González, C. (ES)
Jelínek, Pavel (FZU-D) RID, ORCID
Pou, P. (ES)
Sugimoto, Y. (JP)
Abe, M. (JP)
Pérez, R. (ES)
Morita, S. (JP)Source Title Physical Review B - ISSN 1098-0121
Roč. 85, č. 12 (2012), "125416-1"-"125416-9"Number of pages 9 s. Language eng - English Country US - United States Keywords DFT ; AFM ; force spectroscopy ; atomic resolution Subject RIV BM - Solid Matter Physics ; Magnetism R&D Projects ME10076 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) CEZ AV0Z10100521 - FZU-D (2005-2011) UT WOS 000301408800006 DOI https://doi.org/10.1103/PhysRevB.85.125416 Annotation Site-specific force measurements on a rutile TiO2(110) surface are combined with first-principles calculations in order to clarify the origin of the force contrast and to characterize the tip structures responsible for the two most common imaging modes. Our force data, collected over a broad range of distances, are only consistent with a tip apex contaminated with clusters of surface material. A flexible model tip terminated with an oxygen explains the protrusion mode. For the hole mode we rule out previously proposed Ti-terminated tips, pointing instead to a chemically inert, OH-terminated apex. These two tips, just differing in the terminal H, provide a natural explanation for the frequent contrast changes found in the experiments. As tip-sample contact is difficult to avoid while imaging oxide surfaces, we expect our tip models to be relevant to interpret scanning probe studies of defects and adsorbates on TiO2 and other technologically relevant metal oxides. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2013
Number of the records: 1