Journal
NANOTECHNOLOGY
Volume 21, Issue 40, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/21/40/405702
Keywords
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Funding
- Spanish CYCIT [MAT2008-1497]
- Ministry of Science and Innovation [CSD2007-41 NANOSELECT]
- Ministerio de Educacion [AP2005-0433 FPU]
- Spanish Ministerio de Ciencia e Innovacion [2007-0034]
- CSIC JAE-Doc
- FSE
- CSIC-Czech Academy of Science [2008CZ25]
- GAAV [IAA 100100905]
- GA CR [202/09/0545]
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We present a combination of experimental STM images and DFT calculations to understand the atomic scale contrast of features found in high-resolution STM images. Simulating different plausible structural models for the tip, we have been able to reproduce various characteristics previously reported in experimental images on TiO2(110)-(1 x 1) under controlled UHV conditions. Our results allow us to determine the influence of different chemical and morphological tip terminations on the atomic-resolution STM images of the TiO2(110)-(1 x 1) surface. The commonest images have been properly explained using standard models for a W tip, either clean or with a single O atom located at the apex. Furthermore, a double transfer of oxygen atoms can account for different types of bizarre atomic-resolution features occasionally seen, and not conclusively interpreted before. Importantly, we discuss how typical point-defects are imaged on this surface by different tips, namely bridging O vacancies and adsorbed OH groups.
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