Scanning Tunneling Microscopy Visualization of Polaron Charge Trapping by Hydroxyls on TiO 2 (110).

Autor: Yim CM; Department of Chemistry and London Centre for Nanotechnology, University College London, 20 Gordon Street, London WC1H 0AJ, U.K.; Tsung Dao Lee Institute and School of Physics and Astronomy, Shanghai Jiao Tong University, 1 Lisuo Road, Shanghai 201210, China., Allan M; Department of Chemistry and London Centre for Nanotechnology, University College London, 20 Gordon Street, London WC1H 0AJ, U.K., Pang CL; Department of Chemistry and London Centre for Nanotechnology, University College London, 20 Gordon Street, London WC1H 0AJ, U.K., Thornton G; Department of Chemistry and London Centre for Nanotechnology, University College London, 20 Gordon Street, London WC1H 0AJ, U.K.
Jazyk: angličtina
Zdroj: The journal of physical chemistry. C, Nanomaterials and interfaces [J Phys Chem C Nanomater Interfaces] 2024 Aug 08; Vol. 128 (33), pp. 14100-14106. Date of Electronic Publication: 2024 Aug 08 (Print Publication: 2024).
DOI: 10.1021/acs.jpcc.4c03751
Abstrakt: Using scanning tunneling microscopy (STM), we investigate the spatial distribution of the bridging hydroxyl (OH b ) bound excess electrons on the rutile TiO 2 (110) surface and its temperature dependence. By performing simultaneously recorded empty and filled state imaging on single OH b s at different temperatures in STM, we determine that the spatial distribution of the OH b bound excess electrons retains a symmetric four-lobe structure around the OH b at both 78 and 7 K. This indicates that OH b s are much weaker charge traps compared to bridging O vacancies (O b -vac). In addition, by sequentially removing the capping H of each OH b using voltage pulses, we find that the annihilation of each OH b is accompanied by the disappearance of some lobes in the filled state STM, thus verifying the direct correlation between OH b s and their excess electrons.
Competing Interests: The authors declare no competing financial interest.
(© 2024 The Authors. Published by American Chemical Society.)
Databáze: MEDLINE
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