Ambient effects on electric-field-induced local charge modification of TiO 2

Haeri Kim; Seungbum Hong; Dong Wook Kim

doi:10.1063/1.3675630

Ambient effects on electric-field-induced local charge modification of TiO ₂

Haeri Kim, Seungbum Hong, Dong Wook Kim

Department of Physics

Research output: Contribution to journal › Article › peer-review

26 Scopus citations

Abstract

We investigated the surface potential of TiO ₂ single crystals using scanning probe microscopy (SPM) under different gas environment. The SPM tip-induced electrical stress resulted in reversal in the surface potential, V _surf, polarity only in H ₂/Ar (ΔV _surf 0.30 eV) and not in Ar and O ₂. Quantitative measurement of the influence of ambient gas on the surface potential led us to develop a model where the adsorbed oxygen molecules and oxygen vacancies interact to change their relative concentration leading to different surface potential in TiO ₂. These results will give us insights into ambient-dependent physical phenomena in oxide thin film nanostructures.

Original language	English
Article number	022901
Journal	Applied Physics Letters
Volume	100
Issue number	2
DOIs	https://doi.org/10.1063/1.3675630
State	Published - 9 Jan 2012

Bibliographical note

Funding Information:
H.K. and D.-W.K. were supported by the Quantum Metamaterials Research Center (2009-0063324) and the Basic Research Program (2010-0009344) through the National Research Foundation of Korea Grant funded by the Korean Ministry of Education, Science, and Technology. The SPM experiments and data analysis (H.K. and S.H.) were conducted at the Materials Science Division of Argonne National Laboratory, a U.S. DOE Office of Science Laboratory, operated under Contract No. DE-AC02-06CH11357.

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10.1063/1.3675630

Cite this

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title = "Ambient effects on electric-field-induced local charge modification of TiO 2 ",

abstract = "We investigated the surface potential of TiO 2 single crystals using scanning probe microscopy (SPM) under different gas environment. The SPM tip-induced electrical stress resulted in reversal in the surface potential, V surf, polarity only in H 2/Ar (ΔV surf 0.30 eV) and not in Ar and O 2. Quantitative measurement of the influence of ambient gas on the surface potential led us to develop a model where the adsorbed oxygen molecules and oxygen vacancies interact to change their relative concentration leading to different surface potential in TiO 2. These results will give us insights into ambient-dependent physical phenomena in oxide thin film nanostructures.",

author = "Haeri Kim and Seungbum Hong and Kim, {Dong Wook}",

note = "Funding Information: H.K. and D.-W.K. were supported by the Quantum Metamaterials Research Center (2009-0063324) and the Basic Research Program (2010-0009344) through the National Research Foundation of Korea Grant funded by the Korean Ministry of Education, Science, and Technology. The SPM experiments and data analysis (H.K. and S.H.) were conducted at the Materials Science Division of Argonne National Laboratory, a U.S. DOE Office of Science Laboratory, operated under Contract No. DE-AC02-06CH11357.",

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