期刊
MATERIALS CHEMISTRY AND PHYSICS
卷 116, 期 1, 页码 62-66出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2009.02.043
关键词
Nanostructures; Oxides; Atomic force microscopy (AFM); Electrical conductivity
资金
- Japan Society for the Promotion of Science [19205025]
- Grants-in-Aid for Scientific Research [19205025] Funding Source: KAKEN
The electrical conductivities of single nanosheets of titanium oxide (TiO(2)), manganese oxide (MnO(2)), double-layered titanium perovskite oxide (GdEuTiO), niobium oxide (NbO), and graphite oxide (GO) adsorbed on HOPG were studied by conductive atomic force microscopy (C-AFM) with a Pt-Ir tip. The conduction mechanism for different types of nanosheets could be clarified by using electrodes (HOPG and Pt-Ir tip) having different work functions. While the TiO(2), GdEuTiO, and NbO nanosheets showed asymmetric (rectifying) current/voltage (I/V)-profiles, those for the MnO(2) and GO nanosheets; were symmetric (nonrectifying). The differences in the I/V-profile indicated that the dominant electron transfer mechanism in case of TiO(2), GdEuTiO, and NbO nanosheets was tunneling under reverse bias like an n-type semiconductor and that for MnO(2) and GO nanosheets, having a defected structure, was hopping. Among all these nanosheets, MnO(2) exhibited the highest conductivity. (C) 2009 Elsevier B.V. All rights reserved.
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