Electrical conductivities of nanosheets studied by conductive atomic force microscopy

Neval Yilmaz, Shintaro Ida, Yasumichi Matsumoto

Research output: Contribution to journalArticle

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Abstract

The electrical conductivities of single nanosheets of titanium oxide (TiO2), manganese oxide (MnO2), 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 TiO2, GdEuTiO, and NbO nanosheets showed asymmetric (rectifying) current/voltage (I/V)-profiles, those for the MnO2 and GO nanosheets were symmetric (nonrectifying). The differences in the I/V-profile indicated that the dominant electron transfer mechanism in case of TiO2, GdEuTiO, and NbO nanosheets was tunneling under reverse bias like an n-type semiconductor and that for MnO2 and GO nanosheets, having a defected structure, was hopping. Among all these nanosheets, MnO2 exhibited the highest conductivity.

Original languageEnglish
Pages (from-to)62-66
Number of pages5
JournalMaterials Chemistry and Physics
Volume116
Issue number1
DOIs
Publication statusPublished - Jul 15 2009

Fingerprint

niobium oxides
Nanosheets
Atomic force microscopy
graphite
atomic force microscopy
titanium oxides
electrical resistivity
Niobium oxide
oxides
Graphite
n-type semiconductors
Oxides
manganese oxides
electric potential
profiles
electron transfer
conduction
conductivity
electrodes
Manganese oxide

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Electrical conductivities of nanosheets studied by conductive atomic force microscopy. / Yilmaz, Neval; Ida, Shintaro; Matsumoto, Yasumichi.

In: Materials Chemistry and Physics, Vol. 116, No. 1, 15.07.2009, p. 62-66.

Research output: Contribution to journalArticle

Yilmaz, Neval ; Ida, Shintaro ; Matsumoto, Yasumichi. / Electrical conductivities of nanosheets studied by conductive atomic force microscopy. In: Materials Chemistry and Physics. 2009 ; Vol. 116, No. 1. pp. 62-66.
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