Electrical conductivities of nanosheets studied by conductive atomic force microscopy

Neval Yilmaz, Shintaro Ida, Yasumichi Matsumoto

    Research output: Contribution to journalArticlepeer-review

    10 Citations (Scopus)

    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

    All Science Journal Classification (ASJC) codes

    • Materials Science(all)
    • Condensed Matter Physics

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