[2C01-08] Surface Analysis/Applied Surface Science/Evaluation Technique (ASS)

11:30 AM - 11:45 AM JST(2:30 AM - 2:45 AM UTC)

[2C08] Polarizability measurement for a giant polyoxometalate molecule by Fowler-Nordheim tunneling spectroscopy

*Tomoki Misaka¹, Masahiro Nakayama¹, Yuma Kondo¹, Hiroshi Ohyoyama¹, Takuya Matsumoto^1,2 (1. Graduate School of Science, Osaka University (Japan), 2. Kyushu Institute of Technology (Japan))

Electrostatic force microscopy (EFM), based on atomic force microscopy techniques, is a powerful method for visualizing nanoscale distributions of electrostatic forces. We developed Fowler-Nordheim (FN) tunneling spectroscopy based on the EFM technique, which provides localized information on molecular multilayer energy-level alignment and the polarizability of a single molecule through a combination of capacitance measurements based on EFM under low electrostatic fields and tunneling-current measurements under high electric fields. In this study, we demonstrate that FN tunneling spectroscopy allows us to evaluate the polarizability of a giant polyoxometalate (POM) molecule - too large for conventional theoretical calculations - by analyzing its tunneling characteristics. The polarizability of the POM was evaluated to be approximately 9.3 × 10^-38 C² m² J^-1.

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