| 研究実績の概要 |
In this project, we have studied the scattering contribution of the graphene－molecule van der Waals (vdW) complex under various electric fields and the associated vdW bonding retention in the complex. In FY2020, we clarified that contrary to the generally opined view, doping does not always dominate the graphene－molecule vdW complex interaction and the vdW complex interaction only shows doping-dominated interaction at zero electric fields while scattering increases with electric field modulation. The “vdW bonding memory” phenomenon was also discovered, and we concluded that it results from the high binding energies of the vdW complexes, which are an order of magnitude higher than the sensing measurement thermal energy.
As the final main achievement, we developed a new method to distinguish various gas via the tuning voltage induced charge transfer characteristics. The charge neutrality point difference was observed in various environments: dry air, 100% N2 and 100% O2, Ammonia/N2, and (84 ppm, 5ppb) Ammonia/Real Air, and shown to be characteristic of each environment.
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