| Budget Amount *help |
¥44,070,000 (Direct Cost: ¥33,900,000、Indirect Cost: ¥10,170,000)
Fiscal Year 2021: ¥6,630,000 (Direct Cost: ¥5,100,000、Indirect Cost: ¥1,530,000)
Fiscal Year 2020: ¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2019: ¥16,770,000 (Direct Cost: ¥12,900,000、Indirect Cost: ¥3,870,000)
Fiscal Year 2018: ¥14,300,000 (Direct Cost: ¥11,000,000、Indirect Cost: ¥3,300,000)
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| Outline of Final Research Achievements |
Based on scanning probe microscopy techniques, we measured mechanical energy dissipation in nano-sized material junctions to evaluate their electrical and mechanical properties. A transmission electron microscope (TEM) holder equipped with a quartz crystal resonator (LER) as a force sensor was developed to observe nanojunctions and to in-situ characterize their mechanical properties; thin gold (Au) or platinum (Pt) wires were stretched between the LER end and the electrode of the TEM holder, which were being observed by the TEM. The equivalent spring constants of individual bonds between the atoms in the ultimate monoatomic chain of Pt nanojunctions were evaluated, and the critical shear stress of Au nanojunctions was evaluated from the energy dissipation measurements. An analysis was also performed to evaluate the surface electronic properties from the dissipation energy measurements.
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