| Budget Amount *help |
¥44,330,000 (Direct Cost: ¥34,100,000、Indirect Cost: ¥10,230,000)
Fiscal Year 2021: ¥8,580,000 (Direct Cost: ¥6,600,000、Indirect Cost: ¥1,980,000)
Fiscal Year 2020: ¥9,880,000 (Direct Cost: ¥7,600,000、Indirect Cost: ¥2,280,000)
Fiscal Year 2019: ¥11,570,000 (Direct Cost: ¥8,900,000、Indirect Cost: ¥2,670,000)
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 |
By using focused Helium ion beam milling, a new nanofabrication technology was built to pattern graphene phononic crystal (GPnC) with nanopores of 3 - 6 nm in diameter and pitch less than 25 nm on a suspended graphene channel. An asymmetric phoninc device was fabricated by patterning GPnC into only a half of a 500-nm-long and 1200-nm-wide graphene channel. A new Differential Thermal Leakage method was developed to measure thermal transport properties at nanoscale and applied to evaluate the fabricated asymmetric GPnC devices. Thermal rectifying phenomena were observed with a higher thermal conductance when a heater was placed on the GPnC side, resulting in a thermal rectification ratio of over 60 % at 250 K.
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