講演情報
[18p-A36-7]Graphene phononic devices for thermal rectification with He Ion beam technology
〇Fayong Liu1, Kaidi Sun1, Qianyu Jia1, Haiyong Zheng1, Manoharan Muruganathan2, Hiroshi Mizuta2 (1.Ocean Univ. of China, 2.JAIST)
キーワード：
graphene-based phononic device、Helium ion beam milling、thermal management
Graphene is one of the most famous representations of two-dimensional materials with its super physical and chemical properties. With the helium ion beam milling (HIBM) technique, the original graphene structure is artificially modified with a nanometer periodical configuration. It forms a 2D phononic crystal structure for phonon engineering to control the phonon transmission with artificial nanostructures. As the phononic crystals introduce the asymmetry in a suspended graphene ribbon, the thermal rectification phenomenon has been observed and investigated.
In this talk, we will demonstrate the graphene nanostructure fabrication processes with the HIBM technique by coupling it with advanced graphene Nano-Electromechanical System (NEMS) technology. It includes how to reshape the suspended graphene ribbon and pattern periodical nanopores with a 6 nm diameter on a graphene ribbon. With the established experience above, asymmetric graphene phononic crystal structures are introduced on a suspended graphene ribbon. With the help of a differential thermal leakage method, the thermal rectification phenomenon is observed with up to 60% thermal rectification ratio at 150 K.
In order to understand the mechanism of thermal rectification on graphene phononic devices, we deeply investigate the phonon transport behavior from each part of the device composition, especially the graphene-gold interface and asymmetric graphene structures. We use both the molecular dynamics simulation method and the finite element method to investigate the wave properties of the phonon, and found that each part of the device composition gives different weights of the contributions for the thermal rectification phenomenon. This work provides both experimental and theoretical support for further developing graphene-based thermal management devices.
In this talk, we will demonstrate the graphene nanostructure fabrication processes with the HIBM technique by coupling it with advanced graphene Nano-Electromechanical System (NEMS) technology. It includes how to reshape the suspended graphene ribbon and pattern periodical nanopores with a 6 nm diameter on a graphene ribbon. With the established experience above, asymmetric graphene phononic crystal structures are introduced on a suspended graphene ribbon. With the help of a differential thermal leakage method, the thermal rectification phenomenon is observed with up to 60% thermal rectification ratio at 150 K.
In order to understand the mechanism of thermal rectification on graphene phononic devices, we deeply investigate the phonon transport behavior from each part of the device composition, especially the graphene-gold interface and asymmetric graphene structures. We use both the molecular dynamics simulation method and the finite element method to investigate the wave properties of the phonon, and found that each part of the device composition gives different weights of the contributions for the thermal rectification phenomenon. This work provides both experimental and theoretical support for further developing graphene-based thermal management devices.
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