[19a-C304-1~4] 22.1 Joint Session M "Phonon Engineering"

▲ [19a-C304-3] [INVITED] Active heat flow control in monolayer graphene

〇Haidong Wang^1,2, Hiroshi Takamatsu², Koji Takahashi², Xing Zhang¹ (1.Tsinghua Univ., 2.Kyushu Univ.)

Keywords:graphene, thermal conductivity, thermal rectification

Active heat flow control has a wide application in self-standing thermal computer, efficient energy harvesting, smart thermal management, etc. People have been designing different kinds of devices and systems to achieve this goal. In this talk, I would like to introduce recent progress in active heat flow control by using 2D materials. We have fabricated asymmetric nano-structures in suspended monolayer graphene ribbon by using nano-manufacturing techniques, such as FIB, EBID, etc. The asymmetric nanopores or nanoparticles alter the phonon transport in graphene. Hence, the thermal conductivity of graphene ribbon is changed by reversing the heat flow direction. The result demonstrates that the thermal rectification behavior is more significant in graphene than in other 1D material. The highest rectification factor is 28% in graphene, while the previous reported value in carbon nanotube is only 7%. The underlying physics of thermal rectification is explained by using large-scale MD simulation.