title: In-situ measurement of the heat transport in defect- engineered free-standing single-layer graphene.
abstract: Utilizing nanomachining technologies, it is possible to manipulate the heat transport in graphene by introducing different defects. However, due to the difficulty in suspending large-area single-layer graphene (SLG) and limited temperature sensitivity of the present probing methods, the correlation between the defects and thermal conductivity of SLG is still unclear. In this work, we developed a new method for fabricating micro-sized suspended SLG. Subsequently, a focused ion beam (FIB) was used to create nanohole defects in SLG and tune the heat transport. The thermal conductivity of the same SLG before and after FIB radiation was measured using a novel T-type sensor method on site in a dual-beam system. The nanohole defects decreased the thermal conductivity by about 42%. It was found that the smaller width and edge scrolling also had significant restriction on the thermal conductivity of SLG. Based on the calculation results through a lattice dynamics theory, the increase of edge roughness and stronger scattering on long-wavelength acoustic phonons are the main reasons for the reduction in thermal conductivity. This work provides reliable data for understanding the heat transport in a defective SLG membrane, which could help on the future design of graphene-based electrothermal devices.
authors.affiliation: Department of Mechanical Engineering, Kyushu University, Fukuoka, 8190395, Japan.
authors.forename: Haidong
authors.initials: H
authors.lastname: Wang
authors.affiliation: Department of Mechanical Engineering, Kyushu University, Fukuoka, 8190395, Japan.
authors.forename: Kosaku
authors.initials: K
authors.lastname: Kurata
authors.affiliation: Department of Mechanical Engineering, Kyushu University, Fukuoka, 8190395, Japan.
authors.forename: Takanobu
authors.initials: T
authors.lastname: Fukunaga
authors.affiliation: Department of Mechanical Engineering, Kyushu University, Fukuoka, 8190395, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Takamatsu
authors.affiliation: Department of Engineering Mechanics, Tsinghua University, Beijing, 100084, China.|International Institute for Carbon-Neutral Energy Research, Kyushu University, Fukuoka, 8190395, Japan.
authors.forename: Xing
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Department of Aeronautics and Astronautics, Kyushu University, Fukuoka, 8190395, Japan.
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Ikuta
authors.affiliation: Department of Aeronautics and Astronautics, Kyushu University, Fukuoka, 8190395, Japan.
authors.forename: Koji
authors.initials: K
authors.lastname: Takahashi
authors.affiliation: Department of Aeronautics and Astronautics, Kyushu University, Fukuoka, 8190395, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Nishiyama
authors.affiliation: Institute for Materials Chemistry and Engineering, Kyushu University, Fukuoka, 8168580, Japan.
authors.forename: Hiroki
authors.initials: H
authors.lastname: Ago
authors.affiliation: International Institute for Carbon-Neutral Energy Research, Kyushu University, Fukuoka, 8190395, Japan.
authors.forename: Yasuyuki
authors.initials: Y
authors.lastname: Takata