In-situ measurement of the heat transport in defect-engineered free-standing single-layer graphene

Haidong Wang, Kosaku Kurata, Takanobu Fukunaga, Hiroshi Takamatsu, Xing Zhang, Tatsuya Ikuta, Koji Takahashi, Takashi Nishiyama, Hiroki Ago, Yasuyuki Takata

Research output: Contribution to journalArticle

20 Citations (Scopus)

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.

Original languageEnglish
Article number21823
JournalScientific reports
Volume6
DOIs
Publication statusPublished - Feb 24 2016

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in situ measurement
graphene
heat
defects
thermal conductivity
ion beams
constrictions
phonons
roughness
membranes
conductivity
acoustics
sensors
scattering
wavelengths

All Science Journal Classification (ASJC) codes

  • General

Cite this

In-situ measurement of the heat transport in defect-engineered free-standing single-layer graphene. / Wang, Haidong; Kurata, Kosaku; Fukunaga, Takanobu; Takamatsu, Hiroshi; Zhang, Xing; Ikuta, Tatsuya; Takahashi, Koji; Nishiyama, Takashi; Ago, Hiroki; Takata, Yasuyuki.

In: Scientific reports, Vol. 6, 21823, 24.02.2016.

Research output: Contribution to journalArticle

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AU - Zhang, Xing

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