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Measuring the thermal conductivity of residue-free suspended graphene bridge using null point scanning thermal microscopy

Authors
Yoon, KichulHwang, GwangseokChung, JaehunKim, Hong GooKwon, OhmyoungKihm, Kenneth DavidLee, Joon Sik
Issue Date
9월-2014
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
CARBON, v.76, pp.77 - 83
Indexed
SCIE
SCOPUS
Journal Title
CARBON
Volume
76
Start Page
77
End Page
83
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/97486
DOI
10.1016/j.carbon.2014.04.051
ISSN
0008-6223
Abstract
Despite the importance of the accurate measurement of the thermal conductivity of graphene, deviations in previous data are still quite large due to the low signal-to-noise ratio in the measurement of graphene temperature, the uncertainties in the measurement of the heat dissipation, and the influence of the polymeric residues. Herein, we improve signal-to-noise ratio by using null point scanning thermal microscopy, which profiles temperature quantitatively with nanoscale spatial resolution (similar to 50 nm), independently of both the heat flux through the air and the variation of the sample surface properties. Also, we control and monitor the heat generation rate accurately by heating the suspended graphene bridge electrically. Furthermore, we prevent the disturbance of the thermal conductivity caused by the polymeric residues by using polydimethylsiloxane stamping method, which leaves much less residue than using polymethylmethacrylate. The thermal conductivity values of graphene, whose length and width are 3.6 and 5.52 mu m, respectively, were measured as 2430 +/- 190, 2150 +/- 170, and 2100 +/- 160 W/mK at the peak temperatures of 335, 361, and 366 K, respectively, with much smaller error range compared to the previously reported values. The measured values exceed the highest value (similar to 2000 W/mK at room temperature) obtained for graphite. (C) 2014 Elsevier Ltd. All rights reserved.
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공과대학 (기계공학부)
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