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Thermal conductivity reduction of multilayer graphene with fine grain sizes

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Abstract

The thermal conductivities of monolayer graphene with 4.1 μm grain size and multilayer graphene with 0.3 μm grain sizes are measured by optothermal Raman technique. The number of layers and average grain sizes of graphene are controlled by copper thickness and synthesis conditions in chemical vapor deposition system. In addition, the graphene samples are suspended on a thorough 8-μm hole substrate via PMMA transfer method to avoid substrate effects. As a result, the thermal conductivity graphene is significantly reduced from 3000 to 660 W/m K at 320 K with increasing graphene layers and decreasing grain sizes due to the enhanced phonon scattering. The multilayer graphene with fine grain sizes that has the suppressed thermal conductivity can be useful for application in various field, such as thermoelectric material and thermal rectification.

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Fig. 1
Fig. 2
Fig. 3

Abbreviations

A :

Area

α :

An integral function of r0 and R

d :

Average grain size

n :

The number of grains

Q :

Absorbed heat

R :

Hole-suspended graphene of radius

r 0 :

Laser beam radius

T :

Temperature

T a :

Ambient temperature

T m :

Measured graphene temperature

t :

Thickness of graphene

k :

Thermal conductivity

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Acknowledgements

This research was primarily supported by the Nano-Material Technology Development Program (R2011-003-2009) and Basic Science Research Program (2017R1A2B3005706), and Global Frontier R&D Program on Center for Multiscale Energy System (Grant No. 2012-054172) through the National Research Foundation of Korea funded by the Ministry of Science, ICT and Future Planning, and was also partially supported by the Magnavox Professorship fund from the University of Tennessee (R0-1137-3164) and Institute of Engineering Research at Seoul National University.

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Authors and Affiliations

  1. School of Mechanical and Aerospace Engineering, Seoul National University, Seoul, 151-742, Republic of Korea

    Woomin Lee & Seung Hwan Ko

  2. Mechanical, Aerospace, and Biomedical Engineering, The University of Tennessee, Knoxville, TN, 37996, USA

    Kenneth David Kihm

  3. Institute of Advanced Machinery and Design (SNU-IAMD), Seoul National University, Seoul, 151-742, Republic of Korea

    Seung Hwan Ko

  4. Institute of Engineering Research, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea

    Seung Hwan Ko

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  1. Woomin Lee
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  2. Kenneth David Kihm
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Correspondence to Seung Hwan Ko.

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Lee, W., Kihm, K.D. & Ko, S.H. Thermal conductivity reduction of multilayer graphene with fine grain sizes. JMST Adv. 1, 191–195 (2019). https://doi.org/10.1007/s42791-019-0008-y

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  • DOI: https://doi.org/10.1007/s42791-019-0008-y

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