In-Plane Thermal Conductivity of Polycrystalline Chemical Vapor Deposition Graphene with Controlled Grain Sizes
- Authors
- Lee, Woomin; Kihm, Kenneth David; Kim, Hong Goo; Shin, Seungha; Lee, Changhyuk; Park, Jae Sung; Cheon, Sosan; Kwon, Oh Myoung; Lim, Gyumin; Lee, Woorim
- Issue Date
- 4월-2017
- Publisher
- AMER CHEMICAL SOC
- Keywords
- Graphene; CVD; grain size effect; thermal conductivity
- Citation
- NANO LETTERS, v.17, no.4, pp.2361 - 2366
- Indexed
- SCIE
SCOPUS
- Journal Title
- NANO LETTERS
- Volume
- 17
- Number
- 4
- Start Page
- 2361
- End Page
- 2366
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/83994
- DOI
- 10.1021/acs.nanolett.6b05269
- ISSN
- 1530-6984
- Abstract
- Manipulation of the chemical vapor deposition graphene synthesis conditions, such as operating P, T, heating/cooling time intervals, and precursor gas concentration ratios (CH4/H-2), allowed for synthesis of polycrystalline single layered graphene with controlled grain sizes. The graphene samples were then suspended on 8 mu m diameter patterned holes on a silicon-nitride (Si3N4) substrate, and the in-plane thermal conductivities k(T) for 320 K < T < 510 K were measured to be 2660-1230, 1890-1020, and 680-340 W/m center dot K for average grain sizes of 4.1, 2.2, and 0.5 mu m, respectively, using an opto-thermal Raman technique. Fitting of these data by a simple linear chain model of polycrystalline thermal transport determined k = 5500-1980 W/m center dot K for single-crystal graphene for the same temperature range above; thus, significant reduction of k was achieved when the grain size was decreased from infinite down to 0.5 mu m. Furthermore, detailed elaborations were performed to assess the measurement reliability of k by addressing the hole-edge boundary condition, and the airconvection/radiation losses from the graphene surface.
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