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BielawskiChristopher W

Bielawski, Christopher W.
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Highly Ordered and Dense Thermally Conductive Graphitic Films from a Graphene Oxide/Reduced Graphene Oxide Mixture

Author(s)
Akbari, AbozarCunning, Benjamin V.Joshi, Shalik R.Wang, ChunhuiCamacho-Mojica, Dulce C.Chatterjee, ShahanaModepalli, VijayakumarCahoon, CollinBielawski, Christopher W.Bakharev, PavelKim, Gun-HoRuoff, Rodney S.
Issued Date
2020-05
DOI
10.1016/j.matt.2020.02.014
URI
https://scholarworks.unist.ac.kr/handle/201301/31874
Fulltext
https://www.sciencedirect.com/science/article/pii/S259023852030076X?via%3Dihub
Citation
MATTER, v.2, pp.1 - 9
Abstract
We report a new approach to making highly dense, oriented, and crystalline graphite films from heat-treated and pressed graphene oxide (G-O). By introducing small-diameter reduced graphene oxide (rG-O) flakes into the graphene oxide starting material, we found that after heat treatment at 3,000°C, the sample density and atomic order substantially improved over a film composed, at the outset, only of pure G-O flakes. A subsequent mechanical press increased the density but reduced the atomic order. A second 3,000°C heat treatment restored the graphitic structure with graphitization metrics exceeding even those of the first heat treatment. The optimized graphitic film with an original concentration of 15 wt % reduced G-O in G-O gave well-oriented graphitic films with a density of 2.1 g cm−3, cross-plane thermal conductivity of 5.65 W m−1 K−1, and in-plane thermal conductivity of 2,025 ± 25 W m−1 K−1.
Publisher
ELSEVIER
ISSN
2590-2393
Keyword (Author)
graphene oxidegraphitecarbonizationgraphitizationreduced graphene oxidethermal interface materials

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