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Akbarivakilabadi, Abozar
다차원 탄소재료 연구단
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Highly Ordered and Dense Thermally Conductive Graphitic Films from a Graphene Oxide/Reduced Graphene Oxide Mixture

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Title
Highly Ordered and Dense Thermally Conductive Graphitic Films from a Graphene Oxide/Reduced Graphene Oxide Mixture
Author(s)
Abozar Akbari; Benjamin V. Cunning; Shalik R. Joshi; Chunhui Wang; Dulce C. Camacho-Mojica; Shahana Chatterjee; Vijayakumar Modepalli; Collin Cahoon; Christopher W. Bielawski; Pavel Bakharev; Gun-Ho Kim; Rodney S. Ruoff
Subject
carbonization, ; graphene oxide, ; graphite, ; graphitization, ; MAP3: Understanding, ; reduced graphene oxide, ; thermal interface materials
Publication Date
2020-05
Journal
Matter, v.2, no.5, pp.1198 - 1206
Publisher
Cell Press
Abstract
© 2020 Elsevier Inc.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. Highly oriented graphitic films are used as thermal interface materials in portable electronics. Graphitic films derived from graphene oxide (G-O) could provide advantages, but graphitization of these films results in significant expansion due to heat-induced decomposition of functional groups on G-O. We report methodology that significantly improves the quality of graphitic films derived from G-O. By incorporating a small fraction of “very small”-diameter reduced G-O platelets prior to film casting, we observed less expansion and higher densities after graphitization. Mechanical pressing of these G-O-derived graphitic films can increase density but introduced defects. A subsequent heat treatment improved the crystallinity beyond that prior to mechanical pressing. Combining both approaches yielded a dense, high-quality graphitic film. The addition of reduced G-O could be used in other heat-treated G-O materials where increased density is desirable, e,g., G-O-derived carbon fibers. A new approach to make graphitic thin films from graphene oxide (G-O) is presented. By incorporating small-diameter, reduced G-O platelets with G-O, graphitized films show improved density and crystalline order when compared with pure G-O. Mechanical pressing of the graphitized films increased density but decreased crystallinity. A subsequent high-temperature heat treatment improved atomic order beyond that seen before mechanical pressing. In-plane thermal conductivity is on par with highly oriented pyrolytic graphite and exceeds commercially available graphite-based thermal interface materials
URI
https://pr.ibs.re.kr/handle/8788114/8625
DOI
10.1016/j.matt.2020.02.014
ISSN
2590-2393
Appears in Collections:
Center for Multidimensional Carbon Materials(다차원 탄소재료 연구단) > 1. Journal Papers (저널논문)
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