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With the rapid development of the electronics industry, the demand for superior heat dissipation materials is increasing. Although many studies have been conducted on graphene films with high thermal conductivity, most of them are processed at high temperatures (∼3000 °C) using graphene oxide, which is environmentally harmful and consumes large amounts of energy. This paper reports a simple, low-cost, low-energy, high-efficiency method for the preparation of graphite films using only environmentally friendly materials. Composite films with a thermal conductivity of 298.5 Wm-1K-1 were successfully produced by simply dispersing and exfoliating natural graphite and carboxymethylcellulose in a roll mill and depositing by blade coating. Conventional films fabricated using graphene nanoplates (GNP) exhibited a thermal conductivity of 94.6 Wm-1K-1, which is significantly lower than the graphite film produced by roll-milling. Experimental and theoretical investigations reveal the reason for this is that the mixed structure of large graphite and small graphite/GNP reduces the interfacial thermal resistance while forming a denser network of heat conduction paths.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Graphite, Carboxymethylcellulose, Thermal conductivity

Date published: 2025-03-04

Publisher: Elsevier BV

Journal:

• Composites Part C: Open Access (ISSN: 26666820) vol. 17 100580

Funding:

• Japan Society for the Promotion of Science 22H00189
• Japan Society for the Promotion of Science London
• Ministry of Education, Culture, Sports, Science and Technology JPMXS0440500024

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1016/j.jcomc.2025.100580

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Updated at: 2025-03-14 08:30:08 +0900

Published on MDR: 2025-03-14 08:30:10 +0900