Journal
ADVANCED SCIENCE
Volume 8, Issue 7, Pages -Publisher
WILEY
DOI: 10.1002/advs.202003734
Keywords
junction thermal resistance; multiscale structural modulation; phase change composite; thermal interface material; vertically aligned graphene
Categories
Funding
- National Key R&D Program of China [2017YFB0406000]
- Chinese Academy of Sciences [XDC07030100, XDA22020602, KFZD-SW-409, ZD-KYYQ20200001, ZDRW-CN-2019-3]
- CAS Youth Innovation Promotion Association [2020301]
- Science and Technology Major Project of Ningbo [2018B10046, 2016S1002]
- Natural Science Foundation of Ningbo [2017A610010]
- Foundation of State Key Laboratory of Solid lubrication [LSL-1912]
- National Key Laboratory of Science and Technology on Advanced Composites in Special Environments [6142905192806]
- K.C. Wong Education Foundation [GJTD-2019-13]
- China Postdoctoral Science Foundation [2020M681965]
- 3315 Program of Ningbo
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This study demonstrates a multiscale structural modulation strategy to achieve a highly ordered structure of graphene framework and simultaneously reduce junction thermal resistance. The anisotropic framework obtained contributes to polymer composites with a record-high thermal conductivity, giving an ultrahigh thermal conductivity enhancement per 1 vol% graphene.
Graphene is usually embedded into polymer matrices for the development of thermally conductive composites, preferably forming an interconnected and anisotropic framework. Currently, the directional self-assembly of exfoliated graphene sheets is demonstrated to be the most effective way to synthesize anisotropic graphene frameworks. However, achieving a thermal conductivity enhancement (TCE) over 1500% with per 1 vol% graphene content in polymer matrices remains challenging, due to the high junction thermal resistance between the adjacent graphene sheets within the self-assembled graphene framework. Here, a multiscale structural modulation strategy for obtaining highly ordered structure of graphene framework and simultaneously reducing the junction thermal resistance is demonstrated. The resultant anisotropic framework contributes to the polymer composites with a record-high thermal conductivity of 56.8-62.4 W m(-1) K-1 at the graphene loading of approximate to 13.3 vol%, giving an ultrahigh TCE per 1 vol% graphene over 2400%. Furthermore, thermal energy management applications of the composites as phase change materials for solar-thermal energy conversion and as thermal interface materials for electronic device cooling are demonstrated. The finding provides valuable guidance for designing high-performance thermally conductive composites and raises their possibility for practical use in thermal energy storage and thermal management of electronics.
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