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Fabrication of Lignin-Based Nano Carbon Film-Copper Foil Composite with Enhanced Thermal Conductivity

1
College of Light Industry and Food Engineering, Guangxi University, Nanning 530004, China
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Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control, Nanning 530004, China
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Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China
*
Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(12), 1681; https://doi.org/10.3390/nano9121681
Received: 5 November 2019 / Revised: 20 November 2019 / Accepted: 22 November 2019 / Published: 25 November 2019
Technical lignin from pulping, an aromatic polymer with ~59% carbon content, was employed to develop novel lignin-based nano carbon thin film (LCF)-copper foil composite films for thermal management applications. A highly graphitized, nanoscale LCF (~80–100 nm in thickness) was successfully deposited on both sides of copper foil by spin coating followed by annealing treatment at 1000 °C in an argon atmosphere. The conditions of annealing significantly impacted the morphology and graphitization of LCF and the thermal conductivity of LCF-copper foil composite films. The LCF-modified copper foil exhibited an enhanced thermal conductivity of 478 W m−1 K−1 at 333 K, which was 43% higher than the copper foil counterpart. The enhanced thermal conductivity of the composite films compared with that of the copper foil was characterized by thermal infrared imaging. The thermal properties of the copper foil enhanced by LCF reveals its potential applications in the thermal management of advanced electronic products and highlights the potential high-value utility of lignin, the waste of pulping. View Full-Text
Keywords: lignin; copper foil; graphitization; thermal conductivity; thermal management lignin; copper foil; graphitization; thermal conductivity; thermal management
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MDPI and ACS Style

Luo, B.; Chi, M.; Zhang, Q.; Li, M.; Chen, C.; Wang, X.; Wang, S.; Min, D. Fabrication of Lignin-Based Nano Carbon Film-Copper Foil Composite with Enhanced Thermal Conductivity. Nanomaterials 2019, 9, 1681.

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