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Research Article

Thermally conductive polyvinyl alcohol composite films via introducing hetero-structured MXene@silver fillers

Mukun Li1, Yuyao Sun1, Dianying Feng3, Kunpeng Ruan2( ), Xia Liu3, Junwei Gu1,2( )
Queen Mary University of London Engineering School, Northwestern Polytechnical University, Xi’an 710072, China
Shaanxi Key Laboratory of Macromolecular Science and Technology, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi’an 710072, China
Shandong Nonmetallic Materials Institute, Jinan 250031, China
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Graphical Abstract

Ag nanoparticles were in-situ grown on the surface of MXene nanosheets to prepare thermally conductive hetero-structured MXene@Ag fillers. 60 wt.% MXene@Ag-III/PVA composite film shows dual functions of excellent thermal conductivity and electromagnetic interference (EMI) shielding performance, with λ∥, λ⊥, and EMI shielding effectiveness (EMI SE) of 3.72 and 0.41 W/(m·K), and 32 dB, respectively.

Abstract

Ag nanoparticles were in-situ grown on the surface of MXene nanosheets to prepare thermally conductive hetero-structured MXene@Ag fillers. With polyvinyl alcohol (PVA) as the polymer matrix, thermally conductive MXene@Ag/PVA composite films were fabricated by the processes of solution blending, pouring, and evaporative self-assembly. With the same mass fraction, MXene@Ag-III (MXene/Ag, 2:1, w/w) presents more significant improvement in thermal conductivity coefficient (λ) than MXene@Ag, single MXene, Ag, and simply blending MXene/Ag. MXene@Ag-III/PVA composite films show dual functions of excellent thermal conductivity and electromagnetic interference (EMI) shielding. When the mass fraction of MXene@Ag-III is 60 wt.%, the in-plane λ (λ∥), through-plane λ (λ⊥), and EMI shielding effectiveness (EMI SE) are 3.72 and 0.41 W/(m∙K), and 32 dB, which are increased by 3.1, 1.3, and 105.7 times than those of pure PVA film (0.91 and 0.18 W/(m∙K), and 0.3 dB), respectively. The 60 wt.% MXene@Ag-III/PVA composite film also has satisfying mechanical and thermal properties, with Young’s modulus, glass transition temperature, and heat resistance index of 3.8 GPa, 58.5 and 175.3 °C, respectively.

Keywords

hetero-structured MXene@Ag fillerspolyvinyl alcohol composite filmsthermal conductivityelectromagnetic interference shielding

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Nano Research
Volume 16 Issue 5,
May 2023
Pages 7820-7828
DOI: 10.1007/s12274-023-5594-1
Cite this article:
Li M, Sun Y, Feng D, et al. Thermally conductive polyvinyl alcohol composite films via introducing hetero-structured MXene@silver fillers. Nano Research, 2023, 16(5): 7820-7828. https://doi.org/10.1007/s12274-023-5594-1
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Received: 10 February 2023
Revised: 18 February 2023
Accepted: 19 February 2023
Published: 15 March 2023
© Tsinghua University Press 2023
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