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Lightweight graphite membranes with excellent electromagnetic interference shielding effectiveness and thermal conductivity

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Abstract

Electromagnetic interference (EMI) shielding and thermal management are essential in the design and fabrication of electronic device. Lightweight graphite membranes (GMs) prepared by solid-state foaming technology using polyimide film, are used as raw materials in this work. We obtain four different samples with the thickness of 120 µm, 87 µm, 60 µm and 32 µm by rolling GMs. The EMI shielding effectiveness in 30–3000 MHz and in-plane thermal conductivity of GMs vary from 65.5 to 103.4 dB and 129.3 to 964.6 W m−1 K−1, respectively. The density and electrical conductivity vary from 0.27 to 1.72 g cm−3 and 2.7 × 103–1.5 × 104 S cm−1, respectively. Reflecting and absorbing both are noticeable performances of GMs. The dominant shielding mechanism is the absorption that attributed to the closed-cell pores inside. All the membranes still are thermally stable even the temperature is up to 1000 °C. Therefore, graphite membranes are indeed a novel material combining excellent EMI shielding performance and elevated thermal conductivity.

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Acknowledgements

The authors would like to sincerely acknowledge the financial support of the Youth Innovation Promotion Association, Chinese Academy of Sciences (Grant No. 2017205).

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Authors and Affiliations

  1. CAS Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, 030001, People’s Republic of China

    Baoyi Hao, Zechao Tao, Zhanjun Liu, Dongqing Zhang, Zhao He, Quangui Guo, Lang Liu & Dong Jiang

  2. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, People’s Republic of China

    Baoyi Hao & Zhao He

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  1. Baoyi Hao
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  2. Zechao Tao
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  3. Zhanjun Liu
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  7. Lang Liu
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Correspondence to Dong Jiang.

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Hao, B., Tao, Z., Liu, Z. et al. Lightweight graphite membranes with excellent electromagnetic interference shielding effectiveness and thermal conductivity. J Mater Sci: Mater Electron 30, 6734–6744 (2019). https://doi.org/10.1007/s10854-019-00985-y

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  • DOI: https://doi.org/10.1007/s10854-019-00985-y

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