Robust composite film with high thermal conductivity and excellent mechanical properties by constructing a long-range ordered sandwich structure

Linhong Li; Maohua Li; Zihui Zhang; Yue Qin; Xiaoxue Shui; Juncheng Xia; Shaoyang Xiong; Bo Wang; Zhenbang Zhang; Xianzhe Wei; Xiangdong Kong; Ping Gong; Tao Cai; Zhongbin Pan; Yong Li; Jinchen Fan; Cheng-Te Lin; Nan Jiang; Jinhong Yu

doi:10.1039/D2TA00975G

Robust composite film with high thermal conductivity and excellent mechanical properties by constructing a long-range ordered sandwich structure†

Linhong Li,‡^ab Maohua Li,‡^a Zihui Zhang,^c Yue Qin,^a Xiaoxue Shui,^a Juncheng Xia,^a Shaoyang Xiong,^a Bo Wang,^a Zhenbang Zhang,^a Xianzhe Wei,^a Xiangdong Kong,^a Ping Gong,^ab Tao Cai,

^ab Zhongbin Pan,^d Yong Li,

*^e Jinchen Fan,

*^f Cheng-Te Lin,

^ab Nan Jiang^ab and Jinhong Yu

*^ab

Author affiliations

* Corresponding authors

^a Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, China

^b Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

^c College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, China

^d School of Materials Science and Chemical Engineering, Ningbo University, China

^e Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China

^f School of Materials and Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, China

Abstract

Simultaneous achievement of high thermal transportation performance and superior mechanical properties in the same thermal management composite film is still a great challenge. Herein, hybrid nano and micro-diamonds (hDs) were introduced for the first time to cellulose nanofibers (CNFs) and boron nitride nanosheets (BNNSs) to construct a long-range ordered “sandwiched structure” by vacuum-assisted layer-by-layer self-assembly. Benefiting from the bridging effect of diamond and the long-range ordered structure with a perfect thermally conductive path, the CNF–BNNS–hD composite film exhibits an in-plane thermal conductivity of 45.76 W m⁻¹ K⁻¹ and through-plane thermal conductivity of 3.17 W m⁻¹ K⁻¹ at a filler content of 48.2 vol%. Additionally, the diamonds are fixed in the “sandwiched structure” as a support layer, and the BNNSs on both sides of the “sandwiched structure” are used for the slip layers, which significantly enhances the mechanical properties of the composite films, making the CNF–BNNS–hD composite film achieve a tensile strength of 88.6 MPa and an elongation at break of 14.7% as well as excellent insulation performance. In addition, the CNF–BNNS–hD composite film could endure 1500 folds without any fracture, demonstrating the excellent flexibility of the film. Our strategy is very effective for the fabrication of a composite film with high thermal conductivity and robust mechanical properties as well as superior electrical insulation performance.

Journal of Materials Chemistry A

Robust composite film with high thermal conductivity and excellent mechanical properties by constructing a long-range ordered sandwich structure†

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Robust composite film with high thermal conductivity and excellent mechanical properties by constructing a long-range ordered sandwich structure

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