期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 24, 页码 27350-27360出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c05692
关键词
electromagnetic shielding; MXene film; fireproof; anisotropic heat dissipation/insulation; Joule heating
资金
- China Postdoctoral Science Foundation [2018M642780]
- Opening Project of State Key Laboratory of Polymer Materials Engineering (Sichuan University) [sklpme2019-4-31]
- Startup Research Fund of Zhengzhou University [32211146]
The burgeoning development of wearable electronic devices has resulted in urgent demands for electromagnetic interference (EMI) shielding films that feature excellent fireproof and heat dissipation capability. Herein, multifunctional fireproof EMI shielding films with excellent anisotropic thermal conductivity are constructed based on MXene and montmorillonite (MMT) via a simple vacuum-assisted filtration technique. The presence of MMT can protect the MXene from oxidation and endow the composite films with exceptional fire-resistant ability. The impressive thermal conductivity performance, high in-plane thermal conductivity (28.8 W m(-1) K-1) and low cross-plane thermal conductivity (0.27 W m(-1) K-1), ingeniously enables highly efficient in-plane heat dissipation and cross-plane heat insulation in the MXene-based films simultaneously. The high electrical conductivity (4420 S m(-1)) of the composite film enables an excellent EMI shielding effectiveness of over 65 dB in the entire X-band and a high specific shielding effectiveness of over 10 000 dB cm(2) g(-1) at a thickness of only 25 mu m. Importantly, the EMI shielding effectiveness is maintained at above 60 dB even after burning for 30 s. Besides, the composite films show outstanding Joule heating performance with a fast thermal response (<10 s) and a low driving voltage (<5 V). These multifunctional films are highly promising for applications concerning fire protection, de-icing, heat dissipation/insulation, and EMI shielding devices.
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