用于高效散热和电磁波吸收的核壳氮化硼@氮掺杂碳异质界面工程,ACS Applied Materials & Interfaces

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用于高效散热和电磁波吸收的核壳氮化硼@氮掺杂碳异质界面工程
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-01-30 , DOI: 10.1021/acsami.2c20766
Zhengxuan Li ₁ , Wang Yang ₁ , Bo Jiang ₁ , Chaonan Wang ₁ , Chengxiao Zhang ₁ , Ni Wu ₁ , Chen Zhang ₁ , Shaoxiong Du ₁ , Siyuan Li ₁ , Hengxuan Bai ₁ , Xiaobai Wang ₂ , Yongfeng Li ₁

Affiliation

将多种功能有效集成到电磁波吸收（EWA）材料中是未来的发展方向，但仍然是一个巨大的挑战。合理的元器件选择和结构设计可以使材料具有优异的EWA性能和散热性能。在此，以水性聚氨酯（WPU）为碳源，通过简易热解工艺制备核壳结构氮化硼@氮掺杂碳（BN@NC），其中NC用作导电损耗壳， BN 作为阻抗匹配核心和主导传热介质。因此，填充石蜡的BN@NC-900在2.2 mm处的最小反射损耗为-42.2 dB，在1.8 mm处的有效吸收带宽为4.48 GHz，导热系数高达0.92 W/m· K在环氧树脂中。最重要的是，制备了柔性 BN@NC/WPU 薄膜，同时实现了高效散热和电磁波（-50.0 dB）的双重功能。此外，实现了从 C 到 Ku 波段的有吸引力的多波段吸收特性 (>99%)，甚至在 S 波段 (2.88 GHz) 实现了超过 −27.0 dB 的强吸收。该研究可能为合理设计多功能EWA材料开辟一条新途径。

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Engineering of the Core–Shell Boron Nitride@Nitrogen-Doped Carbon Heterogeneous Interface for Efficient Heat Dissipation and Electromagnetic Wave Absorption

The effective integration of multiple functions into electromagnetic wave-absorbing (EWA) materials is the future development direction but remains a huge challenge. A rational selection of components and the design of structures can make the material have excellent EWA performance and heat dissipation. Herein, the core–shell structured boron nitride@nitrogen-doped carbon (BN@NC) is prepared by using waterborne polyurethane (WPU) as the carbon source via a facile pyrolysis treatment process, where NC is used as the conductive loss shell, and BN serves as an impedance matching core and dominant heat transfer media. As a result, the BN@NC-900 filled with paraffin wax yields a minimum reflection loss of −42.2 dB at 2.2 mm and an effective absorbing bandwidth of 4.48 GHz at 1.8 mm, and its thermal conductivity reaches up to 0.92 W/m·K in epoxy resin. Most importantly, flexible BN@NC/WPU films are prepared and simultaneously achieve the dual-functional capability of efficiently dissipating heat and electromagnetic waves (−50.0 dB). Besides, an attractive multiband absorption feature (>99%) from C to Ku bands is realized and a strong absorbing over −27.0 dB at the S band (2.88 GHz) is even achieved. This study may pave a new route for the rational design of multifunctional EWA materials.

更新日期：2023-01-30

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