Tuning Dielectric Loss of SiO2@CNTs for Electromagnetic Wave Absorption

Fenghui Cao; Jia Xu; Xinci Zhang; Bei Li; Xiao Zhang; Qiuyun Ouyang; Xitian Zhang; Yujin Chen

doi:10.3390/nano11102636

Tuning Dielectric Loss of SiO₂@CNTs for Electromagnetic Wave Absorption

Nanomaterials (Basel). 2021 Oct 7;11(10):2636. doi: 10.3390/nano11102636.

Authors

Fenghui Cao^{1

2}, Jia Xu¹, Xinci Zhang¹, Bei Li¹, Xiao Zhang¹, Qiuyun Ouyang¹, Xitian Zhang³, Yujin Chen^{1

4}

Affiliations

¹ Key Laboratory of In-Fiber Integrated Optics, College of Physics and Optoelectronic Engineering, Harbin Engineering University, Harbin 150001, China.
² School of Mechatronic Engineering, Daqing Normal University, Daqing 163712, China.
³ Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, School of Physics and Electronic Engineering, Harbin Normal University, Harbin 150025, China.
⁴ School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China.

Abstract

We developed a simple method to fabricate SiO₂-sphere-supported N-doped CNTs (NCNTs) for electromagnetic wave (EMW) absorption. EMW absorption was tuned by adsorption of the organic agent on the precursor of the catalysts. The experimental results show that the conductivity loss and polarization loss of the sample are improved. Meanwhile, the impedance matching characteristics can also be adjusted. When the matching thickness was only 1.5 mm, the optimal 3D structure shows excellent EMW absorption performance, which is better than most magnetic carbon matrix composites. Our current approach opens up an effective way to develop low-cost, high-performance EMW absorbers.

Keywords: CNTs; dielectric loss; electromagnetic wave absorption; nitrogen doping.

Abstract

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