Carbonized wood with ordered channels decorated by NiCo2O4 for lightweight and high-performance microwave absorber

Journal of Advanced Ceramics

Xu Yan¹  Bo Zhong²  Long Xia²  Xiaoxiao Huang³  Yunfei He³  Guangyu Qin³  Yuhao Liu³ 

[1] Beijing Institute of Radio Measurement, 100854, Beijing, China;School of Materials Science and Engineering, Harbin Institute of Technology at Weihai, 264009, Weihai, China;School of Materials Science and Engineering, Harbin Institute of Technology, 150001, Harbin, China;

关键词: microwave absorption (MA);    wood-derived carbon;    ordered-channel architecture;    light weight;    finite element analysis (FEA);   

DOI  :  10.1007/s40145-021-0520-z

来源: Springer

【 摘 要 】

Wood-derived carbon has a 3D porous framework composed of through channels along the growth direction, which is a suitable matrix for preparing electromagnetic wave (EMW) absorbing materials with low cost, light weight, and environmental friendliness. Herein, the carbonized wood decorated by short cone-like NiCo2O4 (NiCo2O4@CW) with highly ordered straight-channel architecture was successfully manufactured through a facile calcination procedure. The horizontal arrangement of the through channels of NiCo2O4@CW (H-NiCo2O4@CW) exhibits a strong reflection loss value of -64.0 dB at 10.72 GHz with a thickness of 3.62 mm and a low filling ratio of 26 wt% (with the density of 0.98 g·cm-3), and the effective absorption bandwidth (EAB) is 8.08 GHz (9.92–18.0 GHz) at the thickness of 3.2 mm. The excellent microwave absorption (MA) property was ascribed to the ordered-channel structure with abundant interfaces and defects from NiCo2O4@CW, which could promote the interfacial polarization and dipole polarization. What is more, this advantageous structure increased the multiple reflections and scattering. Finite element analysis (FEA) simulation is carried out to detect the interaction between the prepared material and EMW when the ordered channels are arranged in different directions. This research provides a low-cost, sustainable, and environmentally friendly strategy for using carbonized wood to fabricate microwave absorbers with strong attenuation capabilities and light weight.

【 授权许可】

CC BY