Surface modification of helical carbon nanocoil (CNC) with N-doped and Co-anchored carbon layer for efficient microwave absorption

Xueqing Zuo; Yongpeng Zhao; Hao Zhang; Hui Huang; Cao Zhou; Tianze Cong; Javid Muhammad; Xuan Yang; Yifeng Zhang; Zeng Fan; Lujun Pan

doi:10.1016/j.jcis.2021.10.065

Surface modification of helical carbon nanocoil (CNC) with N-doped and Co-anchored carbon layer for efficient microwave absorption

J Colloid Interface Sci. 2022 Feb 15;608(Pt 2):1894-1906. doi: 10.1016/j.jcis.2021.10.065. Epub 2021 Oct 21.

Authors

Xueqing Zuo¹, Yongpeng Zhao², Hao Zhang¹, Hui Huang¹, Cao Zhou³, Tianze Cong¹, Javid Muhammad¹, Xuan Yang⁴, Yifeng Zhang¹, Zeng Fan¹, Lujun Pan⁵

Affiliations

¹ School of Physics, Dalian University of Technology, Dalian, Liaoning 116024, China.
² School of Physics, Dalian University of Technology, Dalian, Liaoning 116024, China; School of Microelectronics, Dalian University of Technology, Dalian, Liaoning 116024, China.
³ School of Energy and Power Engineering, Dalian University of Technology, Dalian, Liaoning 116024, China.
⁴ School of Materials Science and Engineering, Dalian University of Technology, Dalian, Liaoning 116024, China.
⁵ School of Physics, Dalian University of Technology, Dalian, Liaoning 116024, China. Electronic address: lpan@dlut.edu.cn.

PMID: 34752977
DOI: 10.1016/j.jcis.2021.10.065

Abstract

Surface modification and composition control for nanomaterials are effective strategies for designing high-performance microwave absorbing materials (MWAMs). Herein, we have successfully fabricated Co-anchored and N-doped carbon layers on the surfaces of helical carbon nanocoils (CNCs) by wet chemical and pyrolysis methods, denoted as Co@N-Carbon/CNCs. It is found that pure CNCs show a very good microwave absorption performance under a filling ratio of only 6%, which is attributed to the uniformly dispersed conductive network and the cross polarization induced by the unique chiral and spiral morphology. The coating of N-doped carbon layers on CNCs further enriches polarization losses and the uniform anchoring of Co nanoparticles in these layers generates magnetic losses, which enhance the absorption ability and improve the low frequency performance. As compared with the pure CNCs-filling samples, the optimized Co@N-Carbon/CNCs-2.4 enhances the absorption capacity in the lower frequency range under the same thickness, and realizes the decreased thickness from 3.2 to 2.8 mm in the same X band, as well as the decreased thickness from 2.2 to 1.9 mm in the Ku band. Resultantly, a specific effective absorption wave value of 22 GHz g^-1 mm^-1 has been achieved, which enlightens the synthesis of ultrathin and light high-performance MWAMs.

Keywords: Carbon nanocoils; Electrical conductivity; Microwave absorption; N-doped and Co-anchored; Surface modification.