In-situ synthesis of graphite carbon nitride nanotubes/Cobalt@Carbon with castor-fruit-like structure as high-efficiency electromagnetic wave absorbers

Konghu Tian; Yanan Huang; Chao Zhang; Ruiwen Shu; Jinbo Zhu; Yin Liu; Zhihong Chen; Chang Li; Xiaowei Liu

doi:10.1016/j.jcis.2022.04.033

In-situ synthesis of graphite carbon nitride nanotubes/Cobalt@Carbon with castor-fruit-like structure as high-efficiency electromagnetic wave absorbers

J Colloid Interface Sci. 2022 Aug 15:620:454-464. doi: 10.1016/j.jcis.2022.04.033. Epub 2022 Apr 10.

Authors

Konghu Tian¹, Yanan Huang², Chao Zhang², Ruiwen Shu³, Jinbo Zhu⁴, Yin Liu², Zhihong Chen², Chang Li⁵, Xiaowei Liu²

Affiliations

¹ Analytical and Testing Center, Anhui University of Science and Technology, Huainan 232001, China; School of Materials Science and Engineering, Anhui University of Science and Technology, Huainan 232001, China. Electronic address: tkhsuper@163.com.
² School of Materials Science and Engineering, Anhui University of Science and Technology, Huainan 232001, China.
³ School of Chemical Engineering, Anhui University of Science and Technology, Huainan 232001, China. Electronic address: austshuruiwen@126.com.
⁴ School of Materials Science and Engineering, Anhui University of Science and Technology, Huainan 232001, China. Electronic address: pgb2@aust.edu.cn.
⁵ Analytical and Testing Center, Anhui University of Science and Technology, Huainan 232001, China.

PMID: 35447574
DOI: 10.1016/j.jcis.2022.04.033

Abstract

The increasingly electromagnetic wave (EMW) pollution has rendered the study and development of new, high-efficiency EMW absorbers a sought-after topic. In this study, graphite carbon nitride nanotubes/cobalt@carbon (GCNNs/Co@C) composites were fabricated using an in-situ synthesis method, which included facile grinding and carbonization pyrolysis. The synthesized GCNNs/Co@C composites exhibited a unique castor-fruit-like structure, that is, GCNNs formed an entwined three-dimensional (3D) network structure on the surface of cobalt@carbon (Co@C), which improved the EMW absorption properties of composites. The obtained GCNNs/Co@C composites exhibited excellent EMW absorption performance. For the fabricated GCNNs/Co@C composites, the minimum reflection loss (RL_min) value reached -63.90 dB at a thickness of 1.96 mm, and the effective absorption bandwidth (EAB, RL ≤ -10 dB) achieved 4.44 GHz at an ultra-thin thickness of 1.51 mm. The EAB covered the entire X and Ku bands (6.96-18.00 GHz) through thickness adjustment from 1.51 to 2.50 mm. Underlying EMW absorption mechanisms were briefly discussed. This study presents a novel design method to prepare light-weight and highly-efficient EMW absorbing absorbers.

Keywords: Carbonization pyrolysis; Co-MOFs; Electromagnetic wave absorption; Graphite carbon nitride nanotubes; In-situ synthesis.

MeSH terms

Carbon
Cobalt
Electromagnetic Radiation
Fruit
Graphite*
Nanotubes*
Nitriles

Substances

Nitriles
Cobalt
cyanogen
Carbon
Graphite