MOF-derived Co-C composites with 3D star structure for enhanced microwave absorption

Qian Ma; Rong Qiang; Yulong Shao; Xiao Yang; Rui Xue; Bowen Chen; Yi Chen; Shijiang Feng

doi:10.1016/j.jcis.2023.07.167

MOF-derived Co-C composites with 3D star structure for enhanced microwave absorption

J Colloid Interface Sci. 2023 Dec:651:106-116. doi: 10.1016/j.jcis.2023.07.167. Epub 2023 Jul 29.

Authors

Qian Ma¹, Rong Qiang², Yulong Shao³, Xiao Yang¹, Rui Xue¹, Bowen Chen¹, Yi Chen¹, Shijiang Feng¹

Affiliations

¹ College of Textiles, Zhongyuan University of Technology, Zhengzhou, Henan 450007, China.
² College of Textiles, Zhongyuan University of Technology, Zhengzhou, Henan 450007, China; Advanced Textile Equipment Technology Provincial and Ministerial Collaborative Innovation Center, Zhengzhou, Henan 450007, China. Electronic address: Casey2009@126.com.
³ Faculty of Engineering, HUANGHE S&T University, Zhengzhou, Henan 450061, China. Electronic address: syl20081243@126.com.

PMID: 37542886
DOI: 10.1016/j.jcis.2023.07.167

Abstract

The demand of microwave absorption materials (MAMs) with unique morphologies and electromagnetic (EM) balance has become necessary in recent years. Due to the ease of synthesis and tunable structure, metal-organic frameworks (MOFs) are widely used for this special MAMs. In this study, a new three-dimensional hybrid MOF is proposed that is co-doped with six equally branched star morphologies. The Co-C composite has the same six-branched morphology as that of the precursor. When the EM wave is incident, this special structure makes it easier for the EM wave to enter the material vertically due to the expansion of the incident surface, which is effective in adjusting the transmission path of the electron and the reflection and distribution of the EM wave. Because of the special morphology and magneto-dielectric synergy, the Co-C composite shows a minimum reflection loss (R_Lmin) of -48.5 dB at 11.0 GHz at an absorption thickness of 3.0 mm, with a microwave absorption bandwidth (EAB) of 6.1 GHz. This research provides a practical guidance for preparing the MAMs of special star structure.

Keywords: Carbonaceous composites; Cobalt; MOF; Microwave absorption; Star structure.