摘要
Cobalt diselenide(CoSe_(2))hierarchical clew-like structure is synthesized via a dual-surfactant templated hydrothermal process,and for the first time,its microwave absorption capability has been established.Specifically,the as-synthesized hierarchical interconnected structure is assembled by numerous dense nanobelts.Meticulous tuning of the synthetic conditions which could influence the hierarchical architecture indicates that,in this system,cetyltrimethylammonium bromide(CTAB)plays a dominate role of“balling”while protonated diethylenetriamine(DETA)plays the role of“stringing”.As a novel absorbent,the microwave absorption performance of CoSe_(2)microstructure is evaluated in 2–18 GHz band.Particularly,3D hierarchical CoSe_(2)microclews exhibit superior minimum reflection loss of−26.93 dB at 7.28 GHz and effective absorption bandwidth of 3.72 GHz,which are∼120%and∼104%higher than those of simple CoSe_(2)nanosheets,respectively.Such drastic enhancement could be attributed to the large specific surface area,and more dissipation channels and scattering sites enabled by the unique clew-like microstructure.The versatile dual-surfactant templated assembly of hierarchical CoSe_(2)microstructure,along with its appreciable dielectric microwave absorption performance,provides new inspirations in developing novel microwave absorbents for mitigation of electromagnetic pollution.
基金
This work was supported by the National Natural Science Foundation of China(Nos.52101213,51725101,11727807,51672050,and 61790581)
Qi CAO would like to thank the support from the Department of Science and Technology of Jiangsu Province(No.BK20210261)
“Zhi-Shan”Scholars Programme of Southeast University of China.Renchao CHE acknowledges the support by the Ministry of Science and Technology of China(No.2018YFA0209102).
