Dual-surfactant templated hydrothermal synthesis of CoSe_(2) hierarchical microclews for dielectric microwave absorption

作     者：Qi CAO Jie ZHANG Huibin ZHANG Junzhou XU Renchao CHE Qi CAO;Jie ZHANG;Huibin ZHANG;Junzhou XU;Renchao CHE

作者机构：Key Laboratory of Energy Thermal Conversion and Control of Ministry of EducationSchool of Energy and EnvironmentSoutheast UniversityNanjing 210096China Laboratory of Advanced MaterialsShanghai Key Lab of Molecular Catalysis and Innovative MaterialsFudan UniversityShanghai 200438China 

出 版 物：《Journal of Advanced Ceramics》 (先进陶瓷（英文）)

年 卷 期：2022年第11卷第3期

页      面：504-514页

核心收录：

学科分类：081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 

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). 

主　　题：hierarchical structure cobalt diselenide surfactant assembly absorption 

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“ballingwhile 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.