Solvent-Free Synthesis of Ultrafine Tungsten Carbide Nanoparticles-Decorated Carbon Nanosheets for Microwave Absorption

作     者：Yunlong Lian Binhua Han Dawei Liu Yahui Wang Honghong Zhao Ping Xu Xijiang Han Yunchen Du Yunlong Lian;Binhua Han;Dawei Liu;Yahui Wang;Honghong Zhao;Ping Xu;Xijiang Han;Yunchen Du

作者机构：MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and StorageSchool of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001People’s Republic of China 

出 版 物：《Nano-Micro Letters》 (纳微快报（英文版）)

年 卷 期：2020年第12卷第11期

页      面：141-153页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：supported by National Natural Science Foundation of China(21676065 and 21776053) 

主　　题：Solvent-free synthesis Tungsten carbide/carbon composite Ultrafine nanoparticle Microwave absorption Dielectric loss 

摘      要：Carbides/carbon composites are emerging as a new kind of binary dielectric systems with good microwave absorption ***,we obtain a series of tungsten carbide/carbon composites through a simple solvent-free strategy,where the solid mixture of dicyandiamide(DCA)and ammonium metatungstate(AM)is employed as the *** cubic WC1-x nanoparticles(3-4 nm)are in situ generated and uniformly dispersed on carbon *** configuration overcomes some disadvantages of conventional carbides/carbon composites and is greatly helpful for electromagnetic *** is found that the weight ratio of DCA to AM can regulate chemical composition of these composites,while less impact on the average size of WC1-x *** the increase in carbon nanosheets,the relative complex permittivity and dielectric loss ability are constantly enhanced through conductive loss and polarization *** different dielectric properties endow these composites with distinguishable attenuation ability and impedance *** DCA/AM weight ratio is 6.0,the optimized composite can produce good microwave absorption performance,whose strongest reflection loss intensity reaches up to-55.6 dB at 17.5 GHz and qualified absorption bandwidth covers 3.6-18.0 GHz by manipulating the thickness from 1.0 to 5.0 *** a performance is superior to many conventional carbides/carbon composites.