Controllable coating NiAl-layered double hydroxides on carbon nanofibers as anticorrosive microwave absorbers  

作　　者：Ying Zhang Liang Li Changlong Du Gengping Wan Qiyi Wei Xueqing Zhou Yanran Su Yang Xu Guizhen Wang 

机构地区：[1]State Key Laboratory of Marine Resource Utilization in South China Sea,School of Chemical Engineering and Technology,Hainan University,Haikou 570228,China [2]Collaborative Innovation Center of Ecological Civilization,Hainan University,Haikou 570228,China

出　　处：《Journal of Materials Science & Technology》2023年第20期109-118,共10页材料科学技术（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.22068010,22278101,and 22168016);the Finance Science and Technology Project of Hainan Province(Grant Nos.ZDYF2020009);the Natural Science Foundation of Hainan Province(Grant Nos.2019RC142 and 519QN176).

摘　　要：For harsh real-world service settings,it is essential to build corrosion-resistant,diverse,and effective microwave absorbers.Herein,we successfully prepared a 3D NiAl-layered double hydroxide/carbon nanofibers(NiAl-LDH/CNFs)composite material as an anticorrosive microwave absorber assisted by an atomic layer deposition(ALD)method.The size,coating thickness,and content of NiAl-LDH can be readily adjusted by changing the ALD cycling numbers.The optimized NiAl-LDH/CNFs demonstrates prominent microwave absorbing properties including the strongest reflection loss of–55.65 dB and the widest effective absorption bandwidth of 4.80 GHz with only 15 wt%loading.The reasons for performance improvement are the cooperative effect of interfacial polarization loss,conduction loss,and three-dimensional porous structure.Moreover,due to the synergistic effects between the excellent impermeability of CNFs and the trapping ability of NiAl-LDH for chloride ions,NiAl-LDH/CNFs exhibits strong corrosion resistances under acidic,neutral,and alkaline conditions.NiAl-LDH/CNFs should be a potential candidate to simultaneously use for microwave absorption and corrosion resistance,and this work provides a certain guiding significance for designing microwave absorbers that satisfy the corrosion resistance.

关 键 词：Microwave absorption ANTICORROSION Atomic layer deposition(ALD) Double layered hydroxides(LDHs) Carbon nanofibers(CNFs) 

分 类 号：TB3[一般工业技术—材料科学与工程]