Spontaneous Orientation Polarization of Anisotropic Equivalent Dipoles Harnessed by Entropy Engineering for Ultra‑Thin Electromagnetic Wave AbsorberOA
The synthesis of carbon supporter/nanoscale high-entropy alloys(HEAs)electromagnetic response composites by carbothermal shock method has been identified as an advanced strategy for the collaborative competition engineering of conductive/dielectric genes.Electron migration modes within HEAs as manipulated by the electronegativity,valence electron configurations and molar proportions of constituent elements determine the steady state and efficiency of equivalent dipoles.Herein,enlightened by skin-like effect,a reformative carbothermal shock method using carbonized cellulose paper(CCP)as carbon supporter is used to preserve the oxygencontaining functional groups(O·)of carbonized cellulose fibers(CCF).Nucleation of HEAs and construction of emblematic shell-core CCF/HEAs heterointerfaces are inextricably linked to carbon metabolism induced by O·.Meanwhile,the electron migration mode of switchable electronrich sites promotes the orientation polarization of anisotropic equivalent dipoles.By virtue of the reinforcement strategy,CCP/HEAs composite prepared by 35%molar ratio of Mn element(CCP/HEAs-Mn_(2.15))achieves efficient electromagnetic wave(EMW)absorption of−51.35 dB at an ultra-thin thickness of 1.03 mm.The mechanisms of the resulting dielectric properties of HEAs-based EMW absorbing materials are elucidated by combining theoretical calculations with experimental characterizations,which provide theoretical bases and feasible strategies for the simulation and practical application of electromagnetic functional devices(e.g.,ultra-wideband bandpass filter).
Honghan Wang;Xinyu Xiao;Shangru Zhai;Chuang Xue;Guangping Zheng;Deqing Zhang;Renchao Che;Junye Cheng
Liaoning Key Lab of Lignocellulose Chemistry and BioMaterials,Liaoning Collaborative Innovation Center for Lignocellulosic Biorefinery,School of Light Industry and Chemical Engineering,Dalian Polytechnic University,Dalian 116034,People’s Republic of ChinaLiaoning Key Lab of Lignocellulose Chemistry and BioMaterials,Liaoning Collaborative Innovation Center for Lignocellulosic Biorefinery,School of Light Industry and Chemical Engineering,Dalian Polytechnic University,Dalian 116034,People’s Republic of ChinaLiaoning Key Lab of Lignocellulose Chemistry and BioMaterials,Liaoning Collaborative Innovation Center for Lignocellulosic Biorefinery,School of Light Industry and Chemical Engineering,Dalian Polytechnic University,Dalian 116034,People’s Republic of ChinaSchool of Life Science and Biotechnology,Dalian University of Technology,Dalian 116024,People’s Republic of ChinaDepartment of Mechanical Engineering,Hong Kong Polytechnic University,Hung Hom,Kowloon,Hong Kong 999077,People’s Republic of ChinaSchool of Materials Science and Engineering,Qiqihar University,Qiqihar 161006,People’s Republic of ChinaLaboratory of Advanced Materials,Shanghai Key Lab of Molecular Catalysis and Innovative Materials,Academy for Engineering&Technology,Fudan University,Shanghai 200438,People’s Republic of ChinaDepartment of Materials Science,Shenzhen MSU-BIT University,Shenzhen 517182,People’s Republic of China
High-entropy alloysCarbothermal shockSwitchable electron migration modesEmblematic shell-core heterointerfacesUltra-thin thickness
《Nano-Micro Letters》 2025 (1)
P.424-438,15
Financial support from the National Natural Science Foundation of China(52372289,52102368,52231007,12327804,T2321003,22088101,22178037 and U22A20424)Regional Joint Fund for Basic Research and Applied Basic Research of Guangdong Province(No.2020A1515110905)Guangdong Special Fund for key Areas(20237DZX3042)Shenzhen Stable Support Project,Liaoning Revitalization Talents Program(XLYC2002114)are highly appreciated.
评论