NiO/Ni Heterojunction on N-Doped Hollow Carbon Sphere with Balanced Dielectric Loss for Efficient Microwave Absorption

被引:163
作者
Li, Bei [1 ]
Ma, Ziqian [1 ]
Zhang, Xiao [1 ]
Xu, Jia [1 ]
Chen, Yujin [1 ,2 ]
Zhang, Xitian [3 ,4 ]
Zhu, Chunling [2 ]
机构
[1] Harbin Engn Univ, Coll Phys & Optoelect Engn, Key Lab Infiber Integrated Opt, Harbin 150001, Peoples R China
[2] Harbin Engn Univ, Coll Mat Sci & Chem Engn, Harbin 150001, Peoples R China
[3] Harbin Normal Univ, Key Lab Photon & Elect Bandgap Mat, Minist Educ, Harbin 150025, Peoples R China
[4] Harbin Normal Univ, Sch Phys & Elect Engn, Harbin 150025, Peoples R China
关键词
dielectric loss behavior; heterojunction; lightweight absorbers; microwave absorption; N-doped hollow carbon spheres; PERFORMANCE; STRATEGY;
D O I
10.1002/smll.202207197
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Hollow carbon spheres are potential candidates for lightweight microwave absorbers. However, the skin effect of pure carbon-based materials frequently induces a terrible impedance mismatching issue. Herein, small-sized NiO/Ni particles with heterojunctions on the N-doped hollow carbon spheres (NHCS@NiO/Ni) are constructed using SiO2 as a sacrificing template. The fabricated NHCS@NiO/Ni displayed excellent microwave absorbability with a minimum reflection loss of -44.04 dB with the matching thickness of 2 mm and a wider efficient absorption bandwidth of 4.38 GHz with the thickness of 1.7 mm, superior to most previously reported hollow absorbers. Experimental results demonstrated that the excellent microwave absorption property of the NHCS@NiO/Ni are attributed to balanced dielectric loss and optimized impedance matching characteristic due to the presence of NiO/Ni heterojunctions. Theoretical calculations suggested that the redistribution of charge at the interfaces and formation of dipoles induced by N dopants and defects are responsible for the enhanced conduction and polarization losses of NHCS@NiO/Ni. The simulations for the surface current and power loss densities reveal that the NHCS@NiO/Ni has- applicable attenuation ability toward microwave under the practical application scenario. This work paves an efficient way for the reasonable design of small-sized particles with well-defined heterojunctions on hollow nanostructures for high-efficiency microwave absorption.
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页数:12
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