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Facile Preparation of Snowflake-Like MnO2@NiCo2O4 Composites for Highly Efficient Electromagnetic Wave Absorption |
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| Authors: | Shuang Wei Prof Xiaoxia Wang Yiwei Zheng Tao Chen Congli Zhou Prof Shougang Chen Prof Jingquan Liu |
| Institution: | 1. College of Materials Science and Engineering, Institute for Graphene Applied Technology Innovation, Qingdao University, Qingdao, 266071 P.R. China
School of Material Science and Engineering, Ocean University of China, Qingdao, 266100 P.R. China These authors contributed equally to this work.;2. College of Materials Science and Engineering, Institute for Graphene Applied Technology Innovation, Qingdao University, Qingdao, 266071 P.R. China;3. School of Material Science and Engineering, Ocean University of China, Qingdao, 266100 P.R. China |
| Abstract: | Snowflake-like MnO2@NiCo2O4 composites were successfully fabricated by employing crossed snowflake-like MnO2 nanorods as cores and one-dimensional (1D) NiCo2O4 nanoneedles as shells. Impressively, the MnO2@NiCo2O4 composites exhibited a highly efficient electromagnetic wave (EMW) absorbing capability, and the minimum reflection loss (RL) value reached ?58.4 dB at 6.8 GHz for a thickness of 4.0 mm. The reasons for the improved EMW absorption capability of snowflake-like MnO2@NiCo2O4 composites were analyzed. The unique core–shell structure, good impedance matching, and high dielectric loss were all found to be important contributors. Moreover, the interfacial polarization mainly stemmed from the heterostructure, a microcurrent generated from the 1D MnO2 nanorods and NiCo2O4 nanoneedles under alternating electromagnetic fields, and the synergistic effect from the different components were all beneficial to improve the EMW absorption performance. These results demonstrated that snowflake-like MnO2@NiCo2O4 composites could be utilized as promising materials for practical EMW absorbing applications. |
| Keywords: | composites dielectric loss electromagnetic waves nanostructures spinel phases |