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Superior Microwave Absorption Based on ZnO Capped MnO 2 Nanostructures
Author(s) -
He Gaihua,
Duan Yuping,
Pang Huifang,
Hu Jianjun
Publication year - 2020
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.202000407
Subject(s) - materials science , microwave , attenuation , optoelectronics , thermal stability , permittivity , nanostructure , dielectric , composite material , impedance matching , electromagnetic radiation , chemical engineering , nanotechnology , electrical impedance , optics , computer science , telecommunications , physics , electrical engineering , engineering
Dielectric composites based on polybasic components with hierarchical structures have promising potentials for electromagnetic absorber. However, strategy to strengthen coupling of transition metal oxides still demands to be optimized to enhance electromagnetic loss. Herein, inspired by the hierarchical structure of balsam pear, ultrafine ZnO is uniformly distributed and tightly capped in MnO 2 by self‐assembly hydrothermal method. The unique hierarchical structure provides abundant polarization centers with large specific surface area. The compositions promote attenuation performance of electromagnetic waves, enhance relative permittivity and satisfy impedance matching as compared with that of pure ZnO or MnO 2 . The effective bandwidth (RL< −10 dB) reaches 5.93 GHz obtained with thin thickness of 1.8 mm. The effective bandwidth reaches 15 GHz via regulating their thickness. The fabricated MnO 2 /ZnO composites can achieve great adaptability in microwave. MnO 2 /ZnO composites keep stability even heated 700 °C in air. The phase and weight remain unchanged. The proposed interfacial modulation strategy can provide new opportunities for the design of efficient electromagnetic absorber with thermal stability.