Details

Autor(en) / Beteiligte

• Wang, Yan
• Han, Bingqian
• Chen, Nan
• Deng, Dongyang
• Guan, Hongtao
• Wang, Yude

Titel

Enhanced microwave absorption properties of MnO2 hollow microspheres consisted of MnO2 nanoribbons synthesized by a facile hydrothermal method

Ist Teil von

• Journal of alloys and compounds, 2016-08, Vol.676, p.224-230

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2016

Quelle

ScienceDirect

Beschreibungen/Notizen

• MnO2 hollow microspheres consisted of nanoribbons were successfully fabricated via a facile hydrothermal method with SiO2 sphere templates. The crystal structure, morphology and microwave absorption properties in X and Ku band of the as-synthesized samples were characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM) and a vector network analyzer. The results show that the three-dimensional (3D) hollow microspheres are assembled by ultra thin and narrow one-dimensional (1D) nanoribbons. A rational process for the formation of hollow microspheres is proposed. The 3D MnO2 hollow microspheres possess improved dielectric and magnetic properties than the 1D nanoribbons prepared by the same procedures with the absence of SiO2 hard templates, which are closely related to their special nanostructures. The MnO2 microspheres also show much better microwave absorption properties in X (8–12 GHz) and Ku (12–18 GHz) microwave band compared with 1D MnO2 nanoribbons. The minimum reflection loss of −40 dB for hollow microsphere can be observed at 14.2 GHz and reflection loss below −10 dB is 3.5 GHz with a thickness of only 4 mm. The possible mechanism for the enhanced microwave absorption properties is also discussed. MnO2 hollow microspheres composed of nanoribbons show the excellent microwave absorption properties in X and Ku band. [Display omitted] •MnO2 hollow microspheres consisted of MnO2 nanoribbons were successfully prepared.•MnO2 hollow microspheres possess good microwave absorption performances.•The excellent microwave absorption properties are in X and Ku microwave band.•Electromagnetic impedance matching is great contribution to absorption properties.