Construction of MnO nanoparticles anchored on SiC whiskers for superior electromagnetic wave absorption

Shun Dong; Yang Lyu; Xiutao Li; Jingmao Chen; Xinghong Zhang; Jiecai Han; Ping Hu

doi:10.1016/j.jcis.2019.10.026

Construction of MnO nanoparticles anchored on SiC whiskers for superior electromagnetic wave absorption

J Colloid Interface Sci. 2020 Feb 1:559:186-196. doi: 10.1016/j.jcis.2019.10.026. Epub 2019 Oct 9.

Authors

Shun Dong¹, Yang Lyu², Xiutao Li³, Jingmao Chen³, Xinghong Zhang⁴, Jiecai Han⁵, Ping Hu⁵

Affiliations

¹ National Key Laboratory of Science and Technology for National Defence on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin 150080, China. Electronic address: dongshun@hit.edu.cn.
² School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150001, China.
³ China Academy of Launch Vehicle Technology, Beijing 100076, China.
⁴ National Key Laboratory of Science and Technology for National Defence on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin 150080, China. Electronic address: zhangxh@hit.edu.cn.
⁵ National Key Laboratory of Science and Technology for National Defence on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin 150080, China.

PMID: 31627142
DOI: 10.1016/j.jcis.2019.10.026

Abstract

MnO nanoparticles (MnONP) decorated SiC whiskers (SiCw) with superior electromagnetic (EM) wave absorption performances were successfully synthesized by combining a hydrothermal and thermal annealing process. The microstructural feature and the content of MnONP of these MnONP/SiCw composites could be effectively controlled by the hydrothermal temperature, resulting in the adjustable EM wave absorption capacity. Compared with the poor EM wave absorption property of pristine SiCw (-10.48 dB), the MnONP/SiCw heterostructures achieve substantially enhanced microwave absorption performances, attributing to the suitable impedance matching and improved loss ability arose from the synergetic effect between MnO and SiC, whose minimum reflection loss (RL_min) is improved to -15.84 dB for MnONP/SiCw obtained at 80 °C (S-80), to -15.17 dB for MnONP/SiCw obtained at 100 °C (S-100), and to -55.10 dB for MnONP/SiCw obtained at 120 °C (S-120), respectively. The MnONP/SiCw composite not only exhibits enhanced microwave absorption property, but also presents wider effective absorption bandwidth (EAB), reaching up to 5.4 GHz for S-80, 3.6 GHz for S-100 and 5.2 GHz for S-120 in comparison with pristine SiC (1.5 GHz). This work is expected to provide an effective approach to enhance EM wave absorption property of dielectric materials by incorporation of MnO and the MnONP/SiCw composites could be as a promising candidate for EM wave absorption applications.

Keywords: Electromagnetic wave absorption; MnO nanoparticles; SiC whiskers.