Enhanced low-frequency microwave absorbing property of SCFs@TiO2 composite

By Hongjing Wu, Shaohua Qu, Kejun Lin, Yuchang Qing, Liuding Wang, Yuancheng Fan, Quanhong Fu, Fuli Zhang. Powder Technology, 2018

160 citations recorded by the source corpus.

Abstract It has been rarely reported that the microwave absorption materials can exhibit excellent low-frequency EM wave absorbing properties. In this paper, we synthesized steady short carbon fibers (SCFs)@TiO2 composites by using simple one-pot hydrothermal process. The conductive short carbon fibers could be separated by TiO2 nanoparticles from each other and reduced the conductivity of composite materials as a whole, meeting the requirements of impedance matching. With the introduction of SCFs content, SCFs@TiO2 composites showed improved tanδE values at low frequencies, implying the enhanced microwave attenuation ability at low and medium frequency. We unexpectedly found that the SCFs@TiO2 composites exhibited very strong absorbing peaks (i.e., −46.3 dB) at low frequencies with relatively thin matching thickness. Interestingly, when the thickness of the SCFs@TiO2 composite was only 1.0 mm, the absorbing bandwidth with a RL value less than −10 dB was over 14.3–16.7 GHz (i.e., absorbing frequency bandwidth is 2.4 GHz).

Subfields: Aerospace Engineering, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/31ce40b00059e0142ba03b3c939b5b363d61ab8d