J. Mater. Sci. Technol. ›› 2022, Vol. 119: 37-44.DOI: 10.1016/j.jmst.2021.12.034

• Research Article • Previous Articles     Next Articles

Carbon nanofilm stabilized twisty V2O3 nanorods with enhanced multiple polarization behavior for electromagnetic wave absorption application

Siyao Chenga,c, Cheng Zhangc, Hao Wangc, Jinrui Yeb,*(), Yan Lic, Qiu Zhuanga,c, Wei Dongc, Aming Xiea,*()   

  1. aSchool of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
    bInstitute of Science and Technology, Beihang University, Beijing 100191, China
    cSchool of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
  • Received:2021-11-18 Revised:2021-12-05 Accepted:2021-12-05 Published:2022-08-20 Online:2022-03-04
  • Contact: Jinrui Ye,Aming Xie
  • About author:xieaming@njust.edu.cn (A. Xie).
    * E-mail addresses: yejinrui@buaa.edu.cn (J. Ye),

Abstract:

Vanadium (V) oxides exhibit low electrical conductivity and poor polarization properties, especially in that V2O3 has low stability and is easily oxidized to higher valence V oxides. To solve this problem, we herein provide a two-step strategy for the synthesis of carbon nanofilm stabilized twisty V2O3 nanorods (V2O3@C), including a hydrothermal reaction and a controlled pyrolysis process. Conductivity tests and electron-spin resonance (ESR) spectra indicate that the coating of carbon nanofilm not only enhances the electrical conductivity but also generates abundant defects. The electromagnetic waves absorption (EMA) results suggest that V2O3@C exhibits excellent EMA performance at ultra-low thickness, where the effective absorption bandwidth gets to 7.21 GHz at 1.7 mm and the maximal absorption reaches -56 dB. Enhanced conductivity loss and improved multiple polarization relaxation were used to illustrate the absorbing mechanism of V2O3@C. This work provides new insights into the design of advanced nanocomposites for EMA applications.

Key words: Vanadium oxides, V2O3@C nanorod, Core-shell nanostructure, Electromagnetic wave absorption, Interfacial polarization