Graphene Shield by SiBCN Ceramic: A Promising High Temperature Electromagnetic Wave-Absorbing Material with Oxidation Resistance.
Authors of this article are:
Luo C, Jiao T, Gu J, Tang Y, Kong J.
A summary of the article is shown below:
As cutting-edge emerging electromagnetic (EM)-wave-absorbing materials, the Achilles’ Heel of graphenes is vulnerable oxidation under high temperature and oxygen atmosphere, particularly at temperatures more than 600 °C. Herein, a graphene@Fe3O4/siliconboron carbonitride (SiBCN) nanocomplex with a special hierarchical A/B/C structure, in which SiBCN serves as a “shield” to protect graphene@Fe3O4 from undergoing high temperature oxidation, is designed and tuned by polymer-derived ceramics (PDC) route. The nanocomplexes are stable even at 1100-1400°C in either argon or air atmosphere. Their minimum reflection coefficient (RCmin) and effective absorption bandwidth (EAB) are 43.78 dB and 3.4 GHz at ambient temperature, respectively. After oxidation at 600°C, they exhibit much better EM wave absorption, where the RCmin decreases to 66.21 dB and EAB increases to 3.69 GHz in X-band. At high temperature of 600 °C, they also possess excellent and promising EW wave-absorption, which EAB is 3.93 GHz covering 93.6% range of X-band. In comparison to previous works on graphenes, either the EAB or RCmin of these nanocomplexes set new record for graphene-based EM wave-absorbing materials at high temperature and oxidation. This novel nanomaterial technology may shed light on the downstream applications of graphenes in EM-wave-absorbing devices and smart structures worked in harsh environments.
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