Microwave-based preparation and characterization of Fe-cored carbon nanocapsules with novel stability and super electromagnetic wave absorption performance

Wang, Yican; Wang, Wenlong; Sun, Jing; Sun, Chenggong; Feng, Yukun; Li, Zhe

Abstract

Microwave-metal discharge was proposed as a facile methodology to prepare unique Fe-cored carbon nanocapsules (Fe@CNCs) with high purity, novel stability and extraordinary electromagnetic wave (EMW) absorption performance. The effect of microwave power, irradiation time and cyclohexane/ferrocene ratio on the production of Fe@CNCs was examined and the properties of the nanocapsules, such as their Fe content, phase, yield, degree of graphitization and associated microstructures were investigated in detail. It was found that the prepared Fe@CNCs, which can easily be separated from the reaction system, displayed exceedingly high electromagnetic wave (EMW) absorption performance over the 2–18 GHz range. At the minimal reflection loss (RL) values over −10 dB, the EMW absorption bandwidth can reach up to 13.8 GHz with an absorber thickness of 1.5–5 mm. In addition, novel thermo-oxidative stability and super anti-corrosion property were also obtained for the Fe@CNCs as no signs of any corrosion or oxidative degradation loss were observed from the accelerated degradation tests in air and acid at temperatures up to 420 °C. The exceedingly high EMW absorption performance coupled with the superior anti-degradation and anti-corrosion properties of the prepared nanocomposite microcapsules highlights the novel capability of microwave-metal discharge in synthesizing advanced metal-cored nanocarbon microcapsules with promising application potentials in diverse fields, such as but not limited to microwave absorption, EM shielding and advanced separations etc.

Citation

Wang, Y., Wang, W., Sun, J., Sun, C., Feng, Y., & Li, Z. (2018). Microwave-based preparation and characterization of Fe-cored carbon nanocapsules with novel stability and super electromagnetic wave absorption performance. Carbon, 135, https://doi.org/10.1016/j.carbon.2018.04.026

• Journal Article Type: Article
• Acceptance Date: Apr 11, 2018
• Online Publication Date: Apr 13, 2018
• Publication Date: Aug 31, 2018
• Deposit Date: May 16, 2018
• Publicly Available Date: Apr 14, 2019
• Journal: Carbon
• Print ISSN: 0008-6223
• Electronic ISSN: 0008-6223
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 135
• DOI: https://doi.org/10.1016/j.carbon.2018.04.026
• Keywords: Fe-cored carbon nanocapsules; Microwave-metal discharge; Preparation; Stability; Electromagnetic wave absorption
• Public URL: https://nottingham-repository.worktribe.com/output/949777
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S0008622318303853