Preparation of CTCNFs/Co9S8 hybrid nanofibers with enhanced microwave absorption performance
Preparation of CTCNFs/Co9S8 hybrid nanofibers with enhanced microwave absorption performance
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DOI：
10.1088/1361-6528/ab767d
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发表时间：
2020-02
期刊：
影响因子：
3.5
通讯作者：
Jiqi Wang;Fei Wu;Zuoting Yang;Tariq Shah;A. Zhang;Qiuyu Zhang;Baoliang Zhang
中科院分区：
文献类型：
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作者：
Jiqi Wang;Fei Wu;Zuoting Yang;Tariq Shah;A. Zhang;Qiuyu Zhang;Baoliang Zhang
采用三步合成策略制备了具有优异微波吸收能力的负载Co9S8的管状碳纳米纤维（CTCNFs/Co9S8杂化纳米纤维）。首先，使用我们开发的受限自缩合方法合成管状聚合物纳米纤维（TPNF）。然后，TPNF 通过碳化和随后的酸化过程转化为表面羧化管状碳纳米纤维（CTCNF）。最后采用水热法在CTCNFs上可控生长Co9S8纳米粒子，得到一系列不同Co9S8负载量的CTCNFs/Co9S8杂化纳米纤维。所制备的CTCNFs/Co9S8杂化纳米纤维具有丰富的有效界面和缺陷偶极子，这将导致更强的偏振。采用增强介电损耗的策略，CTCNFs/Co9S8混合纳米纤维的微波耗散能力得到显着提高，表现出优异的低频吸收性能，最小反射损耗为-46.81 dB@5.3 GHz。此外，纳米纤维的组成、结构和性能也得到了系统的表征。研究并优化了CTCNFs上Co9S8的负载量以及CTCNFs/Co9S8杂化纳米纤维在基体中的填料含量。还解释了微波衰减机制。
A three-step synthesis strategy has been applied to the preparation of Co9S8-loaded tubular carbon nanofibers (CTCNFs/Co9S8 hybrid nanofibers) with excellent microwave absorbing ability. Firstly, tubular polymer nanofibers (TPNFs) are synthesized using the confined self-condensation method that we developed. Afterwards, TPNFs are converted into surface carboxylated tubular carbon nanofibers (CTCNFs) by carbonization and subsequent acidification processes. Finally, a hydrothermal method is used for the controllable growth of Co9S8 nanoparticles on CTCNFs, and a series of CTCNFs/Co9S8 hybrid nanofibers with different Co9S8 loading are obtained. The prepared CTCNFs/Co9S8 hybrid nanofibers possess abundant effective interface and defect dipoles, which will lead to stronger polarization. Using the strategy of enhancing dielectric loss, the microwave dissipation ability of CTCNFs/Co9S8 hybrid nanofibers has been significantly improved, showing an excellent low-frequency absorbing performance with a minimum reflection loss of −46.81 dB@5.3 GHz. In addition, the composition, structure and properties of nanofibers have been systematically characterized. The Co9S8 loading on CTCNFs and the filler content of CTCNFs/Co9S8 hybrid nanofibers in matrix are studied and optimized. The microwave attenuation mechanism is also explained.