Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7849296 | Carbon | 2016 | 33 Pages |
Abstract
Hollow carbon nanospheres (HCNs) with tunable sizes have been successfully prepared by the calcination of hollow copolymer nanospheres. Our findings indicate that compared to the counterpart solid carbon particle, HCNs all achieve substantially enhanced microwave absorption, suggesting that hollow structure plays an important role during microwave absorption. Moreover, further investigation on the effect of different HCNs sizes upon microwave absorption has been conducted. It is found that HCNs with an outer diameter of â¼70Â nm and inner diameter of â¼30Â nm exhibit the champion EM absorption performance, a minimum reflection loss (RL) of â50.8Â dBÂ at 13.5Â GHz with a thickness of 1.9Â mm, along with the corresponding bandwidth of RL less than â10Â dB (90% absorption) covering 4.8Â GHz. Notably, such excellent microwave absorption performance, probably as a result of well-matched impedance together with multiple reflection induced by the distinctive hollow structure, demonstrates HCNs to be one of the most competitive carbon-based absorbers to date. More importantly, this study provides an effective strategy to tune the microwave performance via tailoring the sizes of HCNs.
Related Topics
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Authors
Chen Zhou, Sai Geng, Xiuwen Xu, Tihong Wang, Liqiang Zhang, Xiaojuan Tian, Fan Yang, Haitao Yang, Yongfeng Li,