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所属单位：材料科学与技术学院

发表刊物：CHEMICAL ENGINEERING JOURNAL

关键字：Cotton Carbon-based composites Impedance matching Electromagnetic wave absorption Lightweight

摘要：Nowadays, carbon materials derived from natural biomaterials have been drawn considerable attention because the biomaterials are vastly available, accessible and renewable. Hereinto, it is fascinating that employing cotton as carbonaceous precursors to fabricate novel sustainable lightweight microwave absorber due to its unique hierarchical macro-/microporous architecture. In current study, we adopt a sustainable route from biomass cotton to construct cotton/zeolitic imidazolate framework (ZIF-67) and subsequent sintering to fabricate carbon-cotton/Co@nanoporous carbon (NPC) products. The as-prepared composites showed definitely superior microwave absorption performance than the pristine carbon-cotton and Co@NPC. It is confirmed that a better impedance matching is the key factor to realize excellent absorption. When the sample filling ratio is as low as 25 wt% in paraffin matrix, the maximum reflection loss can achieve -60.0 dB at 8.48 GHz. Furthermore, via adjusting the thickness to only 1.65 mm, the optimal reflection loss can obtain -51.2 dB at 13.92 GHz with a broad bandwidth of 4.4 GHz. In addition, the annealing temperature for the composites was also investigated, which had significant influence on tuning absorption properties. Prospectively, our present work may provide a new guideline to design carbon composites from earth-abundant recyclable biomass materials as sustainable, lightweight and high-performance absorber.

ISSN号：1385-8947

是否译文：否

发表时间：2018-05-01

合写作者：赵唤琴,成岩,马建娜,张亚男,都有为

通讯作者：姬广斌