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Facile Design of Three-Dimensional Nitrogen-Doped Reduced Graphene Oxide/Multi-Walled Carbon Nanotube Composite Foams as Lightweight and Highly Efficient Microwave Absorbers.
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-01-14 , DOI: 10.1021/acsami.9b16134
Ruiwen Shu 1, 2 , Zongli Wan 1 , Jiabin Zhang 1 , Yue Wu 1 , Yin Liu 3 , Jianjun Shi 1 , Mingdong Zheng 1
Affiliation  

Graphene foams with three-dimensional (3D) network structure, high porosity, and ultralow density have been regarded as lightweight microwave absorption materials. Herein, nitrogen-doped reduced graphene oxide/multi-walled carbon nanotube composite foams were prepared through a two-step strategy of hydrothermal self-assembly and subsequent high-temperature calcination. Morphology analysis indicated that the 3D networks were composed of overlapped flaky reduced graphene oxide. In addition, the influences of nitrogen doping, calcination temperature, and filler ratios on microwave absorption of composite foams were explored. Results manifested that the microwave absorption of composite foams was remarkably improved with the calcination temperature increased. Dramatically, it was noteworthy that the composite foam obtained under 600 °C calcination (bulk density of ∼10.8 mg/cm3) with an 8 wt % mass filler ratio presented the strongest microwave absorption of -69.6 dB at 12.5 GHz and broadest absorption bandwidth achieved 4.3 GHz (13.2-17.5 GHz) at an extremely low matching thickness equal to 1.5 mm. Moreover, the microwave absorption performance could be conveniently adjusted through modifying the thicknesses, filler ratios, and calcination temperature. The excellent microwave absorption performance of as-prepared composite foams was greatly derived from a well-constructed 3D network structure, significant nitrogen doping, enhanced polarization relaxation, and improved conduction loss. This work proposed a new strategy for fabricating graphene-based composites with a 3D network structure as high-efficiency microwave absorbers.

中文翻译:

轻便高效的三维氮掺杂还原氧化石墨烯/多壁碳纳米管复合泡沫的简便设计。

具有三维(3D)网络结构,高孔隙率和超低密度的石墨烯泡沫被视为轻质的微波吸收材料。在此,通过水热自组装和随后的高温煅烧的两步策略制备了氮掺杂的还原氧化石墨烯/多壁碳纳米管复合泡沫。形态分析表明,3D网络由重叠的片状还原氧化石墨烯组成。此外,探讨了氮掺杂,煅烧温度和填料比对复合泡沫塑料微波吸收的影响。结果表明,随着焙烧温度的升高,复合泡沫材料的微波吸收率显着提高。戏剧性地 值得注意的是,在质量分数为8 wt%的600°C煅烧(体积密度约为10.8 mg / cm3)下获得的复合泡沫材料在12.5 GHz时的最强微波吸收为-69.6 dB,最宽的吸收带宽达到4.3 GHz (13.2-17.5 GHz),匹配厚度极低,等于1.5 mm。而且,可以通过改变厚度,填料比率和煅烧温度来方便地调节微波吸收性能。制备好的复合泡沫材料具有出色的微波吸收性能,这得益于结构良好的3D网络结构,明显的氮掺杂,增强的极化弛豫和改善的传导损耗。
更新日期:2020-01-14
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