材料科学
石墨烯
陶瓷
反射损耗
微波食品加热
电介质
化学气相沉积
氧化物
介电损耗
石墨
光电子学
复合材料
吸收(声学)
纳米技术
复合数
电信
冶金
计算机科学
作者
Fang Ye,Qiang Song,Zhenchuang Zhang,Wei Li,Shouyang Zhang,Xiaowei Yin,Yuan Zhou,Huiwen Tao,Yongsheng Liu,Laifei Cheng,Litong Zhang,Hejun Li
标识
DOI:10.1002/adfm.201707205
摘要
Abstract High‐performance graphene microwave absorption materials are highly desirable in daily life and some extreme situations. A simple technique for the direct growth of graphene as absorption fillers in wave‐transmitting matrices is of paramount importance to bring it to real‐world application. Herein, a simple chemical vapor deposition (CVD) route for the direct growth of edge‐rich graphene (ERG) with tailored structures and tunable dielectric properties in porous Si 3 N 4 ceramics using only methyl alcohol (CH 3 OH) as precursor is reported. The large O/C atomic ratio of CH 3 OH helps to build a mild oxidizing atmosphere and leads to a unique structure featuring open graphite nanosteps and freestanding nanoplanes, endowing the ERG/Si 3 N 4 hybrid with an appropriate balance between good impedance matching and strong loss capacity. Accordingly, the prepared materials exhibit superior electromagnetic wave absorption, far surpassing that of traditional CVD graphene and reduced graphene oxide‐based materials, achieving an effective absorption bandwidth of 4.2 GHz covering the entire X band, with a thickness of 3.75 mm and a negligibly low loading content of absorbents. The results provide new insights for developing novel microwave absorption materials with strong reflection loss and wide absorption frequency range.
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