石墨烯
材料科学
微波食品加热
阻抗匹配
吸收(声学)
兴奋剂
纳米材料
光电子学
电阻率和电导率
电导率
电阻抗
纳米技术
复合材料
化学
电信
工程类
电气工程
物理化学
计算机科学
作者
Yuanliang Zhou,Ning Wang,Muhammad Javid,Dongxing Wang,Yuping Duan,Xuefeng Zhang,Xiaoli Dong,Zhidong Zhang
出处
期刊:Carbon
[Elsevier]
日期:2019-07-01
卷期号:148: 204-213
被引量:115
标识
DOI:10.1016/j.carbon.2019.03.034
摘要
Abundant resources, light weight as well as stable physicochemical properties enable carbon nanomaterials promising candidates toward microwave absorption. However, it is still a great challenge for carbon-based absorbers to achieve broad frequency bandwidth and strong absorption, which fundamentally ascribes to the poor impedance matching resulted by their comparatively high electrical conductivities. Herein, a feasible and high-yield method has been employed to the in-situ synthesis of N-doped graphene nanoflakes which can effectively address interfacial impedance mismatching, and realize the majority of microwaves penetration into the interior of absorber. The incorporation of substitutional N atoms into graphene lattices markedly weaken crystallization degree and introduce masses of defects, directly leading to the decline of electric conductivity, meanwhile benefiting the improvement of static magnetization. Our findings indicate that compared with pure graphene nanoflakes, the counterpart containing 4.6 at.% of nitrogen exhibits an excellent absorption capability, in which more than 99% of microwave energy can be quantitatively attenuated at 5–18 GHz. Experimental results coupled with theory calculations further elucidate that such high performance essentially originates from the proper impedance matching constructed in the N-doped graphene nanoflakes.
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