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Rationally tailoring interface characteristics of ZnO/amorphous carbon/graphene for heat-conduction microwave absorbers

查看全文 作　　者：Maofan [1]Zhou;Xuefei [1]Xu;Gengping [1]Wan;Pengpeng [1]Mou;Shengjie [1]Teng;Guizhen [1]Wang 高影响力作者 机构地区：[1]State Key Laboratory of Marine Resource Utilization in South China Sea,Hainan University,Haikou 570228,China高影响力机构 出　　处：《Nano Research》索引2022年第15卷第10期,共11页高影响力期刊 基　　金：the National Natural Science Foundation of China(Nos.22068010 and 22168016);the Natural Science Foundation of Hainan Province(No.519QN176);the Finance Science and technology project of Hainan Province(No.ZDYF2020009). 摘　　要：With the increasingly severe electromagnetic interference issue and the huge heat dissipation demand caused by the miniaturized and integrated electronic devices,exploring the heat-conduction microwave absorption(MA)materials is highly desired and remains a great challenge.Herein,we reported the fabrication of ZnO/amorphous carbon(ZnO/AC)hybrid films covered on the surface of graphene(ZnO/AC/Graphene)to simultaneously apply as the MA and thermal management materials.The ZnO/AC coatings synthesized with the auxiliary of an atomic layer deposition(ALD)method are highly uniform and controllable,which can significantly improve the MA performance and thermal conduction properties of graphene.The reflection loss(RL)of−55.4 dB and the effective absorption bandwidth of 5.3 GHz were achieved with thickness of 2.0 mm for ZnO/AC/Graphene at a low loading content(3 wt.%).The minimum RL of−57.9 dB can be obtained in the ZnO/AC/Graphene composites at a low frequency(7.8 GHz).Moreover,the absorption frequency can be regulated by changing the ZnO/AC which can be readily implemented by adjusting the ALD cycles of ZnO.The thermal conductivity of ZnO/AC/Graphene is up to 257.8 mW·m^(−1)·K^(−1),increased by 53.2%compared with natural rubber.The enhancement mechanisms of microwave loss and heat conduction are systematically studied in detail.This work not only develops an excellent candidate,but also provides a novel strategy to design functional materials for heat-conduction MA application. 关 键 词：atomic layer deposition GRAPHENE microwave absorption heat conductivity
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