Processing conditions dependent tunable negative permittivity in reduced graphene oxide-alumina nanocomposites
Processing conditions dependent tunable negative permittivity in reduced graphene oxide-alumina nanocomposites
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还原氧化石墨烯-氧化铝纳米复合材料中加工条件依赖的可调负介电常数
DOI：
10.1016/j.ceramint.2019.05.349
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发表时间：
2019-10
影响因子：
5.2
通讯作者：
Guo Zhanhu
中科院分区：
文献类型：
--
作者：
Huang Xiaoshuai;Yin Rui;Qian Lei;Zhao Wen;Liu Hu;Liu Chuntai;Fan Jincheng;Hou Hua;Zhang Jiaoxia;Guo Zhanhu
本研究采用放电等离子烧结法制备了负介电常数可调的还原氧化石墨烯-氧化铝（RGO-Al2O3）复合材料。通过调节烧结工艺条件实现了负介电常数的调节。首先详细研究了烧结温度和压力对RGO-Al2O3超复合材料介电性能的影响。有趣的是，在 1000°C、50MPa 下制备的含有 8.91 和 15.01vol% GO 的 RGO-Al2O3 复合材料中观察到类 Fano 共振现象。这种现象归因于两种共振的干扰，这与一般的偏振偶极子共振不同。烧结温度通过RGO本身的微电容以及RGO与Al2O3颗粒之间的界面效应来调节介电常数。共振频率还取决于烧结温度。烧结压力有效地控制了介电常数和共振频率，而介电常数和共振频率受GO还原程度和晶粒之间相互接触的影响。随着烧结压力的增加，介电常数值增大，谐振频率提前。总体而言，RGO-Al2O3复合材料的介电常数和共振频率可以通过调整烧结工艺条件轻松调节。
In this study, reduced graphene oxide-alumina (RGO-Al2O3) metacomposites with tunable negative permittivity were obtained from spark plasma sintering method. Regulation of negative permittivity was realized by adjusting the sintering process conditions. The effects of sintering temperature and pressure on the dielectric properties of RGO-Al2O3metacomposites were firstly studied in details. Interestingly, the Fano-like resonance phenomenon was observed in the RGO-Al2O3metacomposites containing 8.91 and 15.01 vol% GO produced from 1000 °C at 50 MPa. This phenomenon was attributed to the interference of two kinds of resonances, which was different from general polarization dipole resonance. The sintering temperature regulated the permittivity via the micro-capacitance of RGO itself and the interfacial effect between RGO and Al2O3grains. The resonance frequency was also dependent on the sintering temperature. The sintering pressure effectively controlled the value of permittivity and the resonance frequency which were influenced by the degree of GO reduction and the mutual contact between grains. With the increase of the sintering pressure, the value of permittivity increased and the resonance frequency advanced. Overall, the permittivity and the resonance frequency of the RGO-Al2O3metacomposites were easily regulated by adjusting the sintering process conditions.
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