In this work, electrical conductivity, permittivity behavior and microstructure of carbon materials derived from microcrystalline cellulose precursor at different carbonization temperature were investigated. Electrical percolation was observed with the self-constructed carbon percolative network formed. Plasma-like negative permittivity property was realized, which was well described by Drude model, resulting from the plasma oscillations of free electrons in self-constructed carbon networks. Meanwhile, magnitude and dispersion of the negative permittivity were closely associated with the carbonization temperature. This work provided a convenient way to obtain tunable negative permittivity properties with carbon materials, which have great potential in energy-storage capacitor and electromagnetic shielding applications.

中文翻译：

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不同碳化温度下微晶纤维素衍生碳材料的负介电常数

在这项工作中，研究了在不同碳化温度下衍生自微晶纤维素前体的碳材料的电导率，介电常数行为和微观结构。观察到电渗流与形成的自构碳渗流网络。实现了类似等离子体的负介电常数特性，这是Drude模型很好地描述的，这是由于自构碳网络中自由电子的等离子体振荡所致。同时，负介电常数的大小和分散度与碳化温度密切相关。这项工作提供了一种方便的方法来获得碳材料的可调负介电常数特性，碳材料在储能电容器和电磁屏蔽应用中具有巨大的潜力。