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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Magnetoresistance of composites based on graphitic discs and cones
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Magnetoresistance of composites based on graphitic discs and cones

机译：基于石墨圆盘和圆锥体的复合材料的磁阻

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摘要

We have studied the magnetotransport of conical and disc-shaped nanocarbon particles in magnetic fields |B| ≤ 9 T at temperatures 2 ≤ T ≤ 300K to characterize electron scattering in a three-dimensional (3D) disordered material of multilayered quasi 2D and 3D carbon nanoparticles. The microstructure of the particles was modified by graphitization at temperatures of 1600 and 2700 ?C. We find clear correlations between the microstructure as seen in transmission electron microscopy and the magnetotransport properties of the particles. The magnetoresistance measurements showed a metallic nature of samples and positive magnetoconductance which is a signature of weak localization in disordered systems. We find that the magnetoconductance at low temperatures resembles quantum transport in single-layer graphene despite the fact that the samples are macroscopic and 3D, consisting of stacked and layered particles, which are randomly oriented in the bulk sample. This graphene-like behaviour is attributed to the very weak interlayer coupling between the graphene layers.
机译：我们研究了锥形和盘状纳米碳粒子在磁场| B |中的磁输运。在2≤T≤300K的温度下≤9 T，以表征多层准2D和3D碳纳米颗粒的三维（3D）无序材料中的电子散射。颗粒的微观结构在1600和2700°C的温度下通过石墨化改性。我们发现在透射电子显微镜中观察到的微观结构与颗粒的磁输运性质之间存在明显的相关性。磁阻测量结果显示出样品的金属性质和正磁导率，这是在无序系统中弱定位的标志。我们发现，低温下的磁导类似于单层石墨烯中的量子输运，尽管事实上样品是宏观的和3D的，由堆积和分层的颗粒组成，这些颗粒在散装样品中随机取向。这种类似于石墨烯的行为归因于石墨烯层之间非常弱的层间耦合。

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