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首页> 外文期刊>Bulletin of Materials Science >Influence of the concentration of carbon nanotubes on electrical conductivity of magnetically aligned MWCNT-polypyrrole composites
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Influence of the concentration of carbon nanotubes on electrical conductivity of magnetically aligned MWCNT-polypyrrole composites

机译：碳纳米管浓度对磁性取向MWCNT-聚吡咯复合材料电导率的影响

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摘要

The goal of this work is to study the effect of high magnetic pulses on electrical property of carbon nanotube-polypyrrole (CNT-PPy) composites with different CNT concentrations. CNT-PPy composites are produced in fractions of 1, 5 and 9 wt%. During the polymerization process, the CNTs are homogeneously dispersed throughout the polymer matrix in an ultrasonic bath. Nanocomposite rods are prepared. After exposure to 30 magnetic pulses, the resistivity of the rods is measured. The surface conductivity of thin tablets of composites is studied by 4-probe technique. The magnitude of the pulsed magnetic field is 10 Tesla with time duration of 1.5 ms. The results show that after applying 30 magnetic pulses, the electrical resistivity of the composites decreases depending on the concentration of CNTs in the composites. The orientation of CNTs is probed by atomic force microscopy (AFM) technique. AFM images approved alignment of CNT-polymer fibres in the magnetic field. We found that the enhancement in the electrical properties of CNT-PPy composites is due to rearrangement and alignment of CNTs in a high magnetic field. The stability of nano-composites is studied by Fourier transform infrared spectroscopy.
机译：这项工作的目的是研究高磁脉冲对具有不同CNT浓度的碳纳米管-聚吡咯（CNT-PPy）复合材料的电性能的影响。 CNT-PPy复合材料的生产比例为1、5和9 wt％。在聚合过程中，CNT在超声浴中均匀分散在整个聚合物基质中。制备纳米复合棒。暴露于30个磁脉冲后，测量棒的电阻率。采用四探针技术研究了复合材料薄片的表面电导率。脉冲磁场的大小为10特斯拉，持续时间为1.5毫秒。结果表明，施加30个磁脉冲后，复合材料的电阻率随复合材料中CNT的浓度而降低。碳纳米管的取向通过原子力显微镜（AFM）技术进行探测。 AFM图像批准了CNT聚合物纤维在磁场中的排列。我们发现，CNT-PPy复合材料的电性能增强是由于在高磁场中CNT的重排和排列。通过傅立叶变换红外光谱研究了纳米复合材料的稳定性。

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