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首页> 外文期刊>Journal of Materials Science >Dispersion assessment and studies on AC percolative conductivity in polymer-derived Si-C-N/CNT ceramic nanocomposites
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Dispersion assessment and studies on AC percolative conductivity in polymer-derived Si-C-N/CNT ceramic nanocomposites

机译：聚合物衍生的Si-C-N / CNT陶瓷纳米复合材料的交流渗透电导率色散评估和研究

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Nanocomposites comprise polysilazane-derived SiCN ceramic charged with carbon nanotubes (CNTs) have been prepared by dispersion of multi-walled CNTs with a diameter of 80 nm in a cross-linked polysilazane (HTT 1800, Clariant) using a simple roll-mixer method. Subsequently, the composites were warm pressed and pyrolyzed in argon atmosphere. Scanning electron microscopy (SEM) and 3D Raman imaging techniques were used as major tools to assess the dispersion of CNTs throughout the ceramic matrix. Furthermore, studies on the effect of the volume fraction of CNTs in the nanocomposites on their electrical properties have been performed. The specific bulk conductivities of the materials were analyzed by AC impedance spectroscopy, revealing percolation thresholds (rho(c)) at CNT loadings lower than 1 vol%. Maximum conductivity amounted to 7.6 x 10(-2) S/cm was observed at 5 vol% CNT. The conductivity exponent in the SiCN/CNT composites was found equal to 1.71, indicating transport in three dimensions.
机译：纳米复合材料包含带有碳纳米管（CNT）的聚硅氮烷衍生的SiCN陶瓷，这是通过使用简单的辊式混合器方法将直径为80 nm的多壁CNT分散在交联的聚硅氮烷（HTT 1800，Clariant）中制备的。随后，将复合物热压并在氩气气氛中热解。扫描电子显微镜（SEM）和3D拉曼成像技术被用作评估CNT在整个陶瓷基体中的分散性的主要工具。此外，已经进行了关于纳米复合物中的CNT的体积分数对其电性能的影响的研究。通过交流阻抗谱分析了材料的比容电导率，揭示了在CNT含量低于1 vol％时的渗滤阈值（rho（c））。在5％（体积）的CNT处观察到的最大电导率为7.6 x 10（-2）S / cm。发现SiCN / CNT复合材料中的电导率指数等于1.71，表明在三维中的传输。

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