Simple strategy to tune the charge transport properties of conjugated polymer/carbon nanotube composites using an electric field assisted deposition technique
Simple strategy to tune the charge transport properties of conjugated polymer/carbon nanotube composites using an electric field assisted deposition technique
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使用电场辅助沉积技术调节共轭聚合物/碳纳米管复合材料的电荷传输特性的简单策略
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发表时间：
2014
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通讯作者：
B. Ratier
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作者：
J. Marzouk;B. Lucas;T. Trigaud;A. Pothier;J. Bouclé;B. Ratier
在有机半导体聚合物中掺入碳纳米管的工作已被许多研究小组报道，聚合物/碳纳米管复合材料的电学性质也得到了广泛的研究。在这项工作中，我们提出了一种简单的方法来调节基于聚(3-己基噻吩基)(P3HT)的平面有机聚合物薄膜的电荷传输特性。聚合物/碳纳米管复合材料是利用电场辅助取向技术从溶液中同时加工和取向的。我们首先单独研究了碳纳米管在取向过程中的行为，并强调了驱动其在衬底上最终取向的主要实验参数。通过定量分析碳纳米管在衬底上的角度分布，我们发现用于分散和沉积碳纳米管的溶剂的介电常数是保证碳纳米管有效取向的关键，并且发生了类似介电泳法的取向过程。通过研究取向和非取向器件在环境条件下的电学性质，将这种方法转移到平面P3HT/CNT复合材料中。电流-电压特性表明，随着碳纳米管的加入和取向，复合材料的电导率急剧增加。在P3HT中添加碳纳米管(1wt%)后，场效应晶体管的电荷迁移率提高了一个数量级，并且使用优化的取向参数又获得了十年，而不需要任何额外的退火热处理。这些结果显示了我们的方法在印刷电子学和有机光电子学领域的强大潜力。C�2013年化学工业学会
Work concerning the incorporation of carbon nanotubes (CNTs) in organic semiconducting polymers have now been reported by many research groups, and the electrical properties of polymer/CNT nanocomposites have been extensively studied. In this work, we present a simple procedure to tune the charge transport properties of planar organic polymer films based on poly(3-hexylthiophene) (P3HT). The polymer/CNT composites are simultaneously processed and oriented from solution using an electric field assisted orientation technique. We first study the behavior of CNTs alone during the alignment procedure and emphasize the main experimental parameters that drive their final orientation on the substrate. By quantitatively analyzing the CNT angular distribution on the substrate, we show that the dielectric constant of the solvent used to disperse and deposit the CNTs is crucial to ensure an efficient orientation, and that a dielectrophoresis-like orientation procedure occurs. The transposition of this approach to planar P3HT/CNT composites is made by investigating the electric properties in ambient conditions of aligned and non-aligned devices. Current‐voltage characteristics show a drastic increase of the composite conductivity upon addition and alignment of CNTs. Field-effect transistor charge mobilities are improved by an order of magnitude upon addition of CNT (1 wt%) in P3HT, and another decade is gained using the optimized alignment parameters, without any additional annealing. These results demonstrate the strong potentialities of our approach in the field of printed electronics and organic optoelectronics. c � 2013 Society of Chemical Industry