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Polyaniline nanoparticle-carbon nanotube hybrid network vapour sensors with switchable chemo-electrical polarity

机译：具有可切换化学电极性的聚苯胺纳米颗粒-碳纳米管混合网络蒸汽传感器

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摘要

Chemo-resistive sensors were prepared from monodisperse poly(aniline) nanoparticles (PaniNP) synthesized via oxidative dispersion polymerization. Poly(styrene sulfonic acid) (PSSA) was used as the stabilizer and dopant agent. PaniNP transducers were assembled by spraying layer by layer a solution containing different concentrations of PaniNP and multi-wall carbon nanotubes (MWNT) onto interdigitated electrodes. This process led to stable sensors with reproducible responses upon chemical cycling. Chemo-electrical properties of these sensors have been investigated in sequential flows of pure nitrogen and nitrogen saturated with a set of volatile organic compounds (VOC). Interestingly the sensing mode of PaniNP transducers (the NVC or PVC effect) can be switched simply by increasing PaniNP content or by the addition of only0.5% of MWNT to reach a resistance lower than 150Ω. Due to their original conducting architecture well imaged by atomic force microscopy (AFM), i.e. a double percolated conductive network, PaniNP-MWNT hybrids present both higher sensitivity and selectivity than other formulations, demonstrating a positive synergy. Mechanisms are proposed to describe the original chemo-electrical behaviours of PaniNP-based sensors and explain the origin of their selectivity and sensing principle. These features make them attractive to be integrated in e-noses.
机译：由通过氧化分散聚合合成的单分散聚（苯胺）纳米颗粒（PaniNP）制备耐化学传感器。聚（苯乙烯磺酸）（PSSA）用作稳定剂和掺杂剂。通过将包含不同浓度的PaniNP和多壁碳纳米管（MWNT）的溶液逐层喷涂到叉指电极上，组装PaniNP换能器。这个过程导致稳定的传感器在化学循环后具有可重复的响应。这些传感器的化学电学性质已经在纯氮气和被一组挥发性有机化合物（VOC）饱和的氮气的连续流动中进行了研究。有趣的是，可以通过增加PaniNP含量或仅添加0.5％的MWNT来达到低于150Ω的电阻，从而轻松切换PaniNP换能器的感测模式（NVC或PVC效应）。由于PaniNP-MWNT杂化物的原始导电体系结构已通过原子力显微镜（AFM）很好地成像，即双重渗透的导电网络，因此比其他配方具有更高的灵敏度和选择性，显示出积极的协同作用。提出了机制来描述基于PaniNP的传感器的原始化学电行为，并解释其选择性和传感原理的起源。这些功能使它们很有吸引力，可以集成到电子鼻中。

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