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Actuation of polypyrrole nanowires

机译：聚吡咯纳米线的致动

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摘要

Nanoscale actuators are essential components of the NEMS ( nanoelectromechanical systems) and nanorobots of the future, and are expected to become a major area of development within nanotechnology. This paper demonstrates for the first time that individual polypyrrole ( PPy) nanowires with diameters under 100 nm exhibit actuation behavior, and therefore can potentially be used for constructing nanoscale actuators. PPy is an electroactive polymer which can change volume on the basis of its oxidation state. PPy-based macroscale and microscale actuators have been demonstrated, but their nanoscale counterparts have not been realized until now. The research reported here answers positively the fundamental question of whether PPy wires still exhibit useful volume changes at the nanoscale. Nanowires with a 50 nm diameter and a length of approximately 6 mu m, are fabricated by chemical polymerization using track-etched polycarbonate membranes as templates. Their actuation response as a function of oxidation state is investigated by electrochemical AFM ( atomic force microscopy). An estimate of the minimum actuation force is made, based on the displacement of the AFM cantilever.
机译：纳米级执行器是NEMS（纳米机电系统）和未来纳米机器人的必不可少的组成部分，并有望成为纳米技术发展的主要领域。本文首次证明了直径小于100 nm的单个聚吡咯（PPy）纳米线表现出驱动行为，因此可以潜在地用于构建纳米级驱动器。 PPy是一种电活性聚合物，可以根据其氧化态改变体积。已经演示了基于PPy的大型和微型执行器，但是直到现在，它们的纳米级执行器尚未实现。此处报道的研究肯定地回答了PPy线是否仍在纳米级上显示出有用的体积变化这一基本问题。通过化学聚合，使用径迹蚀刻的聚碳酸酯膜作为模板，制造直径为50 nm，长度约为6μm的纳米线。通过电化学原子力显微镜（原子力显微镜）研究了它们作为氧化态的函数的驱动响应。根据AFM悬臂的位移估算最小致动力。

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