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A synthesis and sensing application of hollow ZnO nanofibers with uniform wall thicknesses grown using polymer templates

机译:使用聚合物模板生长的壁厚均匀的空心ZnO纳米纤维的合成及传感应用

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摘要

A novel approach is applied to fabricating hollow ZnO nanofibers (ZNFs) with uniform wall thicknesses. In this approach, polymers synthesized by electrospinning are used as sacrificial templates and ZnO is subsequently deposited on these templates using atomic layer deposition, which makes ZnO uniformly cover the round surface of the polymer nanofibers. Heat treatments result in the selective removal of the polymer templates and the formation of hollow ZNFs with very uniform wall thicknesses. To test a potential use of hollow ZNFs in chemical gas sensors, their sensing properties with regard to O_2, NO_2, and CO are investigated in a comparative manner with those of normal ZnO nanofibers. The excellent sensing properties observed in the hollow ZNF sensor are ascribed to (1) the more pronounced change in resistance due to the presence of nanograins and (2) the doubling of the surface-to-volume ratio due to the generation of inner surfaces.
机译:一种新颖的方法被应用于制造具有均匀壁厚的中空ZnO纳米纤维(ZNFs)。在这种方法中,将通过静电纺丝合成的聚合物用作牺牲模板,然后使用原子层沉积法将ZnO沉积在这些模板上,这使ZnO均匀地覆盖了聚合物纳米纤维的圆形表面。热处理导致选择性除去聚合物模板,并形成壁厚非常均匀的中空ZNF。为了测试中空ZNF在化学气体传感器中的潜在用途,以与常规ZnO纳米纤维比较的方式研究了它们对O_2,NO_2和CO的传感特性。在中空ZNF传感器中观察到的出色的传感性能归因于(1)由于存在纳米晶粒而导致电阻变化更加明显,以及(2)由于产生了内表面而使表面体积比增加了一倍。

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