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Effect of the wall thickness on the gassensing properties of ZnO hollow fibers

机译：壁厚对ZnO中空纤维气敏性能的影响

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摘要

ZnO hollow fibers (HFs) with a range of wall thicknesses were synthesized by electrospinning and atomic layer deposition. The effects of the wall thickness of the HFs on their sensing properties were examined using CO as a representative reducing gas. The thin-walled HFs showed improved sensor responses to CO compared to thick-walled HFs. Most importantly, despite the polycrystalline nature of HFs, their sensing abilities were determined mainly by the wall thickness, not by the size of the nanograins or crystalline quality. In particular, the resistance modulation was attributed mainly to radial suppression/broadening of the underlying conducting channel during adsorption/desorption of gas species on both the inner and outer surface.
机译：通过静电纺丝和原子层沉积合成了具有一定壁厚的ZnO中空纤维（HFs）。使用CO作为代表性的还原气体，检查了HF的壁厚对其感测性能的影响。与厚壁HF相比，薄壁HF显示出对CO的改进的传感器响应。最重要的是，尽管HF具有多晶性质，但其感应能力主要取决于壁厚，而不取决于纳米颗粒的大小或晶体质量。特别地，电阻调节主要归因于在内表面和外表面上的气体种类的吸附/解吸期间径向抑制/扩大了下面的导电通道。

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