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首页> 外文期刊>RSC Advances >Selectively enhanced sensing performance for oxidizing gases based on ZnO nanoparticle-loaded electrospun SnO2 nanotube heterostructures
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Selectively enhanced sensing performance for oxidizing gases based on ZnO nanoparticle-loaded electrospun SnO2 nanotube heterostructures

机译：基于ZnO纳米颗粒加载的ElectroTum SnOtoTume的氧化气体选择性地增强了氧化气体的感测性能

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摘要

In this work, we present gas sensors based on ZnO nanoparticle-loaded electrospun SnO _(2) nanotube (ZnO/SnO _(2) ) n–n heterostructures (HSs) synthesized by electrospinning combined with facile thermal decomposition. The sensing properties of the pristine SnO _(2) nanotubes (NTs) and ZnO/SnO _(2) HSs were investigated toward the representative oxidizing (NO _(2) ) and reducing (H _(2) , CO) gases. Results show that the as-prepared ZnO/SnO _(2) HSs exhibit selectively enhanced and diminished sensing performances for oxidizing and reducing gases, respectively. These phenomena are closely associated with the modulation of the local depletion layer on the surface of SnO _(2) nanoparticles (NPs) caused by charge transfer at the heterojunctions due to work function difference. A modified grain boundary-controlled sensing mechanism is proposed to describe charge transport in sensing layers based on the contact potential barriers between nanoparticles. Our study indicates that the selection of material system and their synergism are keys to the effective design of gas sensors with semiconducting metal oxide HSs.
机译：在这项工作中，我们通过静电纺丝结合容易​​热分解，基于ZnO纳米颗粒加载的Electrome SnO _（2）纳米管（ZnO / SnO _（2））N-N异质结构（HSS）的气体传感器。研究了原始SnO _（2）纳米管（NTS）和ZnO / SnO _（2）HSS的感测性能朝向代表性氧化（NO _（2））和还原（H _（2），CO）气体。结果表明，如制备的ZnO / SnO _（2）HSS分别表现出氧化和减少气体的选择性增强和减少的感测性能。这些现象与在由于工作函数差异的异质函数的电荷转移引起的SnO _（2）纳米颗粒（NPS）表面上的局部耗尽层的调节密切相关。提出了一种改进的晶粒结构边界控制的传感机构，以描述基于纳米颗粒之间的接触电位屏障的感测层的电荷传输。我们的研究表明，材料系统的选择及其协同作用是具有半导体金属氧化物HSS的气体传感器的有效设计的关键。

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