Abstract
The microstructure of ZnO nanomaterials determines their sensing performance. Here, porous spherical ZnO nanomaterials were synthesized by hydrothermal combined with high temperature calcination using zinc acetate, urea, sodium citrate, and oxalic acid as raw materials. The ZnO nanomaterials exhibit excellent response and fast response/recovery behavior towards NO at room temperature. The response to 0.5 ppm NO reached 3.08, and the response and recovery times were less than 35 s in the concentration range of 0.5 ∼ 8.0 ppm. The introduction of oxalic acid improved crystallinity, increased the oxygen vacancy content and selective response to NO at room temperature. The results show that ZnO can be used as an ideal candidate material for detecting NO at room temperature.
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