Abstract
SO2 gas sensors based on ZnO nanostructures under wild conditions are used widely yet an insufficient electron transfer channels limit the enhancement of the gas-sensing performance. Herein, we report well-ordered ZnO nanowire-networks with interconnected junctions via a simple solution-processing method by adjustment of additive to produce remarkable SO2 gas-sensing performance: low detection limit of 200 ppb, fast response-recovery speed (102 and 58 s) and high response value (8.28) to 10 ppm SO2 at work temperature of 200 °C. The 3D net-work ZnO arrays with fully interconnected junctions, rich oxygen vacancies, and high conductivity are confirmed. Furthermore, the SO2 gas mechanism related to the interjunctions is also clarified. This research offers a novel strategy for designing high performance ppb-level SO2 gas sensor.
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