Abstract
This paper demonstrated a high-performance ozone gas sensor based on metal-organic frameworks (MOFs)-derived In2O3 hollow microtubes decorated with ZnO nanoparticles. The microstructural and morphological features of as-synthesized In2O3/ZnO samples were characterized by various characterization methods, such as XRD, TG, SEM, TEM and XPS. The sensing properties of In2O3 hollow microtubes before and after modified by ZnO nanoparticles were investigated. The In2O3/ZnO composite shows an obvious enhancement in ozone gas sensing performance at the optimum working temperature of 150 °C. The In2O3/ZnO composite sensor shows much higher response (Rg/Ra = 26.12 @ 1 ppm ozone) in contrast with pure In2O3 (Rg/Ra = 14.08 @ 1 ppm ozone). In particular, the detection limit of the In2O3/ZnO sensor is as low as 25 ppb. The enhanced sensing performance of the In2O3/ZnO composite could be explained by the Zn2+ doping and heterojunction created at the In2O3/ZnO interface.
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