Construction of multi-walled carbon nanotubes/ZnSnO3 heterostructures for enhanced acetone sensing performance
Chinese Physics B(2023)
Abstract
Carbon nanotubes (CNTs) have attracted many researcher’s attention in gas sensing field because of their excellent physical and chemical properties. Herein, multi-walled carbon nanotubes (MWCNTs)/ZnSnO 3 heterostructures have been obtained by a simple hydrothermal method without additional annealing process. The structural and composition information are characterized by x-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM) and x-ray photoelectron spectroscopy (XPS). The acetone sensing properties of pure MWCNTs, ZnSnO 3 and MWCNTs/ZnSnO 3 heterostructures are systematically investigated, respectively. The results show that MWCNTs/ZnSnO 3 heterostructures have better sensing properties compared with pure MWCNTs and ZnSnO 3 sample. Specifically, MWCNTs/ZnSnO 3 heterostructures exhibit not only high responses of 24.1 and rapid response/recovery speed of 1 s/9 s to 100 ppm acetone, but also relatively good repeatability and long-term stability. The enhanced sensing performance is analyzed in detail. In addition, this work provides the experimental and theory basis for synthesis of high-performance MWCNT-based chemical sensors.
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Key words
carbon nanotubes/znsno<sub>3</sub>,acetone,multi-walled
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