Abstract SnO2/Co3O4 nanofibers (NFs) are synthesized by using a homopolar electrospinning system with double jets of positive polarity electric fields. The morphology and structure of SnO2/Co3O4 hetero-nanofibers are characterized by using field emission scanning electron microscope (FE-SEM), transmission electron microscope (TEM), x-ray diffraction (XRD), and x-ray photoelectron spectrometer (XPS). The analyses of SnO2/Co3O4 NFs by EDS and HRTEM show that the cobalt and tin exist on one nanofiber, which is related to the homopolar electrospinning and the crystallization during sintering. As a typical n-type semiconductor, SnO2 has the disadvantages of high optimal operating temperature and poor reproducibility. Comparing with SnO2, the optimal operating temperature of SnO2/Co3O4 NFs is reduced from 350℃ to 250℃, which may be related to the catalysis of Co3O4. The response of SnO2/Co3O4 to 100-ppm ethanol at 250℃ is 50.9, 9 times higher than that of pure SnO2, which may be attributed to the p-n heterojunction between the n-type SnO2 crystalline grain and the p-type Co3O4 crystalline grain. The nanoscale p-n heterojunction promotes the electron migration and forms an interface barrier. The synergy effects between SnO2 and Co3O4, the crystalline grain p-n heterojunction, the existence of nanofibers and the large specific surface area all jointly contribute to the improved gas sensing performance.
Zhao Wang(王昭), Shu-Xing Fan(范树兴), and Wei Tang(唐伟) SnO2/Co3O4 nanofibers using double jets electrospinning as low operating temperature gas sensor 2022 Chin. Phys. B 31 028101
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