Abstract
The acetone sensors are designed based on hollow coral-like SnO2–ZnO nanofibers (NFs) composite structure through a simple one-step electrospinning method in this paper. Compared with pure SnO2, SnO2–ZnO sensor has greatly enhanced acetone sensing performance including excellent sensitivity, rapid response which are due to its larger specific surface area, more oxygen vacancies and n–n composite structures. The response of SnO2–ZnO NFs sensor (110.95) is 20 times higher than that of the SnO2 sensor (5.52) and achieves a rapid response/recovery process (within 9/5 s) at 150 °C in 100 ppm acetone concentration which is expected to be applied in the non-invasive detection of diabetes. Moreover, the mechanism of the enhanced gas sensing based on hollow coral-like SnO2–ZnO NFs is analyzed in depth from energy band of n–n metal oxide semiconductors composite structures.
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