Enhanced acetone sensing performance based on hollow coral-like SnO2-ZnO composite nanofibers

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 degrees 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.