Abstract
? 2022 Elsevier B.V.The heterostructure of metal oxide and other materials is one of the important ways for the development of electronic devices. The Bi2MoO6 (BMO)/ZnO composites were synthesized by secondary hydrothermal method. The morphology and crystal structure of the compound were characterized by scanning electron microscopy, EDS mapping, X-ray photoelectron spectroscopy, transmission electron microscopy, nitrogen physical adsorption and X-ray diffraction. The synthesis technology and gas sensitivity of BMO and BMO/ZnO composites were discussed. The results showed that BMO and BMO/ZnO had better butanol gas sensitivity, faster response rate, lower working temperature, and good stability. Compared with methanol, benzene, methyl alcohol, ethanol, and acetone, BMO/ZnO sensor showed good selectivity to butanol at 270 ℃. The response time and recovery time for 100 ppm butanol were about 6 s and 33 s, respectively, the response value up to 128. The n-n type BMO/ZnO composites with unique microstructure has abundant diffusion channels, and the research work provides a valuable reference for the low-cost preparation of high-performance butanol sensors. The energy band, potential barrier and charge transfer of BMO/ZnO composites are discussed, and the optimization of their gas sensitivity is analyzed in detail.
NSTL
Elsevier