MOF-derived synthesis of Co3O4 nanospheres with rich oxygen vacancies for long-term stable and highly selective n-butanol sensing performance

Abstract Long-term stability and selectivity are crucial for the practical application of gas sensors, which closely related to microstructure composition sensor materials. In this work, Co-based metal organic framework (MOF) is used as a precursor prepared by simple hydrothermal method. After calcination, series Co3O4 nanospheres with various microstructures derived. When calcination temperature increases from 300 °C 500 °C, changed rough solid porous, then transformed into porous core-shell. assembled structure calcined at 400 °C (Co3O4-400) show highly selective response 53.78 100 ppm n-butanol operating 140 °C. Moreover, theoretical limit detection was calculated be 150 ppb. The reproducibility, were further verified excellent. 45 days, value Co3O4-400 86.74%, even after 75 remains 74.93%. main reason can attributed large specific surface area, abundant pore number oxygen vacancies on its surface. These findings provide reference development p-type oxide semiconductor (MOS) sensors long-term high performance.