Fast Response Isopropanol Sensing Properties with Sintered BiFeO₃ Nanocrystals

BiFeO₃ nanocrystals were applied as the sensing material to isopropanol. The isopropanol sensor based on BiFeO₃ nanocrystals shows excellent gas-sensing properties at the optimum working temperature of 240 °C. The sensitivity of as-prepared sensor to 100 ppm isopropanol is 31 and its response and recovery time is as fast as 6 and 17 s. The logarithmic curves of the sensitivity and concentration of BiFeO₃ sensors are a very good linear in the low detection range of 2-100 ppm. In addition, the gas sensing mechanism is also discussed. The results suggest that the BiFeO₃ nanomaterial can be potentially applied in isopropanol gas detection.