Abstract
A solvothermal method combined with a liquid-based metal organic framework synthesis route was used to synthesize uniform Co3O4/Fe3O4 nanospheres. Different ratio of Co3O4 was used to functionalize Fe3O4, and enhanced toluene sensing performance was achieved. The maximum toluene response value is 87 at 225 °C, which is 20 times of pure Fe3O4 nanospheres based gas sensor. Also, after functionalization with Co3O4, better selectivity and sensitivity were obtained compared with pure Fe3O4 nanospheres. The best performing gas sensor has a response/recovery time of 16/162 s, and the detection limit is decreased to ppb level. In addition, the sensor showed excellent repeatability and long-term stability. The mechanism of the improved sensing performance was detailly analyzed, which were primarily attributed to the construction of p-n heterojunctions at the interface of the p-type Co3O4 and the n-type Fe3O4, and the catalytic influence of Co3O4. This work provides an appropriate way for the sensitization of Fe3O4 in toluene sensing.
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