Abstract
Recently, field effect transistor type N,N-dimethylformamide (DMF) sensors have been widely studied, but semiconductor resistance type DMF gas sensors have not been reported much. Herein, porous LaFeO3 nanoparticles were prepared by reverse co-precipitation, and the gas sensing detection performance of material was studied. The sensor based on LaFeO3 calcined at 750 °C shows excellent response (Rg/Ra = 189.2), great selectivity and long-term stability to 100 ppm DMF at the operating temperature of 170 °C. The effects of different calcination temperatures (650 °C, 750 °C, 900 °C) on the structure and properties of LaFeO3 were compared. The structural characterization data revealed that LaFeO3 calcined at 750 °C has the appropriate specific surface area and abundant active sites, which plays a key role in promoting the adsorption and decomposition of target gas. In addition, the surface of the LaFeO3 calcined at 750 °C has the highest concentration of adsorbed oxygen, which also provides an excellent condition for gas-sensitive reactions on the surface of the material. Therefore, LaFeO3 is expected to be a potential novel material in DMF detection.
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