Effects of Calcination Temperature Induced High-sensitivity N,N-dimethylformamide Gas-Sensing Performances Over LaFeO₃Nanoparticles

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 as 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℃ shows excellent response (Rg/Ra=189.2), great selectivity, and long-term stability to 100 ppm DMF at the operating temperature of 170℃. The effects of different calcination temperatures (650℃, 750℃, 900℃) on the structure and properties of LaFeO3 were compared. The structural characterization data revealed that LaFeO3 calcined at 750℃ 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℃ has the highest concentration of adsorbed oxygen, which also provides an excellent environment for gas-sensitive reactions on the surface of the material. Therefore, LaFeO3 is expected to be a potential novel material in DMF detection.

Enhanced acetone gas sensing performance of ZnO polyhedrons decorated with LaFeO3 nanoparticles

“…Element C was present as an additive and was used to calibrate the XPS measurement spectra. In order to investigate the chemical states of elements other than element C, the XPS spectral peaks of each element were and 3d 3/2 , respectively, indicating that La ions are present in the form of La 3+ [39,40]. The asymmetric XPS spectrum of Fe 2p (figure 5(d)) can be decomposed into four components.…”