Abstract
• Hollow Ag-doped Fe 2 O 3 nanofibers with large specific surface area were prepared by simple electrospinning. • Ag-doped Fe 2 O 3 composites sensor exhibits a superior response and selectivity for H 2 S. • The gas sensing mechanism of Ag-doped Fe 2 O 3 nanofibers was studied by O 2 -TPD, H 2 -TPR and DFT calculations. In this paper, a simple method to synthesize Ag-doped Fe 2 O 3 hollow nanofibers by electrospinning was reported. The synthesized samples were fabricated into gas sensors, and their sensing properties were studied systematically. The results showed that the Ag-doped Fe 2 O 3 materials were hollow tubular structures and had high response (R a /R g = 19.43), selectivity and sensitivity to H 2 S at room temperature. The response mechanism of the sensor to H 2 S was studied by DFT, O 2 -TPD and H 2 -TPR. It was considered that the excellent gas sensing performance of the sensor was that the Ag-dopant increased the concentration of carriers, adsorbed oxygen and lattice oxygen. The rough hollow structure was conducive to gas adsorption and capture, which provided many active centers for the sensing reaction. Therefore, the Ag-doped Fe 2 O 3 nanofibers with hollow structure will have promising uses as sensing material in future applications.
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