High performance detection of ethanol based on HoFeO3 microsphere gas sensor

The HoFeO3 gas sensitive material was prepared by simple hydrothermal method and high temperature calcination. In this work, XRD, EDX, SEM, and TEM characterization methods were used to analyze the HoFeO3 crystal structure and morphology features. The chemical valence state and binding energy of HoFeO3 were analyzed by XPS. The slightly rough surface morphology and low binding energy Ho–O bond can promote the better binding reaction of reducing gas molecules with the material surface, which is beneficial to enhance the gas sensitivity properties of the material. The HoFeO3 gas-sensitive material sensor shows excellent selectivity for ethanol gas, with a response value of 33 and fast response recovery time 12 s/11 s. Tested at a broad range of ethanol gas concentrations, 90% excellent adsorption and desorption rates are achieved. In addition, we have analyzed the sensing mechanism of the HoFeO3 gas sensor.