Synthesis of FeVO₄ Nanoparticles and Sensing Performance for Ethanol Gas under Different Solution pH

Abstract

FeVO 4 nanoparticles are synthesized by the hydrothermal method. The effect of micromorphology under different pH conditions is investigated. Their microstructure, morphology, and chemical composition are analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and N 2 adsorption-desorption. The results showed that an increase in pH leads to agglomeration of the material. The effect of different pH conditions on the gas-sensitive performance of FeVO 4 is subsequently investigated, and the best response performance of the FeVO 4 sensor is achieved at a pH of 3. The consequences showed that the FeVO 4 sensor has a response of 3.383 to 100 ppm ethanol gas, with the response and recovery time of 1 and 7 s. The response cycle test has proved that FeVO 4 has good stability. Analyzed in conjunction with the characterization results, the oxygen vacancies on the surface of the nanoparticles not only improve the electronic conductivity but also provide active sites for the adsorption of gases, which helps to improve the sensitivity of the material to gases.

Synthesis and Characterization of Ferric Vanadate Nanorods for Efficient Electrochemical Detection of Ascorbic Acid

“… 22 Using a hydrothermal process, Che et al produced Pb-doped FeVO 4 nanotubes that respond to ethanol at 200 ppm. 23 It has been predicted that the sensing properties of nanosized FeVO 4 would be better than those of bulk FeVO 4 since the sensitivity of a sensor material greatly depends on surface qualities. 24 The utilization of electrode materials for enhanced energy storage applications calls for the usage of layered alkali-containing 3d transition-metal oxides.…”

“…Additionally, iron (Fe) and vanadium (V) have an indirect band gap and a better redox reaction compared to other metal vanadates, making them an excellent choice for a variety of EC applications . Using a hydrothermal process, Che et al produced Pb-doped FeVO 4 nanotubes that respond to ethanol at 200 ppm . It has been predicted that the sensing properties of nanosized FeVO 4 would be better than those of bulk FeVO 4 since the sensitivity of a sensor material greatly depends on surface qualities .…”