Abstract
The effect of surface morphology on the response of an ethanol sensor based on vanadium nanotubes surface loaded with Fe 2O 3 nanoparticles (Fe 2O 3/VONTs) was investigated in this work. The particle size of Fe 2O 3 loaded on VONTs was varied by using novel citric acid-assisted hydrothermal method. In the synthesis progress, citric acid was used as a surfactant and chelate agent, which ensured the growth of a uniform Fe 2O 3 loading on the nanotubes surface. The ethanol sensing properties was then measured for these Fe 2O 3/VONTs at 230–300 °C. The results showed that the sensor response increased with the particles size and the loading amount of Fe 2O 3. It appears that the load of Fe 2O 3 on the VONTs surface increases the concentration of oxygen vacancies and decreases the concentration of free electrons. The effects of morphology on the sensor resistance were interpreted in terms of the Debye length and the difference in the number of active sites.
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