The effect of surface morphology on the response of Fe2O3-loaded vanadium oxide nanotubes gas sensor

► Attempts were first made to control the particle size and deposition of Fe2O3 by a novel citric acid-assisted hydrothermal method, where citric acid used as surfactant and chelate agent. ► The influence of the size and loading amount of Fe2O3 particles on the sensor response was been suspected. ► The effect of Fe2O3 loading amount on sensor response can indeed be explained as active sites. While, the effects of Fe2O3 particle size on the sensor resistance were interpreted in terms of the Debye length.