“…have been widely applied as photocatalyst, functional ceramics, sensor, solar cell and biology functional material. [5][6][7][8][9] Among the various kinds of nanomaterials, iron oxide as an important oxide has been studied for a wide range of applications because it is environmentally friendly, non-toxic, heat-resistant, and corrosion-resistant material. 10,11 At the same time, because of the low density, large surface, high stability, and remarkable sensitivity of the conductivity to temperature, humidity and concentration, the Fe 2 O 3 semiconductor shows a broad and good prospect for application in the eld of sensing materials.…”