Abstract:

Using FeCl3·6H2O as the precursor and poly(vinyl pyrrolidone) (PVP, Mw=8 000) as the surfactant, we synthesized α-Fe₂O₃ with bundleflowerlike hierarchical architectures through a hydrothermal reaction combined with subsequent calcination process. The sample structure was characterized by field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). The results show that the sample structure is assembled by a rod bundle, each of which consists of a number of single crystal nanorods; the sensor  made by this structure has good selectivity and high response to acetone at 200 ℃.

Key words: hydrothermal method, semiconductor, bundleflowerlike nanostructure, gas sensor