Improved photocatalytic and gas sensing properties of α-Fe2O3 nanoparticles derived from β-FeOOH nanospindles

alpha-Fe2O3 nanoparticles were synthesized through calcining the as-synthesized spindle-like beta-FeOOH precursors at 600 degrees C. X-ray powder diffraction (XRD) and transmission electron microscopy (TEM) results showed that beta-FeOOH nanospindles with a diameter of similar to 50 nm and lengths up to 100-150 nm were readily changed to alpha-Fe2O3 nanoparticles with a size of 30-150 nm after heat-treatment for 2 h. The photocatalytic performances of the as-prepared samples were evaluated by photocatalytic decolorization of methylene blue (MB) in the presence of H2O2 at ambient temperature. The results indicated that the alpha-Fe2O3 nanoparticles exhibited the highest photocatalytic activity compared with the beta-FeOOH nanospindles and the commercial alpha-Fe2O3 powders. The gas-sensing measurement results demonstrated that the products showed an excellent gas response to ethanol and acetone. The results showed that these alpha-Fe2O3 nanoparticles may have potential applications in gas sensor and photocatalysts. (C) 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved.