Synthesis of α-Fe2O3 nanobelts and nanoflakes by thermal oxidation and study to their magnetic properties

► The uniform α-Fe2O3 nanobelts and nanoflakes were synthesized by annealing the iron-coated ITO glass in air. ► The shape-dependent magnetic property is investigated. ► The mechanism of the growth of α-Fe2O3 nanobelts and nanoflakes were discussed.