Shape- and phase-controlled synthesis of In2O3 with various morphologies and their gas-sensing properties

Hexagonal In2O3 microspheres, cubic In2O3 porous nanoparticles, and cubic In2O3 porous nanorectangles were fabricated by calcining precursors at 450 °C, respectively. The precursors InOOH microspheres, In(OH)3 nanoparticles, and In(OH)3 nanorectangles were solvothermally synthesized by adjusting the volume ratios of ethylenediamine and distilled water in autoclave at 160 °C. Gas-sensing properties determination of ethanol, formaldehyde, and ammonia gases show that the cubic In2O3 porous nanoparticles have a higher response than the hexagonal In2O3 microspheres.