Template-free preparation of mesoporous single crystal In 2 O 3 achieving superior ethanol gas sensing performance

Mesoporous single crystal indium oxide (In 2 O 3 ) has been successfully prepared via a hydrothermal annealing route in the absence of templates and surfactants. An In 2 O 3 mesoporous single crystal has larger surface areas and smaller pore diameter, and thus exhibits better ethanol gas sensing properties than mesoporous In 2 O 3 with a large pore diameter which was prepared by adjusting the pH value.