Highly sensitive ethanol gas sensor based on In2O3 spheres

In2O3 spheres were successfully prepared by nitric acid-assisted solvothermal method. The morphology and structure of the products can be controlled by the content of nitric acid. After adding with nitric acid, the sensing performance of In2O3 has been improved. In particular, the In2O3 spheres with partial broken structures prepared with 100 μL nitric acid show high response of 250 to 50 ppm ethanol at the operating temperature of 250 °C and exhibit good selectivity and stability.