Deposition of hollow sphere In2O3 coatings by liquid flame spray

Hollow sphere In(OH) 3 coatings were deposited by a simple liquid flame spray with hollow sphere In(OH) 3 suspension, which was synthesized by improved soft template methods. The morphology of the In(OH) 3 was well preserved and oxygen vacancies were produced in the harsh thermomechanical environment of the flame spraying process. The In 2 O 3 coatings and In 2 O 3 powder were obtained by calcinating the In(OH) 3 coatings and In(OH) 3 precursor, respectively. The thickness of the coatings increased from 12 to 22 μm as the diameter of the feed nozzle increased, and the interconnection between the single hollow spheres In 2 O 3 in the coatings was better than that of the as-synthesized In 2 O 3 powder. The diameter of the single hollow spheres In 2 O 3 in the coatings was about 1.2∼1.4 μm, which is similar to the as-synthesized In 2 O 3 powder. The In 2 O 3 coatings with hollow spheres possessed a very high specific surface area, excellent interconnections, controllable thickness and numerous oxygen defects.