Abstract
Flexibly controllable phase transition indium tin oxide (ITO) nano powders (NPs) were prepared by an environmentally friendly hydrothermal method. The characterization results show that ITO NPs undergo a novel phase transition from cubic phase to hexagonal phase with hydrothermal temperature increasing. Single cubic and hexagonal phase ITO NPs with a diameter of 150 and 20 nm were respectively synthesized at 120 and 250 ℃ hydrothermal temperature combined with a followed 550 ℃ calcination process. The fluorescence emission intensity of hexagonal ITO (h-ITO) NPs was stronger than the one of cubic ITO (c-ITO) NPs due to more oxygen vacancies.
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