Preparation of ITO nano-powders by hydrothermal-calcining process

Abstract

Sn-doped In₂O₃ (ITO) nano-powders were prepared by hydrothermal-calcining process. Using SnCl₄ · 5H₂O and In as starting materials, the crystallites were characterized by XRD, TEM and BET. The effects of the conditions on the product were investigated. The results show that the phase of hydrothermal precursor obtained by hydrothermal process is related to the temperature of hydrothermal reaction, i. e., the phases are amorphous In(OH)₃ in 160–180 °C; In(OH)₃ crystal in 200 °C and (In_1−x Sn_x) OOH crystal in 200–300 °C. ITO nano-powders with hexagonal structure and average size of 65 nm are obtained by calcining the precursor derived from the hydrothermal process at 350–650 °C. The BET of ITO crystal can reach 84. 023 4 m² · g⁻¹.

Keywords

ITO / hydrothermal-calcining process / hexagonal structure