Transparent conducting coatings made from redispersable crystalline nanoscaled powders

摘要

A new wet chemical concept is presented for the preparation of electrically conducting SnO_2:Sb (ATO) and In_2O_3:Sn (ITO) coatings. It is based on the deposition by spin, dip or spray techniques of a solution containign crystalline nanoscaled particles fully redispersable in a solvent. The particle synthesis is carried out in a solution at temperatures < 200 deg C by a controlled growth reaction using SnCl_4 and InCl_3 as precursors and SbCl_3 and SnCl_4 as dopant, respectively. The aggregation of the particles is avoided by in-situ surface modification with bifunctional organic molecules. After drying the nanocrystalline particles can be fully redispersed in ethanol at pH<6 (for ITO) or water at pH>8 (for ATO) with solid contents up to 8.8 vol.