Study Of Preparation And Properties Of Antimony Doped Tin Oxide Conductive Powder

Antimony doped tin oxide (ATO) material is a new functional material with great development potential, and it has good optical and electrical performance.Using tin particles and antimony trioxide as main raw materials, ATO conductive powder was prepared by co-precipitation method. The influence regulation of parameters were studied, comprehensive experimental study has been made in optimal conditions. Researches on anti-aggregation and surface modification have been made.The optimal technological conditions of ATO conductive powder prepared by co-precipitation method were as follows: using tartaric acid as complexing agent, titrate pH value was 3, antimony doping quantity was 7% (mole fraction), reaction temperature was 60℃, calcination temperature was 700℃, and holding time was 2h. The results showed that the crystallinity of ATO conductive powder was perfect, the phase of powder was still tetragonal rutile structure, the resistivity was 11.56Ω·cm, the average grain size was about 20nm, and the specific surface area was 30.56m²Â·g^-1.The effect of anti-agglomeration was increased by microwave drying method and butanol azeotropic distillation method. The results showed that using microwave drying method, the drying time and the possibility of powder agglomeration were reduced greatly, and the specific surface area of the powder was 35.29m²Â·g^-1; using butanol azeotropic distillation method, the water and the free hydroxyl groups of the precursor were removed effectively, and the specific surface area of the powder was 40.92m²Â·g^-1.The surface modification of ATO conductive powder was studied with silane coupling agent KH-570. According to orthogonal experiment, the optimal technological conditions were determined: coupling reaction temperature was 80℃, the dosage of silane coupling agent was 10%, and coupling reaction time was 4h. The results showed that silane coupling agent had the chemical reaction with the hydroxyl groups on the surface of ATO powder. The dispersibility of powder increased compared with bare ATO.