一步溶剂热法制备立方状ITO纳米粉体

One-Step Solvothermal Synthesis of Cubic ITO Nanopowders

摘要:

通过一步溶剂热法制备出导电性良好的立方状ITO纳米粉体。研究了不同溶剂、反应温度和反应时间对ITO粉体微观结构和电性能的影响。结果表明,以乙二醇为溶剂,在250 ℃下反应24 h,ITO纳米粉体的电阻率最低为0.2 Ω×cm,平均粒径为45.95 nm。随反应时间的延长,通过溶解-再结晶机制,棒状前驱体逐步向立方状In2O3转化。在In2O3晶体形成过程中,乙二醇和四甲基铵根离子吸附在晶体表面,使垂直于(200)晶面的生长速率降低,诱导形成立方状颗粒。

Abstract:

Low-resistivity ITO nanocubes were successfully prepared in one step by the solvothermal method. The microstructure and electrical properties of ITO nanoparticles can be adjusted by changing solvents, reaction temperature and reaction time. The results show that the lowest electrical resistivity and the average size of ITO nanoparticles was 0.2 Ω×cm and 45.95 nm respectively when the reaction temperature and time were 250 ℃ and 24 h respectively with ethylene acohol as solvent. As reaction time was prolonged, the rod-like indium hydroxides were transformed to cubic In2O3 nanoparticles gradually through the dissolution-recrystallisation mechanism. During the formation of In2O3 nanocrystals, the growth rate perpendicular to (200) plane reduced, caused by the adsorption of glycol and tetramethyl ammonium ion on the surface of particles, which induced the formation of cubic-shaped ITO nanoparticles.