缓冲溶液和分散剂对共沉淀法制备纳米级ITO粉体的影响

The effects of buffer solution and dispersant on indium tin oxide nanopowdersprepared by co-precipitation

摘要:

本文用化学共沉淀法制备ITO粉体,分别将NH₄Cl-NH₃H₂O、(NH₄)₂SO₄-NH₃H₂O和NH₄AC溶液作为缓冲溶液,保持反应过程中pH值基本不变,采用可溶性淀粉、PVP、十二烷基磺酸钠作为分散剂,借助XRD、TEM、BET及四探针电阻仪,研究缓冲溶液和分散剂对制得粉体的物相、形貌、分散性及导电性能的影响。结果表明：采用缓冲溶液制备出的粉体为单相In₂O₃粉体,采用NH₄AC作为缓冲溶液,用淀粉作为分散剂,当pH值为6-7时,所制粉体的粒径在10nm左右,颗粒粒度均匀,分散性能好,形貌为立方体形,电阻率相对较低。

Abstract:

ITO nanopowders were prepared by chemical coprecipitation , NH₄Cl-NH₃H₂O,(NH₄)₂SO₄-NH₃H₂O and NH₄AC solution were used as buffer solution to remain the pH value unchanged, simultaneously, the powders were prepared with different dispersants, the effects of buffer solution and dispersant on pHase structure,morpHology ,conductivity and the dispersion were characterized by XRD, TEM,FourSpoint probe and BET .The results show that the powders prepared with the buffer solution is single-pHase In₂O₃ structure.When the nanopowders prepared under the conditions of NH₄AC as buffer solution, soluble starches as dispersant, the pH value 6 to 7, the obtained powder is with about 10 nm particle size,uniform particle size, and good dispersibility ,and simultaneously the powders is inerratic cubic shape with relatively good electrical conductivity.