高分散球形银粉制备研究

摘要

Using hydroquinone and mono-ethanolamine as the dispersant and pH regulator, the high performance spherical silver powders were prepared by chemical reduction. The effects of mono-ethanolamine addition on the silver performance were studied. The results showed that the spherical silver powders of 1.49 µm in average particle size and 2.16 g/cm3 in bulk density were obtained under the conditions of the adding amount of mono-ethanolamine was 250%of silver nitrate amount. XRD, EDS, and SEM analyses indicated that the silver particles are spherical shape, they have high purity, low impurity content, high crystallinity and good dispersity. The electrode silver paste prepared by these silver powders was screen printed on the silicon wafer, the square resistance of it is 5.26 mΩ/□, it satisfies electric requirement of electrode silver paste for solar cells.%采用液相化学还原法，以一乙醇胺为分散剂和pH值调节剂，用对苯二酚直接还原硝酸银制备高性能球形银粉。研究了一乙醇胺添加量对银粉性能的影响，在一乙醇胺添加量为硝酸银质量的250%时，可以制得平均粒径D50为1.49µm，松装密度达到2.16 g/cm3的规则球形银粉。通过X射线衍射(XRD)和能谱仪(EDS)分析表明，银粉纯度高，杂质含量少。扫描电镜(SEM)表征发现，银粉结晶度高，呈规则的球形颗粒，团聚少，分散性能好。将所得银粉制备成太阳能电池电极银浆，通过丝网印刷在硅片上，测量其方阻为5.26 mΩ/□，满足制作太阳能电池电极银浆的电性能要求。