【摘要】 本工作以硝酸银为银前驱体，抗坏血酸为还原剂，结合表面活性剂的作用，制备了平均粒径为(1.88±0.25)μm的球形银颗粒，同时，研究了还原体系中表面活性剂对银颗粒形貌及尺寸分布的影响，结果表明，柠檬酸三钠能够促进片状纳米银的形成。片状纳米银在长链表面活性剂(阿拉伯树胶、聚乙烯吡咯烷酮、聚乙二醇4000的质量比为4∶1∶1)存在时能够发生有序的自组装，得到表面相对光滑、粒径分布均匀的高球形度银颗粒。抗坏血酸的还原能力随着pH值的增加而逐渐增强。此外，本工作将所得银颗粒与有机载体及玻璃粉混合，通过丝网印刷于硅基底上，850℃烧结后，得到电阻率为3.11μΩ·cm的导电厚膜。更多还原

【Abstract】 Spherical silver particles with an average diameter of(1.88±0.25) μm were prepared by a chemical solution approach using silver nitrate as precursor and ascorbic acid as reducing agent in the assistance of several surfactants. The effects of the surfactants on the morphology and size distribution were investigated. The results showed that tri-sodium citrate could promote the formation of silver nanoflakes. When the mass ratio of Arabic gum, polyvinylpyrrolidenone and polyethylene glycol 4000 was 4∶1∶1, the silver nanoflakes could be self-assembled to micron-sized silver particles with smooth surface and uniform particle size distribution. The reducing ability of ascorbic acid increased with increasing pH value. The as-prepared silver particles were mixed with organic carrier and glass powders to form a paste which was then screen-printed on a silicon substrate and sintered at 850 ℃ to form a conductive thick film with a resistivity of 3.11 μΩ·cm.更多还原