无颗粒型银导电墨水的制备及其印刷成膜研究

以柠檬酸银为导电金属前驱体化合物，仲丁胺为络合剂，并添加乙醇调节粘度和表面张力等物性参数，制备了无颗粒型银导电墨水。该导电墨水可以采用凹版印刷方式印刷在PET片基上，并且在较低的热处理温度下即可获得导电性较好的银导电膜。利用X射线光电子能谱仪、同步热分析仪、红外光谱仪、X射线衍射仪、扫描电子显微镜和四探针测试仪对柠檬酸银、导电墨水以及银导电膜进行表征。结果表明导电墨水在132 ℃时残留质量即达到恒重，远低于柠檬酸银的210 ℃;经150 ℃热处理之后，银导电膜由均匀致密、纯度高的纳米银颗粒组成;经150 ℃热处理50 min后得到的银导电膜的方块电阻值为1.83 Ω·□-1。

Synthesis of Particle-Free Silver Conductive Ink and Investigation of Fabrication of Conductive Film by Printing

Particle-free conductive ink was prepared, taking silver citrate as conductive metal precursor, sec-butylamine as complexing agent and ethanol as media adjusting the viscosity and wettability. The ink could be printed on PET substrate by gravure printing, and silver conductive film with high electrical conductivity was obtained after thermal treated at low temperature. Silver citrate, silver citrate based conductive ink and silver conductive film were characterized with EDS, STA, IR, XRD, SEM and four point probe method. The results of STA showed that the mass of the conductive ink came to constant at 132 ℃ which is much lower than that of silver citrate (210 ℃); the results of SEM and XRD showed that the silver conductive film cured at 150 ℃ was constituted by compact silver nano particles with high purity; the result of four point probe method showed that its sheet resistance was 1.83 Ω·□-1.