Preparation Of Organic Acid Silver Based Conductive Ink And Properties Characterization Of Silver Film

The printed electronics is a technology of printing or depositing the ink onto thesubstrates by printing to form electric circuit, which has small environmentalpollution, high efficiency and so on. The key of this technology is the development ofconductive ink. Particle-free conductive ink with simple composition and lowheat-treatment can satisfy the demands of flexible substrates and then is attractedwidespread attention.In this paper, we chose organic acid silver as silver resource, fatty amine ascomplex agent and alcohol as solvents to prepare the particle-free conductive ink. Onthe one hand, for the component properties and formula of conductive ink, this paperinvestigated the silver source, complex agent, solvent, additives and other componentson the properties of conductive ink. It turned out that silver malate,2-butylamine andethylene glycol were the best of silver source, complex agent and solvent respectively.At the same time, the additives played the role of adjusting the viscosity and surfacetension of conductive ink. On the other hand, for the process conditions of thepreparation of conductive ink, we investigated the preparation temperature and timeeffect on the character of conductive ink. The result showed that the preparationtemperature had a great effect on the conductive ink, the optimal preparationtemperature was25℃. However, the preparation time had a relatively small impacton the thermal behavior of conductive ink. Considering the efficiency of industrialproduction, the best preparation time was30min.In conclusion, the conductive ink was prepared with silver malate as silversource,2-butylamine as complex agent and the best mixed solvent ratio. Then weinvestigated the silver films obtained in different of thermal temperature, thermal timeand substrates. It turned out that the higher thermal temperature and longer thermaltime, the higher crystallinity and conductivity of silver film. Furthermore, thearrangement of silver nanoparticles was more and more uniform.