自还原体系银导电墨水的制备与低温印制导电图形的研究

Preparation of self-reductive silver inks and studying on fabrication of conductive patterns at low temperatures

总结了开发一种简便快捷的可印制在挠性基板上于低温条件实现烧结形成高导电性线路的自还原型银导电墨水的制备方法。该导电墨水通过混合二乙醇胺溶液和银氨溶液制备得到。印制在塑料基材上后,在75℃下固化形成导电线路。这是因为在碱性环境与高于50℃的温度下,二乙醇胺可分解生成甲醛并自发地与银氨溶液发生反应。随后还原出银原子并让其吸附在基材上形成银薄膜。用该方法印制得到的银线其导电率可达到金属银导电率的20%,通过继续改进可应用于各种印制电子技术中。

In this paper we will report a convenient and efficient method to generate silver tracks with high electrical conductivity on flexible substrates at low sintering temperatures by using a self-reductive silver inks. The inks are prepared by the mixture of Diethanolamine （DEA） solution and silver ammonia solution： After being printed on substrate, silver inks were sintered at 65℃ generating conductive tracks. Because ur/der the condition of alkaline and higher temperatures than 50℃, formaldehyde generated from DEA would spontaneously react with silver ammonia ions. Subsequently the sliver atoms would be reduced and adsorb on the substrate forming a silver thin films. The resulting conductivity of the printed silver tracks using this method can reach 20% of the bulk silver value, which enables various applications of printed electronics technologies.