Department of Graphic Arts Information Engineering, Pukyong National University, Yongdang-dong, Nam-gu, Busan, 608-739, Republic of Korea.
Nanoscale. 2014 Jan 7;6(1):630-7. doi: 10.1039/c3nr04645a. Epub 2013 Nov 19.
We report the exothermic reaction route and new capability of a self-heatable conductive ink (Ag2O and silver 2,2-dimethyloctanoate) in order to achieve both a low sintering temperature and electrical resistivity within a short sintering time for flexible printed electronics and display appliances. Unlike conventional conductive ink, which requires a costly external heating instrument for rapid sintering, self-heatable conductive ink by itself is capable of generating heat as high as 312 °C when its exothermic reaction is triggered at a temperature of 180 °C. This intensive exothermic reaction is found to result from the recursive reaction of the 2,2-dimethyloctanoate anion, which is thermally dissociated from silver 2,2-dimethyloctanoate, with silver oxide microparticles. Through this recursive reaction, a massive number of silver atoms are supplied from silver oxide microparticles, and the nucleation of silver atoms and the fusion of silver nanoparticles become the major source of heat. This exothermic reaction eventually realizes the electrical resistivity of self-heatable conductive ink as low as 27.5 μΩ cm within just 40 s by combining chemical annealing, which makes it suitable for the roll-to-roll printable electronics such as a flexible touch screen panel.
我们报告了一种自热导电油墨（氧化银和银 2,2-二甲基辛酸盐）的放热反应途径和新功能，以实现柔性印刷电子和显示设备在短烧结时间内的低烧结温度和低电阻率。与传统导电油墨需要昂贵的外部加热仪器进行快速烧结不同，自热导电油墨本身能够在 180°C 的温度下触发放热反应时产生高达 312°C 的热量。这种强烈的放热反应是由 2,2-二甲基辛酸盐阴离子的递归反应引起的，该阴离子从银 2,2-二甲基辛酸盐中热解出来，并与氧化银微粒反应。通过这种递归反应，大量的银原子从氧化银微粒中供应，银原子的成核和银纳米粒子的融合成为主要的热源。这种放热反应最终通过化学退火实现了自热导电油墨的电阻率低至 27.5 μΩ·cm，仅需 40 秒，使其适合卷对卷可打印电子，如柔性触摸屏面板。
