Department of Graphic Arts Information Engineering, Pukyong National University, Yongdang-dong, Nam-gu, Busan, 608-739, Republic of Korea.
Nanoscale. 2013 Jun 7;5(11):5043-52. doi: 10.1039/c3nr00962a. Epub 2013 May 2.
A rapid two-step metallization for fabrication of a "black" transparent conductive film on a flexible substrate for display applications is presented, using a mixture of silver oxide (Ag2O) and silver neodecanoate (C10H19AgO2), and its electrical conductivity and colour transition behaviours are investigated. Silver nanoparticles, which are physicochemically converted from silver oxide microparticles in the presence of silver neodecanoate in the course of the first metallization step at 150 °C for 10 min, are chemically annealed by immersing them in an acidic ferric chloride (FeCl3) solution at room temperature for 10 s. During this second metallization step, silver nanoparticles are found to be tightly packed through Ostwald ripening, which eventually leads to the dramatic enhancement of electrical conductivity by six orders of magnitude from 1.33 S m(-1) to 1.0 × 10(7) S m(-1), which corresponds to 15.9% of the electrical conductivity of bulk silver. In addition to the enhancement of electrical conductivity, the silver chloride (AgCl) layer formed on the surface of the silver layer due to ferric ions (Fe(3+)) enhances the blackness of the transparent conductive film by a factor of 1.69, from 36.29 B to 61.51 B. The sheet resistance and optical transparency of a roll-to-roll printed black transparent conductive film for a touch screen panel are found to be as low as 0.9 Ω□(-1) and 81%, respectively, after conducting the proposed two-step metallization.
一种用于在柔性衬底上制造用于显示应用的“黑色”透明导电膜的快速两步金属化方法，使用氧化银（Ag2O）和新癸酸银（C10H19AgO2）的混合物，并研究了其电导率和颜色转变行为。在 150°C 下进行第一金属化步骤 10 分钟的过程中，由于存在新癸酸银，银纳米粒子从氧化银微粒子物理化学转化而来，然后通过将其浸入室温下的酸性氯化铁（FeCl3）溶液中 10 秒进行化学退火。在第二金属化步骤中，发现银纳米粒子通过奥斯特瓦尔德熟化紧密堆积，最终导致电导率急剧提高六个数量级，从 1.33 S m(-1) 提高到 1.0×10(7) S m(-1)，这相当于块状银电导率的 15.9%。除了电导率的提高之外，由于铁离子（Fe(3+)）的存在，在银层表面形成的氯化银（AgCl）层使透明导电膜的黑色度提高了 1.69 倍，从 36.29 B 提高到 61.51 B。在对所提出的两步金属化进行处理后，发现用于触摸屏面板的卷对卷印刷黑色透明导电膜的面电阻和光学透明度分别低至 0.9 Ω□(-1) 和 81%。
