Affordable Fabrication of Conductive Electrodes and Dielectric Films for a Paper-Based Digital Microfluidic Chip
Affordable Fabrication of Conductive Electrodes and Dielectric Films for a Paper-Based Digital Microfluidic Chip
复制标题
DOI：
10.3390/mi10020109
复制
发表时间：
2019-02-01
期刊：
影响因子：
3.4
通讯作者：
Shin, Kwanwoo
中科院分区：
文献类型：
--
作者：
Soum, Veasna;Kim, Yunpyo;Shin, Kwanwoo
为了制作数字微流控(DMF)芯片，我们探索了两种简单的方法：圆珠笔印刷产生电极，以及包裹介质塑料薄膜来覆盖电极。为了精确和可编程地打印图案化电极，我们使用了数字绘图仪，并使用了填充了纳米银(AgNP)墨水的圆珠笔。我们没有使用化学气相沉积、印刷和旋涂等传统的材料沉积方法来制备薄的介电层，而是使用了一种简单的方法，即通过简单的包裹，使用预制的线性低密度聚乙烯(LLDPE)塑料(17米厚)来制备薄的介质层。然后我们用薄薄的硅油层将其密封，这样它就可以用作DMF芯片。在170V以下的外加电压下，这种经过处理的介质层对无接触角滞后的固着液滴表现出了良好的电润湿性能。通过这种简单的制作方法，我们快速和廉价地制备了纸基DMF芯片，并演示了液滴的数字电液驱动和操纵。
In order to fabricate a digital microfluidic (DMF) chip, which requires a patterned array of electrodes coated with a dielectric film, we explored two simple methods: Ballpoint pen printing to generate the electrodes, and wrapping of a dielectric plastic film to coat the electrodes. For precise and programmable printing of the patterned electrodes, we used a digital plotter with a ballpoint pen filled with a silver nanoparticle (AgNP) ink. Instead of using conventional material deposition methods, such as chemical vapor deposition, printing, and spin coating, for fabricating the thin dielectric layer, we used a simple method in which we prepared a thin dielectric layer using pre-made linear, low-density polyethylene (LLDPE) plastic (17-m thick) by simple wrapping. We then sealed it tightly with thin silicone oil layers so that it could be used as a DMF chip. Such a treated dielectric layer showed good electrowetting performance for a sessile drop without contact angle hysteresis under an applied voltage of less than 170 V. By using this straightforward fabrication method, we quickly and affordably fabricated a paper-based DMF chip and demonstrated the digital electrofluidic actuation and manipulation of drops.