Facile Low-voltage Electrowetting on Dielectrics Using CYTOPTM as The Hydrophobic and Insulating Layer
文献类型：会议论文
| 作者 | Lijun Li; Jiahao Wu; Lin Luan; Tianzhun W |
| 出版日期 | 2015 |
| 会议名称 | 中国微米纳米技术学会第17次年会 CSMNT 2015 |
| 会议地点 | Shanghai， China |
| 英文摘要 | Electrowetting-on-dielectric (EWOD) technology, which manipulates droplets using electrical potentials, has been popular for microfluidics in recent years for many applications such as tunable microlens, bio-analysis, and electronic displays. The relationship between the droplet contact angle (CA) before and after the applied voltage can be described by the Young-Lippmann equation (1). According to the equation, a small insulating layer thickness or a large dielectric constant is preferred at a given applied voltage. However, a typical EWOD configuration uses both an insulating layer and a hydrophobic layer, which enlarges the thickness and yields relatively high threshold voltages, and increases the fabrication complexity. D. Caputo et al. reported that a single PDMS layer (~5 m thick) acted as both the insulating and hydrophobic material[1], yet the voltages was as high as 200 V, and PDMS is well known for its swelling and non-specific absorption. Here we propose thin CYTOPTM coating as the insulating and hydrophobic layer, and demonstrated its low-voltage actuation and automatic control based on a singlechip. CYTOPTM is an excellent amorphous fluoropolymer commercially available (from Asahi Co., Japan) and compatible with microfabrication. First, water CA on CYTOPTM is ~110°,which is one of the most hydrophobic materials and its hydrophobicity can be easily recovered after heating over the glass transition temperature (Tg=108°C), which is very attractive for practical application; Second, it can be conformally spin coated and has few pin hole even for thin thickness, and its breakdown voltage is up to 90 KV/mm; Third, it has excellent chemically inertness and resistance, which ensures reliability and reproducibility. These excellent characteristics endows CYTOPTM as the promising coating for EWOD applications. In our EWOD configuration (Fig.1a), 600 nm-thick CYTOPTM was spin coated and used (Fig.1b) on the array of 200 nm-thick ITO electrodes on the glass substrate (Fig.2a). The array is composed by a line of 12 square-shaped electrodes of 1*1mm area spaced by 20 m gaps (Fig.2b). We have tested the pure water CA of CYTOPTM using the classical single-plate configuration for more than 20 times, which is shown in Fig.2c. Water CA decreased to ~84° when applying 60 DCV and returned to ~110° when power was off, showing excellent reproducibility.. As a demonstration, we used a singlechip with a control circuit (Fig.3) to successfully realize the typical droplet operations (transporting, mixing and splitting) with DC 60V (Fig.4), which is significantly lower than previous report using PDMS[1].Hence, this simplified design using CYTOPTM may have the potential for practical EWOD applications in disease diagnosis, biological detection and monitoring of environmental pollutants. |
| 收录类别 | 其他 |
| 语种 | 英语 |
| 源URL | [http://ir.siat.ac.cn:8080/handle/172644/7268]  |
| 专题 | 深圳先进技术研究院_医工所 |
| 作者单位 | 2015 |
| 推荐引用方式 GB/T 7714 | Lijun Li,Jiahao Wu,Lin Luan,et al. Facile Low-voltage Electrowetting on Dielectrics Using CYTOPTM as The Hydrophobic and Insulating Layer[C]. 见:中国微米纳米技术学会第17次年会 CSMNT 2015. Shanghai， China. |
入库方式： OAI收割
来源：深圳先进技术研究院
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