Superhydrophobic ZnO for EWOD Digital Microfluidic Device for Application in Micro Total Analysis System (mu-TAS)

作者：Zhou J^*; Yang S; Zeng X Y; Wu J H; Chen G P; Huang Y P

来源：Journal of Adhesion Science and Technology, 2012, 26(12-17): 2087-2098.

DOI：10.1163/156856111X600451

• Superhydrophobic surface
• nano-ZnO
• EWOD
• high K composite dielectric

In this paper, we present a nanostructured ZnO based superhydrophobic high dielectric constant ( K) composite dielectric for EWOD digital microfluidic device for application in mu-TAS. Two fabrication methods of nannosturctured ZnO superhydrophobic surface are studied. Through electrochemical deposition, a nanostructured ZnO film with a dielectric constant of 6.21 and a maximum contact angle of 158.9 degrees is achieved. To prevent electrical leakage, a high dielectric constant barrier is combined with hydrothermal synthesis of ZnO nanorods. The contact angle reaches 164.8 degrees on the composite surface with a contact angle hysteresis of 11.3 degrees. Enhancement of optical signal detected on the superhydrophobic layer is demonstrated. Using such superhydrophobic high K composite material in EWOD digital microfluidics for application in mu-TAS is proposed and has shown its potential feasibility.

• 出版日期2012
• 单位复旦大学