Abstract
The excellent dielectric and electrowetting properties of Cyanoethyl Pullulan (CEP) material were evaluated in this paper. The CEP can obtained a dielectric constant of 18 (100 kHz) by spin-coating and annealing at 100°C in atmosphere. The asymmetry, reversibility and stability of electrowetting on CEP were studied, showing negative-potential sensitive and good electrowetting performance. Based on these results, an EWOD device with 1μm thick CEP dielectric layer has been fabricated and tested, demonstrating the successful manipulation of water droplets with drive voltage of 20 V. The easy fabrication and excellent performance of CEP make it a superior dielectric material in the future EWOD devices.
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