期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 199, 期 -, 页码 183-189出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2014.03.112
关键词
Cyanoethyl pullulan (CEP); Insulator; Dielectric; Electrowetting; EWOD
资金
- National Science Foundation of China [61176110]
In this paper, the dielectric and electrowetting properties of cyanoethyl pullulan (CEP) are studied as the insulator in electrowetting on dielectric (EWOD) device. The CEP film is formed by spin-coating and low-temperature annealing in atmosphere. The characterization results show that CEP can serve as the dielectric of EWOD with a high dielectric constant of 18 and a great electrowetting performance when annealed at 100 degrees C in atmosphere. The reversibility, stability, polarity-dependence, and frequency-dependence of electrowetting on CEP are fully investigated. The spin-coated CEP exhibits little polarity-related electrowetting while having better driving performance under negative-potential. Frequency-related electrowetting is more sensitive at low-frequency alternating current (AC) potentials than at high-frequency ones. It also shows reversible and stable electrowetting with a small irreversibility of 2 degrees after a 700-cycle test. Based on the above results, an EWOD device with 1 mu m thick CEP dielectric layer is fabricated. The EWOD device successfully manipulates water droplet at a low driving voltage of 20V and a large velocity under low voltage of DC or AC signals with different frequencies. The easy fabrication and excellent performance of CEP qualifies it as a superior dielectric material in the future EWOD devices and lab-on-a-chip system. (C) 2014 Elsevier B.V. All rights reserved.
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