Abstract
This work presents a study on how threshold voltage (VT) varies with the change in shapes (rectangular and interdigitated finger) and size of the coplanar electrode in electrowetting-on-dielectric (EWOD) device. The EWOD device is fabricated on glass substrate with aluminimum (Al) electrode. Next, synthesized nanocomposite thin film of BST/Teflon® AF is coated on the coplanar electrodes to act as both dielectric and hydrophobic layer. Experiments show that change in electrode dimension (or shape), such as electrode length (L), gap (G) and no. of teeth (T) result in different contact line (CL) between the droplet and the actuated electrode. This leads to change in VT for droplet transport. It is found that higher contact line results in lower threshold voltage, while lower contact line results in higher threshold voltage. This finding matches with the reported theory in literature.
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