Floating Electrode Electrowetting on Hydrophobic Dielectric with an SiO2 Layer

摘要

Floating electrode electrowetting is caused by dc voltage applied to a liquiddroplet on the Cytop surface, without electrical connection to the substrate.The effect is caused by the charge separation in the floating electrode. Ahighly-resistive thermally-grown SiO2 layer underneath the Cytop enables thedroplet to hold charges without leakage, which is the key contribution.Electrowetting with an SiO2 layer shows a memory effect, where the wettingangle stays the same after the auxiliary electrode is removed from the dropletin both conventional and floating electrode electrowetting. Floating electrodeelectrowetting provides an alternative configuration for developing advancedelectrowetting-based devices.