Material Selection for Impedance Spectroscopy on an Eletrowetting Based Lab-on-a-Chip
Sprache des Vortragstitels:
21st Micromechanics and Micro systems Europe Workshop
Sprache des Tagungstitel:
In this paper we discuss the question if and under which conditions a lab-on-a-chip platform can be realized utilizing electrowetting on dielectrics as an actuation principle and impedance spectroscopy as a sensor principle. In order to examine the different isolation layers used for electro wetting, we measured the impedance function over a range from 40Hz to 110 MHz. As a result we found an impedance signal with characteristic properties measured through thin isolation layers with high capacitance. With increasing thickness and additional layers the impedance signal got dominated by the lower capacitance. Thus, materials with higher permittivity and hydrophobic layers consisting of self assembled monolayers are suggested.