Capacitive solvent sensing with interdigitated microelectrodes

摘要: We were able to quantify dielectric properties of solvents such as DI water, isopropyl alcohol, and acetone using interdigitated microelectrodes (IMEs). IMEs fabricated conventional micro fabrication techniques. The dipped into the solution, property medium was measured. A range frequencies excitation voltages swept in order determine operation region that yields highest signal noise ratio. Measurements performed at 1 MHz 100 mV which resulted best applied a simple analytical model for calculation capacitance measured value parallel capacitor resistor perfect agreement with theoretical results. presented sensor provides accurate method solvent type may have possible future applications.