A Microfabricated Transparent Capacitor for Sensing Ethanol

The development of new sensing platforms could offer exciting opportunities for healthcare and environmental applications. In the last few decades, sensor device configurations have been limited owing to the use of electrochemical electrodes, resistors, and transistors. Capacitors are widely used for constructing various electronic devices. Here, we report for the first time the construction of a transparent interdigital transparent capacitor and its use for sensing ethanol. When the ethanol concentration changes, the dielectric properties of the capacitor change, resulting in the response of the impedance and capacitance. The capacitor shows a detection range of 0.1-1 volume fraction. It is expected that this paper could open up new opportunities for fundamental studies of more complex sensor configurations with a capacitor as one of the components and advance related healthcare and environmental applications.