Investigation of Electrode Patterns Suitable for Nano-Litre Drop Coated Conducting Polymer Composite Sensors

This study presents an analysis of electrode patterns suitable for use with drop coated conducting polymer gas sensors. A thin-film technique was used to efficiently fabricate the copper electrode patterns (Arshack, 2005). Conducting polymer composite (CPC) materials were deposited using a 500 nano-litre syringe onto the electrode patterns to produce an array of sensors for organic solvent vapour detection. The sensors were exposed to propanol vapour in steps of 3000 ppm from a minimum concentration of 5000 ppm up to a maximum concentration of 20,000 ppm. Empirical results showed that a non-parallel electrode configuration produces a marginally larger response and is also less noisy than the interdigitated or parallel electrode configurations. Results show that increasing the baseline resistance of the sensing material gives a larger response