Polypyrrole filament sensors for gases and vapours

Screen-printed electrodes have been used widely in bioprocesses and are inexpensive, easily mass-produced, reproducible and simple. Moreover, conducting polymers have been deposited across screen-printed carbon tracks to form sensors. Recently we reported on two novel methods for the electrochemical growth of conducting polymer filaments across screen-printed carbon track arrays and showed that a filament sensor was three times more sensitive to ethanol vapour than a broad sensor. In this paper, we report further progress in this avenue of research that includes not only ethanol as analyte but also ozone.