Dissolved oxygen sensor using platinum electrode coated with polydimethylsiloxane

An amperometric sensor for the determination of dissolved oxygen was prepared by dip-coating a platinum electrode from an aqueous dispersion of polydimethylsiloxane (PDMS). Oxygen molecules easily pass through the porous PDMS layer but the transport of hydrophilic species (e.g., hydrogen peroxide and Fe(CN)63-) through the hydrophobic polymer layer was strongly restricted, which results in the high selectivity of the present oxygen sensor.