An All-solid-state Cd2+-selective electrode with a low detection limit

A new all-solid-state Cd2+-selective electrode with a low detection limit was prepared by using conjugated thiophene oligomer α-sexithiophene (α-6T) as solid contact deposited between an ionophore-doped poly(vinyl chloride) membrane and a gold disc substrate. The electrode exhibited a Nernstian response for Cd2+ ions over a wide concentration range of 10−3–10−7 M with a detection limit as low as 1.3 × 10−8 M. Results showed that the fabricated potentiometric sensor was suitable for use within the pH range of 2.0–9.0 and exhibited good reproducibility for long-term measurements.