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A novel all-solid-state Zn2+-selective electrode with a low detection limit was prepared using poly (3-octylthiophene) (POT) as ion-to-electron transducer. The electrode exhibits a Nernstian response for Zn2+ions over a wide concentration range from 10-3to 10-9M with a low detection limit of 1.0×10-9M. Results also showed that the fabricated potentiometric sensors are suitable for the pH range of 3.0 ~7.1 with good stability in harsh conditions.