A novel fluoride-selective electrode based on metalloporphyrin grafted-grapheneoxide

In this work, the unique properties of graphene oxide were combined with the anion selectivity of metalloporphyrin to fabricate a novel fluoride-selective sensor. The electrode made of 27% PVC, 54% NPOE, 4% NaTPB and 15% NbTPPGO was found to show the most favorable behavior. The sensor shows a Nernstian response (58.3 mV decade−1) in the concentration window of 5.0×10−1–5.0×10−7 mol L−1with detection limit of 8.0×10−87 mol L−1. The response of the sensor was found to be stable in the pH range of 3.0–7.0 and the metalloporphyrin grafted-GO based F− sensors displayed very good selectivity with respect to a number of anions. The proposed sensor displays a long life time (more than 12 weeks) with a short response time of about 20 s.