Porphyrin-based metal-organic framework thin films for electrochemical nitrite detection

Uniform zirconium-based porphyrin metal-organic framework (MOF-525) thin films are grown on conducting glass substrates by using a solvothermal approach. The obtained MOF-525 thin film is electrochemically addressable in aqueous solution and shows electrocatalytic activity for nitrite oxidation. The mechanism for the electrocatalytic oxidation of nitrite at the MOF-525 thin film is investigated by cyclic voltammetry. The redox mechanism of the MOF-525 thin film in the KCl aqueous solution is studied by amperometry. The MOF-525 thin film is deployed as an amperometric nitrite sensor. The linear range, sensitivity, and limit of detection are 20-800 mu M, 95 mu A/mM-cm(2), and 2.1 mu M, respectively. (C) 2015 Elsevier B.V. All rights reserved.