MOF-Conductive polymer composite electrode as electrochemical sensor of nitrobenzene

A metal–organic framework (MOF)-conductive polymer composite film modified electrode was constructed by drop casting using PCN-222(Fe) and p3HT-p3TPA copolymer. The composite materials were characterized by diffraction, spectroscopic and electron microscopic techniques, showing the uniform distribution of MOF particles in the polymer matrix with the original MOF structure maintained. Introduction of carboxylate groups to the polymer matrix enhances interaction between polymer and MOF particles, leading to enhanced electron transfer and better water stability. The modified electrode was used for electrochemical detection of nitrobenzene in aqueous solution with the wide linear detection ranges of 0.05 μM-1.00 μM (0.6572 μAμM−1) and 1.00 μM-100 μM (0.03304 μAμM−1) as well as a low detection limit of 0.047 μM.