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. 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 a wide linear detection range of 0.05 μM–100 μM and a low detection limit of 0.047 μM. [Display omitted] • Composite films of metal–organic frameworks (MOFs) and conductive polymers was fabricated. • Conductive polymers with carboxylic acid functional groups increase MOF stability in aqueous solution as well as electron transfer rates due to their strong interaction with MOF particles. • The MOF-conductive polymer film could be used as electrochemical sensor for nitrobenzene with the detection limit as low as 0.05 µM. 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. [ABSTRACT FROM AUTHOR]