A metal-organic frameworks@ carbon nanotubes based electrochemical sensor for highly sensitive and selective determination of ascorbic acid

A conductive electrochemical sensor for ascorbic acid was prepared by in-situ growing metal-organic frameworks (ZIF-65) on the surface of carboxylated carbon nanotubes. This nanohybrid was dropped onto glassy carbon electrodes to fabricate a modified [email protected] CNTs electrode. Owing to the introduction of carboxylated carbon nanotubes, the conductivity of the sensor was enhanced with resistance decreased by half. Due to the porous crystal structures, good water-stability and oxidizing nitro groups of ZIF-65, this sensor exhibited high sensory performances to ascorbic acid with the detection limit of 1.03 μM. Excellent selectivity, anti-interference and reproducibility enabled it as a promising candidate in biomolecular sensing applications.