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Abstract: A novel sensor for detection of trace gallium ion [Ga(III)] was created by stepwise modification of a gold electrode with β-cyclodextrin (β-CD)/multi-walled carbon nanotubes (MWCNTs) and an ion imprinted polymer (IIP). The sensor surface morphology was characterized by scanning electron microscopy. The electrochemical performance of the imprinted sensor was investigated by cyclic voltammetry, differential pulse voltammetry and chronoamperometry. The sensor displayed excellent selectivity towards the target Ga(III) ion. Meanwhile, the introduced MWCNTs displayed noticeable catalytic activity, and β-CD demonstrated significant enrichment capacity. A linear calibration curve was obtained covering the concentration range from 5.0 x 10-8 to 1.0 x 10-4 mol L-1, with a detection limit of 7.6 x 10-9 mol L-1. The proposed sensor was successfully applied to detect Ga(III) in real urine samples
Template and target information: gallium ion, Ga(III)
Author keywords: Ion imprinted, Electrochemical sensor, Multi-walled carbon nanotubes, β-cyclodextrin, Ga(III)-8-hydroxyquinoline complex