Abstract
In this paper, novel ε-MnO2 microspheres with uniform flaky texture were synthesized by a precursor conversion method. Basing on this material, a novel ε-MnO2 microspheres/chitosan/GCE (glassy carbon electrode) electrochemical sensor prepared by a simple physical deposit method was developed for the ultrasensitive determination of Ponceau 4R. The proposed electrochemical sensor exhibits remarkable electrocatalytic activity towards Ponceau 4R, suggesting a potentially detailed reaction mechanism catalyzed by ε-MnO2 and demonstrating a wide linear detection range from 0.005 to 1000μmoldm−3 and a low detection limit of 0.1 nmol dm−3 (S/N=3) for Ponceau 4R. The sensor also shows promising selectivity, stability and reproducibility and finally, is applied to determine Ponceau 4R in real samples, giving satisfactory results.
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