A novel platinum-chitosan nano-composite (Pt-CS) was synthesized by electrochemical co-deposition at a glassy carbon electrode (GCE) for fabrication of a nitrite sensor, Pt-CS/GCE. The deposition formed a nanocomposite modified surface layer on the GCE, which was characterized by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and field emission scanning electron microscope (SEM). It was found that the Pt-CS nano-composite generated flower-like spherical particles with sizes of about 250 nm, which was consisted of Pt nanoparticles with sizes smaller than 10 nm, suggesting that the chitosan molecules were covered on the surface of Pt nanoparticles to form a core-shell structure. The electrocatalytic activity and sensing ability of the modified electrode was investigated by cyclic voltammetry (CV), differential pulse voltammetry (DPV) and differential pulse amperometry (DPA). It demonstrated that the electrode was excellent for catalytic determination of nitrite with good reproducibility, good stability and fast response. The detection limit was found to be 1.5×10-7M and the linear concentration range is 9.9×10-7 to 7.5×10-3 M.
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Zhu et al. (2013) studied this question.
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