A seaweed-polyaniline nanofibre modified electrode for sensing of uric acid

摘要

In this paper, seaweed-polyaniline (SE-PANI) nanofibres were prepared through a polymerization of aniline hydrochloride in the presence of seaweed extract (SE) and ammonium persulphate (APS) used as an oxidant. The resultant SE-PANI nanofibres were characterized by different techniques such as Fourier transform infrared spectroscopy, ultra violet-visible spectroscopy, X-ray diffraction, high resolution scanning electron microscopy and Brunauer-Emmett-Teller analysis. The thermal stability of the SE-PANI nanofibres was higher than that of pristine PANI, confirmed by thermogravimetric analysis and differential thermal analysis. Electrochemical measurements of the SE-PANI nanofibres were carried out using cyclic voltammetry and electro-chemical impedance spectroscopy. A SE-PANI/GCE modified electrode shows a better electrocatalytic activity for uric acid (UA) with a lower potential and a larger peak current than the pristine PANI modified glassy carbon electrode. DPV studies revealed that the fabricated electrode had excellent sensitivity for uric acid with a lowest detection limit of 0.104 mu M over a wide concentration range of 5 x 10(-5) to 5 x 10(-3) M.