Nickel oxide microfibers immobilized onto electrode by electrospinning and calcination for nonenzymatic glucose sensor and effect of calcination temperature on the performance

Nickel oxide microfibers (NiO-MFs) were directly immobilized onto the surface of fluorine tin oxide (FTO) electrode by electrospinning and calcination without using any immobilization matrix for nonenzymatic glucose sensor. Morphology and structure of NiO-MEs were characterized by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), and X-ray diffraction pattern (XRD). The electrochemical and electrocatalytic performances of the NiO-MEs modified electrodes prepared at different calcination temperatures ranging from 300 to 500 degrees C were evaluated by cyclic voltammetry (CV). The CV results have demonstrated that NiO-MEs modified electrode prepared at 300 degrees C displayed distinct increase in electrocatalytic activity toward the oxidation of glucose, which is explored to develop an amperometric nonenzymatic glucose sensor. The NiO-MEs prepared at 300 degrees C based amperometric nonenzymatic glucose sensor has ultrasensitive current (1785.41 mu A mM(-1) cm(-2)) response and low detection limit of 3.3 x 10(-8) M (signal/noise ratio (S/N) = 3), which are among the best values reported in literature. Additionally, excellent selectivity and stability have also been obtained. (c) 2010 Elsevier B.V. All rights reserved.