Direct electrodeposition of gold nanoparticles on indium tin oxide surface and its application.

Gold nanoparticles (GNPs) were direct deposited onto the surface of indium tin oxide (ITO) electrode surface through cyclic voltammetric method. The GNPs-modified ITO electrodes were characterized by means of scanning electron microscopy (SEM), UV-vis spectroscopy and electrochemical methods. The quasi-spherical GNPs directly attached on the electrode surface with a relatively small size and a quite narrow distribution. Cyclic voltammetry and linear sweep voltammetry of glucose on the modified electrodes were performed. The GNPs-modified ITO electrodes showed high electrocatalytic reactivity towards glucose oxidation in 0.01 M NaOH and 0.05 M phosphate buffer solution (pH 7.4). The GNPs-modified transducer was successfully used for the amperometric sensing of glucose at alkaline and neutral solutions.