High electro-catalytic activities of glucose oxidase embedded one-dimensional ZnO nanostructures

One-dimensional ZnO nanorods and nanowires are separately synthesized on Zn substrate by simple hydrothermal processes at low temperatures. Electro-catalytic responses of glucose oxidase/ZnO/Zn electrodes using these two synthesized nanostructures of ZnO are reported and compared with others available in literature. It is apparent the Michaelis-Menten constant, K-M(app), for the present ZnO nanowire, having a greater aspect ratio, is found to be the lowest when compared with others. This sensor shows lower oxidation peak potential with a long detection range of 6.6 mu M-380 mM and the highest sensitivity of similar to 35.1 mu A cm(-2) mM(-1), among the reported values in the literature. Enzyme catalytic efficiency and turnover numbers are also found to be remarkably high.