Rapid and highly sensitive MnOx nanorods array platform for a glucose analysis

A Mn 2 O 3 nanorod array has been successfully prepared by using simple pulse-reverse electrodeposition that was then followed by transformation to a higher MnO x oxidation state via electrochemical oxidation . The surface morphology and composition of the MnO x nanorods was verified via scanning electron microscopy and X-ray photoelectron spectroscopy. The MnO x nanorod array exhibits excellent electrocatalytic activity toward glucose oxidation under alkaline conditions and these properties were confirmed by using cyclic voltammetry , electrochemical impedance spectroscopy and chronoamperometry . The structure of the MnO x nanorod array not only provides a large surface area , but also facilitates electron transfer and mass diffusion. The optimum oxidation time was determined to be 30 min, at which the MnO x glucose sensor demonstrated a sensitivity at 811.8 μA mM −1 , which is the highest among the various types of MnO x -based sensors that have been reported so far. Moreover, it also exhibited an excellent long-term stability and a good selectivity in the presence of interferents , such as ascorbic acid , dopamine, uric acid , urea, and aspartic acid . The practical applicability of MnO x sensor was also studied by detecting glucose in human serum, in which it demonstrated an excellent selectivity and reliability.