Abstract
This work demonstrated the property enhancement of Pt nanodendrite (PtNDs)-decorated ZnO nanorods (ZnONRs) modified indium tin oxide (ITO) electrode for an enzymatic electrochemical glucose sensor. PtNDs with an average size of ~ 40 nm was synthesized via the chemical reduction method. The morphologies of the grown ZnONRs and decorated PtNDs/ZnONRs were observed by using a field-emission scanning electron microscope, whereas the presence of phases in the samples was studied by using an X-ray diffractometer. The electrochemical properties of the modified electrode were analyzed through cyclic voltammetry and amperometry, which showed that the presence of PtNDs contributed to a significant enhancement in the electron transfer rate during glucose redox reactions. The sensitivity obtained for the Nafion/GOx/PtNDs/ZnONRs/ITO electrode was 98.34 μA/mM cm2, which was higher than that obtained for the Nafion/GOx/ZnONRs/ITO electrode (15.71 μA/mM cm2). Moreover, the Nafion/GOx/PtNDs/ZnONRs/ITO electrode exhibited a low detection limit of 0.03 mM. The modified electrode had long-term stability and high selectivity against typical interfering species, such as uric acid and ascorbic acid. The reliability of the modified working electrode was studied by analyzing its performance in real human blood samples. The results showed the promising application of Nafion/GOx/PtNDs/ZnONRs/ITO as modified electrodes for electrochemical glucose sensors.
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