(AGENPARL) – LONDON (UNITED KINGDOM), mar 15 settembre 2020
A novel nanorod-like MoS2 semiconductor nanostructure was synthesized through a simple two-step method. Nanorod-like MoS2 nanostructure was exploited as electrode material to immobilized enzyme and electrochemical sensing application. Characterizations of nanorod-like MoS2 nanostructure and the resultant biosensor were performed by scanning electron microscope, Fourier transform infrared spectroscopy, electrochemical impedance spectrum, and cyclic voltammetry. Enzyme molecules loaded at MoS2 nanostructure retained their native structure and bioactivity. The direct electron transfer of glucose oxidase at MoS2 nanostructure coated glassy carbon electrode was enhanced greatly. At an optimal potential of -0.45 V, the electrochemical glucose sensor had wide linear ranges of 1.5×10-5-3.25×10-4 M and 3.25×10-4-1.43×10-3 M, and a low detection limit of 0.005 mM (S/N = 3) with a high sensitivity of 25.06 ± 0.5 mA M−1 cm−2. At the same time, the present biosensor showed excellent selectivity, reproducibility and stability for glucose. What’s more, the biosensor was successfully applied to determination of practical samples.
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