| 總結: | In this work, a new hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) electrochemical sensor was fabricated. Prussian blue (PB) was electrodeposited on a glassy carbon (GC) electrode modified with zirconia doped functionalized carbon nanotubes (ZrO<sub>2</sub>-fCNTs), (PB/ZrO<sub>2</sub>-fCNTs/GC). The morphology and structure of the nanostructured system were characterized by scanning and transmission electron microscopy (TEM), atomic force microscopy (AFM), specific surface area, X-ray diffraction (XRD), thermogravimetric analysis (TGA), Raman and Fourier transform infrared (FTIR) spectroscopy. The electrochemical properties were studied by cyclic voltammetry (CV) and chronoamperometry (CA). Zirconia nanocrystallites (6.6 ± 1.8 nm) with cubic crystal structure were directly synthesized on the fCNTs walls, obtaining a well dispersed distribution with a high surface area. The experimental results indicate that the ZrO<sub>2</sub>-fCNTs nanostructured system exhibits good electrochemical properties and could be tunable by enhancing the modification conditions and method of synthesis. The fabricated sensor could be used to efficiently detect H<sub>2</sub>O<sub>2</sub>, presenting a good linear relationship between the H<sub>2</sub>O<sub>2</sub> concentration and the peak current, with quantification limit (LQ) of the 10.91 μmol·L<sup>−1</sup> and detection limit (LD) of 3.5913 μmol·L<sup>−1</sup>.
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