Abstract
The electrochemical sensor has high promise for applications in the next-generation real-time monitoring devices and technologies. However, the related further development has been hindered by some intractable problems of the electrochemical sensors. In this work, we develop the nanocomposite of TiO2/Au nanofibers (NFs) with O-C3N4 nanosheets (NSs) by a solvothermal approach for the electrochemical detection of nitrofurazone (NFZ), an antimicrobial drug. The physicochemical characteristics of TiO2/Au-NFs/O-C3N4 nanocomposite is fully analyzed by diverse electron microscopic, spectroscopic and electroanalytical techniques. It is noted that the electrochemical response of TiO2/Au-NFs/O-C3N4 modified electrode is dramatically higher than unmodified and other modified electrodes. The TiO2/Au-NFs/O-C3N4 nanocomposite-based electrochemical sensor owns the superior performance for the NFZ detection, such as a wide working range of 0.008–105 μM, a limit of detection of 0.001 μM and high sensitivity of 1.40 µA µM−1 cm−2. Besides, it displays attractive features in terms of high selectivity, good steady-state stability (90 %), high cycle stability (94.8 %), fine repeatability (2.16 %) and reproducibility (1.34 %). The fabricated electrochemical sensor is also investigated to monitor the quantity of NFZ level in the real samples with the satisfactory results.
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