In this study, we report on the selective of fructose on Co3O4 thin film electrode surface. A facile chemical solution deposition technique was used to fabricate Co3O4 thin film on fluorine doped tin oxide, FTO, glass. Electrode characterization was done using XRD, HRTEM, SEM, AFM, and EIS. The constructed sensor exhibited two distinctive linear ranges (0.021–1.74 mM; 1.74–∼15 mM) covering a wide linear range of up to ∼15 mM at an applied potential of +0.6 V vs Ag/AgCl in 0.1 M NaOH solution. The sensor demonstrated high, reproducible and repeatable (R.S.D of <5 %) sensitivity of 495 (lower concentration range) & 53 (higher concentration range) μA cm−2 mM−1. The sensor produced a low detection limit of ∼1.7 μM (S/N=3). The electrode was characterised by a fast response time of <6 s and long term stability. The repeatability and stability of the electrode resulted from the chemical stability of Co3O4 thin film. The sensor was highly selective towards fructose compared to the presence of other key interferences i. e. AA, AC, UA. The ease of the electrode fabrication coupled with good electrochemical activity makes Co3O4 thin film, a promising candidate for non-enzymatic fructose detection.

中文翻译：

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基于 Co3 O4 薄膜的非酶促果糖传感器

在这项研究中，我们报告了果糖对 Co3O4 薄膜电极表面的选择性。使用简便的化学溶液沉积技术在掺氟氧化锡、FTO、玻璃上制造 Co3O4 薄膜。使用 XRD、HRTEM、SEM、AFM 和 EIS 进行电极表征。构建的传感器表现出两个不同的线性范围（0.021-1.74 mM；1.74-~15 mM），在 0.1 M NaOH 溶液中，在 +0.6 V vs Ag/AgCl 的施加电位下覆盖了高达~15 mM 的宽线性范围。该传感器显示出 495（较低浓度范围）和 53（较高浓度范围）μA cm-2 mM-1 的高、可重现和可重复（RSD <5 %）灵敏度。该传感器产生的检测下限约为 1.7 μM（S/N=3）。该电极的特点是<6 s 的快速响应时间和长期稳定性。Co3O4 薄膜的化学稳定性决定了电极的重复性和稳定性。与其他关键干扰物 i 的存在相比，该传感器对果糖具有高度选择性。e. AA、AC、UA。电极制造的简易性加上良好的电化学活性使 Co3O4 薄膜成为非酶促果糖检测的有希望的候选者。