In this manuscript, a layer of 2-methylimidazole zinc salt (ZIF-8) membrane is deposited on the surface of glassy carbon electrode (GCE) modified with platinum nanoparticles (Pt NPs) by reduction electrochemical method to obtain ZIF-8/Pt NPs/GCE, and then used for the detection of ascorbic acid (AA). The deposition of Pt NPs on the surface of GCE can not only guide the nucleation and growth of ZIF-8 membrane, but also exert a synergistic effect with it to enhance conductivity. For ZIF-8 membrane, it can increase the active area of electrode and thus improve the electrochemical response of the sensor for AA. Influence factors such as the deposition current density, deposition time on the surface morphology of the modified electrode, and the detection performance of the modified electrode during the electrochemical deposition of ZIF-8 membrane were explored to get the best performance. In addition, influence of conditions such as sweep speed and pH of the test solution on the electrochemical response signal of AA were also studied. Under the best conditions, the linear range of AA detection by this sensor is from 10 μmol L⁻¹ to 2500 μmol L⁻¹, and the detection limit is 5.2 μmol L⁻¹ based on S/N = 3. What's more, the modified electrode also has good anti-interference ability, reproducibility and stability, and has achieved satisfactory results in the detection for AA in real samples.

在此手稿中，通过还原电化学法在铂纳米颗粒（Pt NPs）修饰的玻璃碳电极（GCE）的表面上沉积一层2-甲基咪唑锌盐（ZIF-8）膜，从而获得ZIF-8 / Pt NPs / GCE，然后用于检测抗坏血酸（AA）。Pt NPs在GCE表面的沉积不仅可以指导ZIF-8膜的成核和生长，还可以起到协同作用，从而提高电导率。对于ZIF-8膜，它可以增加电极的活性面积，从而改善AA传感器的电化学响应。影响因素，例如沉积电流密度，沉积时间对改性电极的表面形态，并探索了在ZIF-8膜电化学沉积过程中修饰电极的检测性能，以获得最佳性能。另外，还研究了诸如扫描速度和测试溶液的pH之类的条件对AA的电化学响应信号的影响。在最佳条件下，此传感器检测AA的线性范围为10μmolL^-1至2500μmolL ^-1，基于S / N = 3的检出限为5.2μmolL ^-1。此外，改性电极还具有良好的抗干扰能力，重现性和稳定性，并取得了令人满意的结果检测真实样品中的AA。