A sensitive electrochemical sensor for the determination of arsenic(III) based on a titanium dioxide (TiO₂) nanoparticle modified gold strip electrode (GSE) was developed. The gold strip electrode was prepared by a seeded growth method using polyethylene terephthalate (PET) films as the template. This GSE can provide an excellent electrochemical performance comparable to commercial gold disk electrodes, and possessed better flexibility and size controllability, as well as a larger effective surface area. A disposable thin-film electrochemical sensor was fabricated by a chemical modification method based on the gold strip electrode coating with TiO₂ nanoparticles. The resulting sensor showed a sensitive electrochemical response toward the oxidation of As(III) in hydrochloric acid (HCl) medium. Under optimized working conditions, the oxidation peak current of As(III) obtained by linear sweep voltammetry (LSV) linearly increased with its concentration in the range of 10–80 μg L⁻¹. The arsenic sensor also showed good stability and reproducibility, and was successfully applied to the detection of As(III) in blood samples.

中文翻译：

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基于二氧化钛纳米粒子修饰的金带电极的砷电化学传感器的制备与应用研究

开发了一种基于二氧化钛（TiO ₂）纳米粒子修饰的金带电极（GSE）的测定砷（III）的灵敏电化学传感器。通过使用聚对苯二甲酸乙二醇酯（PET）膜作为模板的种子生长法制备金带状电极。该GSE可以提供与市售金盘电极相当的出色电化学性能，并具有更好的柔韧性和尺寸可控性以及更大的有效表面积。通过化学修饰的方法，在以TiO ₂纳米颗粒包覆的金带电极上，通过化学修饰的方法制备了一次性薄膜电化学传感器。所得传感器显示出对As（）氧化的敏感电化学响应III）在盐酸（HCl）介质中。在最佳工作条件下，通过线性扫描伏安法（LSV）获得的As（III）的氧化峰值电流在其浓度范围为10–80μgL ^-1时呈线性增加。该砷传感器还显示出良好的稳定性和可重复性，并已成功地应用于血液样品中As（III）的检测。