School of Physics and Physical Engineering, Shandong Provincial Key Laboratory of Laser Polarization and Information Technology, Qufu Normal University, Qufu, 273165, PR China; Department of Chemistry and Chemical Engineering, Jining University, Qufu City, Shandong Province, 273155, PR China.
School of Physics and Physical Engineering, Shandong Provincial Key Laboratory of Laser Polarization and Information Technology, Qufu Normal University, Qufu, 273165, PR China.
Anal Chim Acta. 2021 Apr 1;1152:338285. doi: 10.1016/j.aca.2021.338285. Epub 2021 Feb 4.
Silver-doped ZnO nanorods (Ag/ZnO) arrays have in-situ grown onto indium tin oxide (ITO) via the one-pot hydrothermal route towards a highly selective and recyclable electroanalysis of phosphothioate pesticides (PTs) with phoxim (Phox) as a model. It was discovered that the Ag/ZnO arrays-modified electrode could obtain a steady and sharp electrochemical output of solid-state Ag/AgCl at a low potential (i.e., 0.12 V). More importantly, the achieved Ag/AgCl signals could decrease selectively induced by sulfide (S)-containing Phox by the specific Cl-S displacement reaction, which would trigger AgCl into non-electroactive Ag-Phox complex. The Ag/ZnO arrays-modified sensors present a linear range from 0.050 to 700.0 μM for the detection of Phox, with a limit of detection down to 0.010 μM. The practical applicability of the developed electroanalysis strategy was successfully employed to detect Phox in the tap water and cabbage samples. Moreover, the photocatalytic performances of the Ag/ZnO arrays were subsequently verified for the degradation of Phox, displaying the higher photocatalytic efficiency than pure ZnO nanorods. Besides, the as-developed sensor can allow for the recyclable detection of Phox by the Ag/ZnO-photocatalyzed removal of Phox after each of the detection cycles. Therefore, the sensors platform based on Ag/ZnO arrays can be expected to have potential for the electrochemical monitoring and photocatalytic degradation of toxic pesticides in the food and environmental fields.
银掺杂氧化锌纳米棒（Ag/ZnO）阵列通过一锅水热法原位生长在铟锡氧化物（ITO）上，用于高选择性和可重复使用的对硫代磷酸酯农药（PTs）的电化学分析，以辛硫磷（Phox）为模型。研究发现，Ag/ZnO 阵列修饰电极可以在低电位（即 0.12 V）下获得固态 Ag/AgCl 的稳定而尖锐的电化学输出。更重要的是，实现的 Ag/AgCl 信号可以通过含有硫（S）的 Phox 的特异性 Cl-S 置换反应选择性地降低，这将触发 AgCl 转化为非电活性的 Ag-Phox 配合物。Ag/ZnO 阵列修饰的传感器对 Phox 的检测范围为 0.050 至 700.0 μM，检测限低至 0.010 μM。所开发的电化学生物传感器策略的实际适用性已成功用于自来水中和白菜样品中 Phox 的检测。此外，还随后验证了 Ag/ZnO 阵列的光催化性能用于 Phox 的降解，显示出比纯 ZnO 纳米棒更高的光催化效率。此外，通过 Ag/ZnO 光催化去除 Phox 后，开发的传感器可以实现 Phox 的可重复检测。因此，基于 Ag/ZnO 阵列的传感器平台有望在食品和环境领域中用于有毒农药的电化学监测和光催化降解。
