Department of Chemical Engineering and Biotechnology, National Taipei University of Technology, No. 1, Chung-Hsiao East Road, Section 3, Taipei 10608, Taiwan, Republic of China.
Sensors Lab, Advanced Membranes and Porous Materials Center, Computer, Electrical and Mathematical Science and Engineering Division, King Abdullah University of Science and Technology (KAUST), Thuwal 23955, Saudi Arabia.
ACS Appl Mater Interfaces. 2021 Jun 2;13(21):24865-24876. doi: 10.1021/acsami.1c04597. Epub 2021 May 19.
As the use of pesticides in agriculture is increasing at an alarming rate, food contamination by pesticide residues is becoming a huge global problem. It is essential to develop a sensitive and user-friendly sensor device to quantify trace levels of pesticide and herbicide residues in food samples. Herein, we report an electrocatalyst made up of yttrium iron garnet (YFeO; YIG) and graphitic carbon nitride (GCN) to attain picomolar-level detection sensitivity for mesotrione (MTO), which is a widely used herbicide in agriculture. First, YIG was prepared by a hydrothermal route; then, it was loaded on GCN sheets via a calcination method. The surface structures, composition, crystallinity, and interfacial and electrocatalytic properties of the YIG and YIG/GCN were analyzed. As the YIG/GCN displayed better surface and catalytic properties than YIG, YIG/GCN was modified on a screen-printed carbon electrode to fabricate a sensor for MTO. The YIG/GCN-modified electrode displayed a detection limit of 950 pM for MTO. The method was demonstrated in (spiked) fruits and vegetables. Then, the modified electrode was integrated with a miniaturized potentiostat called KAUSTat, which can be operated wirelessly by a smartphone. A first smartphone-based portable sensor was demonstrated for MTO that is suitable for use in nonlaboratory settings.
随着农业中农药使用量的惊人增长，食物受到农药残留的污染已成为一个全球性的大问题。开发一种灵敏且易于使用的传感器设备来定量检测食物样本中痕量水平的农药和除草剂残留至关重要。在此，我们报告了一种由钇铁石榴石 (YFeO; YIG) 和石墨相氮化碳 (GCN) 组成的电催化剂，以实现对农业中广泛使用的除草剂麦草畏 (MTO) 的皮摩尔级检测灵敏度。首先，通过水热法制备 YIG；然后，通过煅烧法将其负载在 GCN 片上。分析了 YIG 和 YIG/GCN 的表面结构、组成、结晶度以及界面和电催化性能。由于 YIG/GCN 显示出比 YIG 更好的表面和催化性能，因此在制备用于 MTO 的传感器时，将 YIG/GCN 修饰在丝网印刷碳电极上。YIG/GCN 修饰电极对 MTO 的检测限为 950 pM。该方法已在（加标）水果和蔬菜中得到验证。然后，将修饰后的电极与称为 KAUSTat 的小型化电位计集成在一起，该电位计可以通过智能手机进行无线操作。演示了一种基于智能手机的用于 MTO 的便携式传感器，该传感器适用于非实验室环境。
