Institute of Organic and Polymeric Materials, National Taipei University of Technology, No. 1, Section 3, Zhongxiao East Road, Taipei 106, Taiwan.
Department of Electrical Engineering, National Taipei University of Technology, No. 1, Section 3, Zhongxiao East Road, Taipei 106, Taiwan.
Sensors (Basel). 2022 Jul 5;22(13):5049. doi: 10.3390/s22135049.
The sensitive detection and degradation of synthetic dyes are pivotal to maintain safety owing to the adverse side effects they impart on living beings. In this work, we developed a sensitive electrochemical sensor for the nanomolar-level detection of rhodamine B (RhB) using a dual-functional, silver-decorated zinc oxide (Ag/ZnO) composite-modified, screen-printed carbon electrode. The plasmon-enhanced photocatalytic degradation of organic pollutant RhB was also performed using this nanocomposite prepared by embedding different weight percentages (1, 3, and 5 wt%) of Ag nanoparticles on the surface of a three-dimensional (3D), hierarchical ZnO nanostructure based on the photoreduction approach. The structure and morphology of an Ag/ZnO nanocomposite were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), elemental mapping, ultraviolet-visible (UV-vis) spectroscopy, and X-ray diffraction (XRD). The electrochemical sensor exhibited a very high sensitivity of 151.44 µAµMcm and low detection limit of 0.8 nM towards RhB detection. The selectivity, stability, repeatability, reproducibility, and practical feasibility were also analyzed to prove their reliability. Furthermore, the photocatalysis results revealed that 3 wt% of the Ag/ZnO hybrid nanostructure acquired immense photostability, reusability, and 90.5% degradation efficiency under visible light. Additionally, the pseudo-first-order rate constant of Ag-3/ZnO is 2.186 min suggested promising activity in visible light photocatalysis.
由于合成染料对生物体具有不利的副作用，因此对其进行灵敏检测和降解对于维护安全至关重要。在这项工作中，我们使用双功能、银修饰的氧化锌（Ag/ZnO）复合修饰的丝网印刷碳电极，开发了一种用于纳米级检测罗丹明 B（RhB）的灵敏电化学传感器。还通过在基于光还原方法的三维（3D）、分级 ZnO 纳米结构表面嵌入不同重量百分比（1、3 和 5 wt%）的 Ag 纳米粒子来制备纳米复合材料，进行了有机污染物 RhB 的等离子体增强光催化降解。Ag/ZnO 纳米复合材料的结构和形态通过扫描电子显微镜（SEM）、透射电子显微镜（TEM）、元素映射、紫外-可见（UV-vis）光谱和 X 射线衍射（XRD）进行了表征。电化学传感器对 RhB 检测表现出非常高的灵敏度（151.44 µAµMcm）和低检测限（0.8 nM）。还分析了选择性、稳定性、重复性、重现性和实际可行性，以证明其可靠性。此外，光催化结果表明，3 wt%的 Ag/ZnO 杂化纳米结构在可见光下具有巨大的光稳定性、可重复使用性和 90.5%的降解效率。此外，Ag-3/ZnO 的拟一级速率常数为 2.186 min，表明其在可见光光催化中具有良好的活性。
