College of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, Shandong 273165, P. R. China.
School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, Heilongjiang 150090, P. R. China.
J Mater Chem B. 2021 Jul 28;9(29):5869-5876. doi: 10.1039/d1tb00989c.
A highly selective and sensitive photoelectrochemical (PEC) detection method has been developed for the analysis of copper (Cu2+) ions using nanoflower-like ZnO@CdS heterojunctions, of which ZnO was first in situ grown onto the indium tin oxide electrodes by a hydrothermal method and then coated with CdS through the chemical bath deposition route. It was discovered that the ZnO@CdS heterojunction so formed could serve as a photosensitive catalyst with improved charge separation for visible-light-driven PEC responses. Enhanced visible-light harvesting of nanocomposites could also be expected with CdS as the visible-light sensitizer. Furthermore, the introduction of Cu2+ ions could cause a rational decrease in the photocurrents of nanocomposites through the specific interaction between CdS and Cu2+ ions. A ZnO@CdS heterojunction-based PEC sensor was thereby developed for the detection of Cu2+ ions in blood in the linear concentrations ranging from 0.50 to 80 nM, with a limit of detection of 0.18 nM. Such a heterojunction-based PEC detection platform constructed using two photocatalytic materials with matched band structures are promising for a wide range of applications for sensing Cu2+ ions in clinical diagnostics, food monitoring, and environmental analysis.
一种高选择性和高灵敏度的光电化学（PEC）检测方法已经被开发出来，用于分析铜（Cu2+）离子，该方法使用了纳米花状 ZnO@CdS 异质结，其中 ZnO 首先通过水热法原位生长在铟锡氧化物电极上，然后通过化学浴沉积法覆盖 CdS。研究发现，所形成的 ZnO@CdS 异质结可以作为一种光敏催化剂，用于可见光驱动的 PEC 响应，提高电荷分离效率。预计 CdS 作为可见光敏化剂也可以增强纳米复合材料的可见光捕获能力。此外，Cu2+离子的引入可以通过 CdS 和 Cu2+离子之间的特异性相互作用，导致纳米复合材料的光电流合理下降。因此，基于 ZnO@CdS 异质结的 PEC 传感器被开发出来，用于检测血液中的 Cu2+离子，其线性浓度范围为 0.50 至 80 nM，检测限为 0.18 nM。这种使用两种具有匹配能带结构的光催化材料构建的基于异质结的 PEC 检测平台，有望在临床诊断、食品监测和环境分析等领域广泛应用于 Cu2+离子的传感。
