A label-free and sensitive electrochemiluminescence sensor based on a simple one-step electrodeposition of Go/ZnS modified electrode for trace copper ions detection

Publication date: June 2020Source: Microchemical Journal, Volume 155Author(s): Yousheng Ye, Lingyi Wang, Kunming Liu, Jianguo LiAbstractHerein, we described an electrochemiluminescence (ECL) strategy for trace amounts of Cu2+ determination based on a simple one-step electrodeposition of graphene oxide supported ZnS nanocrystals modified electrode (GO/ZnS/GC). The quantitatively detection of Cu2+ in the samples is developed on the quenching effect of Cu2+ on GO/ZnS. Moreover, the deposited GO/ZnS is an environmental friendly material with excellent ECL performance. The morphologies and chemical compositions of GO/ZnS/GC have been characterized by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). The experimental results showed that, under the optimized experimental conditions, Cu2+ in water has a good ECL response with a low detection limit (2.2 × 10−11mol/L). The logarithm value of different concentrations of Cu2+ in the range of 1 × 10−10~1 × 10−7 mol/L has a good linear relationship with the value of ΔECL (R2 = 0.9960), and the linear equation is ΔI = 753.01 lg c + 9293.2. The interference of the modified electrode to the heavy metal ions in the water is within the allowable error range, and the RSD and the recovery of the samples are 1.5%~2.2% and 96%~105%. As a result, the proposed method is suitable for detecting trace copper ion in water.
Source: Microchemical Journal - Category: Chemistry Source Type: research