title: Graphene quantum dots enhanced electrochemiluminescence of cadmium sulfide nanocrystals for ultrasensitive determination of pentachlorophenol.
abstract: An ultrasensitive electrochemiluminescence (ECL) sensor based on the ECL amplifying behavior of the graphene quantum dots-CdS nanocrystals (GQDs-CdS NCs) was constructed for the detection of pentachlorophenol (PCP). Because of the presence of doped GQDs, the resulting GQDs-CdS NCs exhibited 5-fold enhanced ECL intensity than pure CdS NCs with the ECL onset potential positively shifted by 80 mV. Furthermore, based on the effective inhibition of the ECL response of GQDs-CdS NCs film by PCP, a simple method for ultrasensitive determination of PCP was devised, which showed a wide linear range of 0.01-500 ng mL(-1) and a low detection limit of 3 pg mL(-1) (S/N = 3) with good stability, reproducibility and applicability for PCP detection in real water samples. Thus, it can be expected that GQDs-based composites with excellent performance may play a more important role in pesticide determination.
authors.affiliation: School of Food and Biological Engineering, Jiangsu University, Zhenjiang, 212013, P.R. China. Jrcai@ujs.edu.cn.
authors.forename: Qian
authors.initials: Q
authors.lastname: Liu
authors.forename: Kun
authors.initials: K
authors.lastname: Wang
authors.forename: Juan
authors.initials: J
authors.lastname: Huan
authors.forename: Gangbing
authors.initials: G
authors.lastname: Zhu
authors.forename: Jing
authors.initials: J
authors.lastname: Qian
authors.forename: Hanping
authors.initials: H
authors.lastname: Mao
authors.forename: Jianrong
authors.initials: J
authors.lastname: Cai
mesh_terms: D019187:Cadmium Compounds / Q000737:chemistry*; D004566:Electrodes; D006108:Graphite / Q000737:chemistry*; D057230:Limit of Detection; D049449:Luminescence; D046529:Microscopy, Electron, Transmission; D053758:Nanoparticles; D010416:Pentachlorophenol / Q000032:analysis*; D045663:Quantum Dots; D013440:Sulfides / Q000737:chemistry*
chemical_list: D019187:Cadmium Compounds; D013440:Sulfides; C034939:cadmium sulfide; D006108:Graphite; D010416:Pentachlorophenol