期刊
ACS APPLIED MATERIALS & INTERFACES
卷 6, 期 3, 页码 1646-1651出版社
AMER CHEMICAL SOC
DOI: 10.1021/am404552s
关键词
graphene quantum dots; L-cysteine; coreactant; electrochemiluminescence; lead(II)
资金
- National Natural Science Foundation of China [21075018, 21305017]
- Program for New Century Excellent Talents in Chinese University [NCET-10-0019]
- National Basic Research Program of China [2010CB732400]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT1116]
A new coreactant electrochemiluminescence (ECL) system including single-layer graphene quantum dots (GQDs) and L-cysteine (L-Cys) was found to be able to produce strong cathodic ECL signal. The ECL signal of GQD/L-Cys coreactant system was revealed to be mainly dependent on some key factors, including the oxidation of L-Cys, the presence of dissolved oxygen and the reduction of GQDs. Then, a possible ECL mechanism was proposed for the coreactant ECL system. Furthermore, the ECL signal of the GQD/L-Cys system was observed to be quenched by lead(II) ions (Pb2+). After optimization of some important experimental conditions, including concentrations of GQDs and L-Cys, potential scan rate, response time, and pH value, an ECL sensor was developed for the detection of Pb2+. The new methodology can offer a rapid, reliable, and selective detection of Pb2+ with a detection limit of 70 nM and a dynamic range from 100 nM to 10 mu M.
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