Graphene enhanced electrochemiluminescence of CdS nanocrystal for H2O2 sensing.
Graphene-CdS (G-CdS) nanocomposites were successfully prepared by CdS nanocrystals (CdS NCs) formed in situ on the surface of graphene sheets, using graphene oxide (GO) sheets with rich negatively charged carboxylic acid groups as starting materials. Compared with pure CdS NCs, the presence of the graphene doped in G-CdS nanocomposites could facilitate the electrochemical redox process of CdS NCs; further, the as-prepared G-CdS nanocomposite can react with H(2)O(2) to generate strong and stable electrochemiluminescent (ECL) emission, which not only enhances its ECL intensity by about 4.3-fold but also decreases its onset potential for about 320 mV. The as-prepared solid-state ECL H(2)O(2) sensor shows acceptable linear response from 5 microM up to 1mM with a detection limit of 1.7 microM (S/N=3). The ECL H(2)O(2) sensor exhibits excellent reproducibility and long-term stability. Such a property would promote the potential application of the graphene as enhanced materials in fabricating sensors for chemical and biochemical analysis.
Wang
Kun
K
Key Laboratory of Modern Agriculture Equipment and Technology, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China. wangkun@ujs.edu.cn
Liu
Qian
Q
Wu
Xiang-Yang
XY
Guan
Qing-Meng
QM
Li
He-Nan
HN