期刊
TALANTA
卷 117, 期 -, 页码 152-157出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2013.08.055
关键词
Graphene quantum dots; Transition metal ions; Photoluminescence; Quenching
资金
- National Natural Science Foundation of China [21035005, 20975004, 21275011]
The electron-transfer based quenching effect of commonly encountered transition metal ions on the photoluminescence of grapheme quantum dots (GQDs) was for the first time investigated, and was found to be associated with electron configuration of the individual metal ion. Ethylene diamine tetraacetic acid (EDTA), the metal ion chelator, can competitively interact with metal ions to recover the quenched photoluminescence of GQDs. Basically, metal ions with empty or completely filled d orbits could not quench the photoluminescence of GQDs, but this quenching effect was observed for the metal ions with partly filled d orbits. Based on the quenching-recovering strategy, a simple optical metal sensing platform was established by taking Ni2+ as an example. Using the nickel ion-specific chelating reagent, dimethylglyoxime (DMG), to replace EDTA, a detection limit of 4.1 mu M was obtained in standard solution. This proposed strategy does not need further. functionalization of GQDs, facilitating the application for simple, fast and cost-effective screening of metal ions. (C) 2013 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据