標題: Highly Sensitive and Selective Detection of Nanomolar Ferric Ions Using Dopamine Functionalized Graphene Quantum Dots
作者: Chowdhury, Ankan Dutta
Doong, Ruey-an
環境工程研究所
Institute of Environmental Engineering
關鍵字: ferric ions detection;graphene quantum dots (GQDs);dopamine-functionalized GQDs;fluorescence;selectivity
公開日期: 17-Aug-2016
摘要: The good stability, low cytotoxicity, and excellent photoluminescence property of graphene quantum dots (GQDs) make them an emerging class of promising materials in various application fields ranging from sensor to drug delivery. In the present work, the dopamine-functionalized GQDs (DA-GQDs) with stably bright blue fluorescence were successfully synthesized for low level Fe3+-ions detection. The as-synthesized GQDs are uniform in size with narrow-distributed particle size of 4.5 +/- 0.6 nm and high quantum yield of 10.2%. The amide linkage of GQDs with dopamine, confirmed by using XPS and FTIR spectra, results in the specific interaction between Fe3+ and catechol moiety of dopamine at the interfaces for highly sensitive and selective detection of Fe3+. A linear range of 20 nM to 2 mu M with a detection limit of 7.6 nM is obtained for Fe3+ detection by DA-GQDs. The selectivity of DA-GQDs sensing probe is significantly excellent in the presence of other interfering metal ions. In addition, the reaction mechanism for Fe3+ detection based on the complexation and oxidation of dopamine has been proposed and validated. Results obtained in this study clearly demonstrate the superiority of surface functionalized GQDs to Fe3+ detection, which can pave an avenue for the development of high performance and robust sensing probes for detection of metal ions and other organic metabolites in environmental and biomedical applications.
URI: http://dx.doi.org/10.1021/acsami.6b06266
http://hdl.handle.net/11536/134087
ISSN: 1944-8244
DOI: 10.1021/acsami.6b06266
期刊: ACS APPLIED MATERIALS & INTERFACES
Volume: 8
Issue: 32
起始頁: 21002
結束頁: 21010
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