期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 586, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.colsurfa.2019.124233
关键词
Carbon dots; Fluorescence probe; Metal ion detection; Tea
资金
- National Natural Science Foundation of China [U1510125, 51502270, 21703209]
- Specialized Research Fund for Sanjin Scholars Program of Shanxi Province
- Program for the Outstanding Innovative Teams of Higher Learning Institutions of Shanxi
- Transformation of Scientific and Technological Achievements Programs of Higher Education Institutions in Shanxi (TSTAP)
- North University of China Fund for Scientific Innovation Team
Fluorescence carbon dots (CDs) are firstly obtained from microbial fermented Pu-erh tea by a simple brewing method without high temperature treatment as reported in literature. The obtained CDs contain abundant surface functional groups and exhibit a good ability to detect Fe and Cu ions. Moreover, a new sensing universal platform that can simultaneously apply fluorescent and colorimetric dual-readout for Cu2+ detection is constructed using the obtained CDs and o-phenylenediamine (OPD). Not only does this sensing platform exhibit much higher selectivity and sensitivity than pure CDs, but it also enhances detection scope for Cu2+. Its detection mechanism is dominated by synergistic combination of fluorescence quenching resulted from the co-ordination reaction of Cu2+ ions and fluorescence resonance energy transfer from CDs to the oxidation product of OPD.
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