Journal
ANALYTICAL CHEMISTRY
Volume 89, Issue 15, Pages 8044-8049Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.7b01443
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Funding
- National Natural Science Foundations of China [21327007, 21575031]
- Natural Science Foundation of Guangxi Province [2015GXNSFDA139006]
- BAGUI Scholar Program
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The ratiometric fluorescence assay, which can eliminate the external effects, has attracted great attention. In this work, a carbon dot (CD)-based nanohybrid dual-emission system was simply prepared by a unique approach of solvothermal treating corn bract and used as a ratiometric fluorescent sensor for Hg2+ detection. Under a single excitation, the obtained nanohybrid sensor had two emission bands around 470 and 678 nm, which may originate from the intrinsic structure of CDs and chlorophyll-derived porphyrins, respectively. In the presence of Hg2+, the fluorescence at 678 nm could be remarkably quenched, while the fluorescence intensity at 470 nm was only slightly altered. The fluorescence intensity ratio at 470 and 678 nm exhibited a good linear relationship in the Hg2+ concentration range from 0 to 40 mu M with a detection limit of about 9.0 nM. It also had a satisfying assay performance in serum and river water samples. The prepared CD-based nanohybrid sensor here may hold the further potential applications in biomedicine study, environmental protection, and food safety.
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