Journal
MICROCHIMICA ACTA
Volume 183, Issue 2, Pages 773-780Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-015-1712-4
Keywords
Carbon nitride nanosheets; Urea; Quenching; Photo-induced electron transfer; Transmission electron microscopy
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Funding
- National Natural Science Foundation of China [NSFC-21365014, NSFC-21305061]
- Natural Science Foundation of Jiangxi Province [20132BAB213011, 20132BAB203011]
- State Key Laboratory of Food Science and Technology of Nanchang University [SKLF-ZZA201302, SKLF-ZZB201303]
- Graduate Student Innovation Program [cx2015054]
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Bulk graphitic carbon nitride (g-C3N4) was obtained by pyrolysis of urea at 600 A degrees C. The material was then subjected to protonation and exfoliation to obtain strongly fluorescent g-C3N4 nanosheets. These nanosheets are representing a two-dimensional layered material that emits strong blue fluorescence peaking at 434 nm, and their quantum yield of up to 10.3 % is much higher than that of bulk g-C3N4 (6.0 %). It was found that Cu(II) ions quench the fluorescence of the nanosheets due to photo-induced electron transfer (PET), probably the result of the stronger binding affinity between Cu(II) and the nitrogen and oxygen functional groups of the nanosheets. The probe responds to Cu(II) in the 0.01 to 0.4 nM concentration range, with a 8 pM detection limit. The method was applied to the determination of Cu(II) in spiked water samples.
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