Journal
MICROCHIMICA ACTA
Volume 184, Issue 2, Pages 445-451Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-016-2027-9
Keywords
Semiconducting polymer dots; Quenching-recovery; Transmission electron microscopy; Sulfide; Fluorescent probe
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Funding
- National Natural Science Foundation of China [21575004, 21271136]
- Program for New Century Excellent Talents in University [NCET-12-0599]
- SRF for ROCS, SEM
- Foundation for Innovation Team of Bioanalytical Chemistry of Anhui Province
- Natural Science Foundation of Anhui Province [1408085QB41]
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The authors describe a fluorescent probe for sulfide that is based on carboxy-functionalized semiconducting polymer dots (P-dots). The dots were prepared from carboxy-functionalized poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-(1,4-benzo-2,1'-3-thiadiazole)] (referred to as COOH-PFBT) via co-precipitation. The P-dots aggregate on addition of Cu(II) ions and their green fluorescence (with excitation/emission peaks at 455/540 nm) is then quenched. Fluorescence is restored on addition of sulfide to the aggregates due to the formation of CuS. This quenching-recovery (off-on) mechanism forms the basis for a new sulfide detection scheme. Fluorescence increases linearly in the 1.25 to 75.0 mu M sulfide concentration range, with a 0.45 mu M detection limit. Good selectivity over other anions is demonstrated. The method shows recoveries ranging between 98.6% and 105.7% when applied to the determination of sulfide in spiked real water samples.
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