首页|Novel N, F co-doped carbon dots to detect sulfide and cadmium ions with high selectivity and sensitivity based on a "turn-off-on" mechanism
Novel N, F co-doped carbon dots to detect sulfide and cadmium ions with high selectivity and sensitivity based on a "turn-off-on" mechanism
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NSTL
Elsevier
In this work, novel nitrogen, fluorine co-doped carbon dots (N, F-CDs) have been synthesized by a hydrothermal method using melamine and 2, 4-difluorobenzoic acid as precursors. The obtained N, F-CDs exhibit excellent optical stability with high quantum yield. The N, F-CDs are highly selective to S2- detection by forming N, FCDs@S2- , with a detection limit of 168 nM. The N, F-CDs@S2- were shown to be a highly selective Cd2+ detector by forming CdS, with a detection limit of 340 nM. The fluorescence quenching of N, F-CDs by S2- occurs via a static quenching mechanism and the fluorescence recovery was due to the high affinity of Cd2+ to S2-. The fluorescent sensor was used to determine Cd2+ and S2- in tap waters with satisfactory results.
NSTL
Elsevier
