Carbon Letters 2023 KCI Impact Factor : 1.35 KCI-WoS Impact Factor : 6.04
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pISSN : 1976-4251 / eISSN : 2233-4998
- https://journal.kci.go.kr/carbon
KJCKorea
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Concentration-dependent emission of nitrogen-doped carbon dots and its use in hazardous metal-ion detection
- Carbon Letters
- Abbr : Carbon Lett.
- 2021, 31(3), pp.523-536
- DOI : 10.1007/s42823-020-00182-6
- Publisher : Korean Carbon Society
- Research Area : Natural Science > Natural Science General > Other Natural Sciences General
- Received : June 2, 2020
- Accepted : August 28, 2020
- Published : June 1, 2021
JANA JAYASMITA 1, Hur, Seung Hyun 1
1울산대학교
Accredited
ABSTRACT
Nitrogen-doped carbon dots (CDts) with tunable fuorescence properties in aqueous media were synthesized hydrothermally.
The excitation wavelength variation to obtain the maximum emission produced a blue shift in the emission peaks upon dilution in an aqueous solution. The shift can be explained by a re-absorption phenomenon in a concentrated solution. The interparticle interaction within was responsible to show dilution-dependent optical behavior. The as-synthesized solution of CDts did not show any prominent absorption peak over a wide range. However, upon dilution, two peaks became predominant.
The concentration-dependent behavior was observed during the interaction with metal cations. Cationic salts of Co(II) and Hg(II) caused quenching at diferent dilutions of CDts. This might be explained by the exposure of diferent surface functional groups during dilution and metal-ion–CDts charge transfer. The quenched fuorescence of CDts was rescued using ascorbic acid. Therefore, the one-pot detection of Co(II)/Hg(II) and ascorbic acid was designed through a ‘Turn Of/On’ phenomenon.
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