N, S co-doped carbon dots with high quantum yield: tunable fluorescence in liquid/solid and extensible applications
Abstract
A set of the highly fluorescent N, S co-doped carbon dots (NSCDs) were prepared through one-step hydrothermal synthesis at different temperature with citric acid as the carbon source and cysteamine as the N, S source. The NSCDs synthesized at 200 °C show significant quantum yield (81%) due to its optimal structure. The structure of the NSCDs changed with varying degrees of carbonization/aromatization and different content of multifunctional groups of C=O, -NH2, -OH, -SH, and N, S-aromatic heterocycte under different preparation temperatures, thus exhibiting tunable fluorescence. Especially, the obtained NSCDs exhibited a blue fluorescence in solution state and changed from strong blue to yellowish-green in its solid state under UV light as a result of the increase in preparation temperature. The as-prepared NSCDs can be used in selective detection of complex anions such as Cr2O7 2- and Fe(CN)6 3-, cell imaging, and preparation of fluorescent composite films.
- Publication:
-
Journal of Nanoparticle Research
- Pub Date:
- June 2017
- DOI:
- 10.1007/s11051-017-3914-7
- Bibcode:
- 2017JNR....19..217Y
- Keywords:
-
- Carbon dots;
- High quantum yield;
- Tunable fluorescence;
- Complex anion detection;
- Fluorescent composite film;
- Sensor