Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 25, Issue 43, Pages 10188-10196Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201901748
Keywords
bioimaging; carbon nitride dots; fluorescence; luminescence; nanostructures
Categories
Funding
- National Natural Science Foundation of China [21775018, 21675022]
- Natural Science Foundation of Jiangsu Province [BK20160028, BK20170084]
- Open Funds of the State Key Laboratory of Electroanalytical Chemistry [SKLEAC201909]
- Fundamental Research Funds for the Central Universities
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The fabrication of carbon dots and their doped forms by top-down chemical cleavage has attracted considerable attention in the efforts to meet the increasing demands for optoelectronic applications ranging from biosensing to electro- and photocatalysis. However, due to strong quantum confinement effects, the size decrease often leads to an increase in the band gap, even in the emission of deep-ultraviolet (DUV) light, which greatly limits their applications. Here, we report a facile hot-tailoring strategy for fabricating carbon nitride nanodots (CNDs) with redshifted intrinsic photoluminescent (PL) emission, compared with the pristine bulk precursor. It has been found that the different leaving abilities of the C,N-containing groups during the pyrolysis stage and the chemical passivation during the liquid-collection stage played vital roles. Due to the redshifted photoluminescence and other attractive features, the as-obtained CNDs were successfully applied in visual double text encryption with higher security and also in bioimaging with photostability superior to traditional dyes. This work highlights the great potential of the hot-tailoring method in modulating carbon-based nanostructures and offsetting band-gap widening as the size decreases.
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