Concentration-dependent color tunability of nitrogen-doped carbon dots and their application for iron(III) detection and multicolor bioimaging

The N-doped CDs with high quantum yield and stability are synthesized by rapid microwave route. As-prepared CDs exhibit multicolor fluorescence via adjusting their concentrations and could be used for biosensing and bioimaging. [Display omitted] Nitrogen doping can effectly adjust the compositions a...

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Bibliographic Details
Published in:Journal of colloid and interface science 2018-07, Vol.521, p.33-41
Main Authors: Wang, Chan, Hu, Tantan, Wen, Zhuoqi, Zhou, Jingdan, Wang, Xioajie, Wu, Qian, Wang, Chuanxi
Format: Article
Language:English
Subjects:
Biosensing and cellular imaging
Biosensing Techniques
Carbon - chemistry
Color
Concentration-dependent fluorescence
Fluorescent Dyes - chemistry
HeLa Cells
High quantum yield
Humans
Iron - analysis
Microscopy, Confocal
Microwaves
Multicolor fluorescence
Nitrogen - chemistry
Nitrogen-doped carbon dots
Optical Imaging
Oxygen - chemistry
Particle Size
Quantum Dots - chemistry
Spectrometry, Fluorescence
Surface Properties
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Summary:The N-doped CDs with high quantum yield and stability are synthesized by rapid microwave route. As-prepared CDs exhibit multicolor fluorescence via adjusting their concentrations and could be used for biosensing and bioimaging. [Display omitted] Nitrogen doping can effectly adjust the compositions and structures of carbon dots and hence enhance their fluorescence. In this work, we report a fast and low-cost route for synthesis of nitrogen-doped carbon dots (N-CDs) by microwave pyrolysis of citric acid and ammonium within 7 min. The as-prepared N-CDs contain plentiful oxygen and nitrogen functional groups, and dispaly intense fluorescence with high quantum yield of ca. 44.3% and have an average size of 1.8 nm. The obtained N-CDs exhibit highly stable against photobleaching, ionic strengths, and can be used for selective and sensitive detection of Fe(III). It is postulated that the Fe3+-mediated fluorescence quenching is attributed to the charge transfer between N-CDs and Fe3+. In particular, the emission peaks from blue to red region can be tuned by interparticle distance of N-CDs, simply by increasing the concentration of N-CDs in aqueous solution, which indicates its potential applications as a promising optical image probe in multicolor cellular imaging.
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2018.03.021