Microwave-Assisted Synthesis of Wavelength-Tunable Photoluminescent Carbon Nanodots and Their Potential Applications

A facile and rapid strategy was developed for the synthesis of ultrabright luminescent carbon nanodots (CDs) with tunable wavelength from 464 to 556 nm by introducing glutaraldehyde into the precursor solution under microwave irradiation. The fluorescence properties, including excitation and emissio...

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Published inACS applied materials & interfaces Vol. 7; no. 8; pp. 4913 - 4920
Main Authors Liu, Hongying, He, Zhimei, Jiang, Li-Ping, Zhu, Jun-Jie
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 04.03.2015
Subjects
Carbon - chemistry
Cell Survival - drug effects
Cobalt - analysis
Fluorescent Dyes - chemistry
Fluorescent Dyes - metabolism
Glutaral - chemistry
HeLa Cells
Humans
Ions - chemistry
Metals - chemistry
Microscopy, Confocal
Microwaves
Photoelectron Spectroscopy
Polyethyleneimine - chemistry
Quantum Dots - chemistry
Quantum Dots - toxicity
Spectrometry, Fluorescence
Temperature
carbon nanodots
wavelength-tunable
imaging
microwave
Co2
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Summary:A facile and rapid strategy was developed for the synthesis of ultrabright luminescent carbon nanodots (CDs) with tunable wavelength from 464 to 556 nm by introducing glutaraldehyde into the precursor solution under microwave irradiation. The fluorescence properties, including excitation and emission wavelength, quantum yield, and size of the CDs, were adjusted by changing the amount of glutaraldehyde and poly­(ethylenimine). Several methods such as high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, and dynamic light scattering, UV–vis, fluorescence, and Fourier transform infrared spectroscopy were employed to study the morphology and the properties of CDs. The luminescence mechanism was also discussed. In addition, confocal microscopy imaging revealed that the as-prepared CDs could be used as effective fluorescent probes in the cell imaging without obvious cytotoxicity. Moreover, a novel sensor for the detection of Co2+ was proposed on the basis of Co2+-induced fluorescence quenching. These superior properties demonstrated the potential application of the CDs in cellular imaging and ion sensing.
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ISSN:1944-8244
1944-8252
DOI:10.1021/am508994w