Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 8, Pages 4913-4920Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am508994w
Keywords
microwave; carbon nanodots; wavelength-tunable; imaging; Co2+
Funding
- National Natural Science Foundation of China [21121091, 21405029, 21475057]
- International S&T Cooperation Projects of China [2010DFA42060]
- State Key Laboratory of Analytical Chemistry for Life Science [SKLACLS1305]
- Program for New Century Excellent Talents in University [NCET-12-0256]
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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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