title: Microwave-assisted synthesis of wavelength-tunable photoluminescent carbon nanodots and their potential applications.
abstract: 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 Co(2+) was proposed on the basis of Co(2+)-induced fluorescence quenching. These superior properties demonstrated the potential application of the CDs in cellular imaging and ion sensing.
authors: State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry & Chemical Engineering, Nanjing University , Nanjing 210093, People's Republic of China.
authors: Hongying
authors: H
authors: Liu
authors: Zhimei
authors: Z
authors: He
authors: Li-Ping
authors: LP
authors: Jiang
authors: Jun-Jie
authors: JJ
authors: Zhu
mesh_terms: D002244:Carbon / Q000737:chemistry*; D002470:Cell Survival / Q000187:drug effects; D003035:Cobalt / Q000032:analysis; D005456:Fluorescent Dyes / Q000737:chemistry / Q000378:metabolism; D005976:Glutaral / Q000737:chemistry; D006367:HeLa Cells; D006801:Humans; D007477:Ions / Q000737:chemistry; D008670:Metals / Q000737:chemistry; D018613:Microscopy, Confocal; D008872:Microwaves; D056951:Photoelectron Spectroscopy; D011094:Polyethyleneimine / Q000737:chemistry; D045663:Quantum Dots / Q000737:chemistry* / Q000633:toxicity; D013050:Spectrometry, Fluorescence; D013696:Temperature
chemical_list: D005456:Fluorescent Dyes; D007477:Ions; D008670:Metals; D003035:Cobalt; D002244:Carbon; D011094:Polyethyleneimine; D005976:Glutaral
keywords: Co2+; carbon nanodots; imaging; microwave; wavelength-tunable