Citation:
LI Jun-Fen, WANG Dong-Xiu, LI Peng-Xia, DONG Chuan. One-Step Hydrothermal Synthesis of Carbon Dots for Detection of Manganese (Ⅶ)[J]. Chinese Journal of Analytical Chemistry,
;2019, 47(5): 731-738.
doi:
10.19756/j.issn.0253-3820.191034
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A convenient and green strategy was developed for the synthesis of water-soluble carbon dots (CDs) with blue fluorescence by one-step hydrothermal synthesis method using mandelic acid and proline as carbon precursor and nitrogen dopant, respectively. The synthesized CDs were characterized by transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), ultraviolet visible spectroscopy (UV) and fluorescence, respectively. The CDs were quasi spherical nano-particles with perfect monodispersity, and the average size was 2.62 ±0.20 nm. They possessed crystal structures and the distinct lattice spacing was 0.21 nm. Abundant groups like C=C, hydroxyl, carboxylic and amine groups, etc, were linked on the surface of the synthesized CDs. The CDs showed typical excitation-dependent photoluminescent behavior with the maximum excitation and emission wavelengths of 360 nm and 450 nm, respectively. The effects of ionic strength, pH and storage time on the fluorescence intensity of the CDs were slight, which demonstrated the perfect fluorescence stability of the CDs. Based on fluorescence resonance energy transfer (FRET) mechanism between donor CDs and acceptor Mn(Ⅶ), the fluorescence of CDs could be effectively quenched by Mn(Ⅶ). On the basis of this, a method was developed for detection of Mn(Ⅶ). The method showed a linear range of 1-100 μmol/L (i.e., 0.055-5.500 mg/L) with a correlation coefficient (R2) of 0.9986. The limit of detection was 0.04 μmol/L (i.e., 2.20 μg/L), showing excellent sensitivity and selectivity. Due to low toxicity and excellent biocompatibility of CDs, HepG2 cells emitted blue fluorescence after incubated with CDs, and intracellular fluorescence intensities were roughly linear with Mn(Ⅶ) concentration, which enabled the potential applications of CDs in Mn(Ⅶ) biosensing. In brief, the CDs were designed as successful fluorescent sensors for direct determination of Mn(Ⅶ) content in aqueous solution and living cell.
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Keywords:
- Carbon dots,
- Synthesis,
- Fluorescence quenching,
- Manganese (Ⅶ)
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