Citation: NIU Yu-Sheng, SUN Feng-Yue. Green, Low-cost Ball Milling-Hydrothermal Synthesis of Graphene Quantum Dots and Applications[J]. Chinese Journal of Analytical Chemistry, ;2017, 45(7): 996-1004. doi: 10.11895/j.issn.0253-3820.160853
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A ball milling method which is green with simple-manipulation and low-cost was used to prepare graphene as precursor for graphene quantum dots (GQDs) synthesis. Subsequently, GQDs with good dispersibility, uniform size distribution, average diameter of (4.80 ± 0.20) nm and 1-3 layers were prepared by one-step hydrothermal method. The morphology, structure and optical properties of the GQDs were characterized by high-resolution transmission electron microscopy (HRTEM), atomic force microscope (AFM), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), UV-Vis absorption and fluorescence spectroscopy. Furthermore, the GQDs were used in label-free and specific detection of ferric ion (Fe3+) with broad linear ranges of 2.0×10-6-7.0×10-4 mol/L and low detection limit of 1.8 × 10-6 mol/L (S/N=3). The possible mechanism was also discussed and the application of GQDs for Fe3+ detection in tap water was demonstrated. Finally, based on their low cytotoxicity and excellent biocompatibility, the as-prepared GQDs were successfully applied to efficient cell imaging. This work provides a new way for preparation of carbon-based nanomaterials and build a foundation for deepening applications of GQDs in bio-/chem- analysis, bioimaging, etc.
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