研究目的
Investigating the facile and green approach to produce graphene quantum dots (GQDs) from graphite flakes via a pulsed laser ablation (PLA) method assisted by high-power sonication, and the selective production of either functional GQDs or graphene oxide quantum dots (GOQDs) by controlling the sonication during the PLA process.
研究成果
The study successfully demonstrates a facile and green approach to produce GQDs from graphite flakes via PLA assisted by high-power sonication. The method allows for the selective production of either GQDs or GOQDs by controlling the sonication during the PLA process. The produced GQDs and GOQDs exhibit distinct structural, chemical, and optical properties, highlighting the potential of this method for designing functional carbon materials.
研究不足
The study focuses on the synthesis and characterization of GQDs and GOQDs from graphite flakes using PLA with or without high-power sonication. The limitations include the need for further optimization of the process parameters for higher yield and the exploration of the scalability of the method for industrial applications.
1：Experimental Design and Method Selection:
The study employs a pulsed laser ablation (PLA) method combined with high-power sonication to produce GQDs from graphite flakes. The method selection is based on the need for a facile, green, and economic synthetic method for GQDs.
2：Sample Selection and Data Sources:
500 mg of graphite flakes was dispersed in 200 ml of ethanol by high-power tip-type ultra-sonication during the laser ablation process.
3：List of Experimental Equipment and Materials:
Graphite flakes (HQ graphene, Netherlands), ethanol (>99%, Sigma Aldrich), Q-switch ND:YAG laser system (355 nm, third harmonic), tip-type sonicator, centrifuge, syringe filters (Millipore, 0.22 μm pore size).
4：22 μm pore size).
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The graphite suspension was ablated by a horizontal pulsed laser beam at a repetition rate of 10 Hz, with a pulsed width of 10 nm and ablation energy of 1.5 W. The process was performed at room temperature and in the air for 30 min. After PLA treatment, the suspension was centrifuged and filtered.
5：5 W. The process was performed at room temperature and in the air for 30 min. After PLA treatment, the suspension was centrifuged and filtered.
Data Analysis Methods:
5. Data Analysis Methods: HR-TEM, XPS, PL spectra, Raman spectroscopy, UV-vis absorbance, and time-correlated single photon counting (TCSPC) were used to analyze the structural, chemical, and optical properties of the produced GQDs and GOQDs.
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