研究目的
Synthesis of nitrogen-doped graphene quantum dots (N-GQDs) with high photoluminescence quantum yield (PLQY) via a top-down approach using N-containing 3D nanocarbon hybrids as both carbon and nitrogen sources.
研究成果
The study successfully synthesized monodisperse, highly crystallized, and stable blue-luminescent N-GQDs with a high PLQY of ~19.3% using a facile electrochemical method. The high N-doping content and the method's green and economical nature open new avenues for the preparation of heteroatom-doped GQDs for various applications.
研究不足
The study focuses on the synthesis and characterization of N-GQDs, with limited discussion on their application potential and scalability of the synthesis method.
1：Experimental Design and Method Selection:
Electrochemical method was applied for the synthesis of N-GQDs, using N-containing 3D nanocarbon hybrids as the carbon and nitrogen sources, cut into small fragments in ammonia solution as the electrolyte.
2：Sample Selection and Data Sources:
N-CNT/N-Graphene hybrids were prepared as the raw material. The N-GQDs were synthesized in a two-electrode system with N-CNT/N-graphite as the working electrode and a platinum sheet as the counter electrode.
3：List of Experimental Equipment and Materials:
Nickel foam (NF), melamine, hydrogen, Ar:H2 mixed gas, ammonia solution, membrane filter, rotary evaporator, environmental transmission electron microscopy (ETEM, Titan G2), X-ray photoelectron spectroscopy (XPS, ESCALAB250Xi), Raman spectroscopy (Horiba Evolution), fluorescence emission photometer (FluoroMax-4), UV?visible spectrometer (Lambda 750), FT-IR spectrometer (Nicolet 5700).
4：0).
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The synthesis involved preparing 3D N-CNT/N-Graphene hybrids, followed by electrochemical cutting in ammonia solution to produce N-GQDs. The product was then purified and characterized.
5：Data Analysis Methods:
The PLQY was calculated using quinine sulfate as the standard sample. The structure and properties of N-GQDs were analyzed using TEM, XPS, Raman spectroscopy, PL mapping, UV-vis absorption, and FT-IR spectra.
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