研究目的
Investigating the synthesis of luminescent carbon dots from toluene using femtosecond laser pulses and optimizing their optical properties.
研究成果
The study successfully demonstrated the synthesis of luminescent carbon dots from toluene using femtosecond laser pulses. The addition of polyethylene glycol resulted in CDs with enhanced quantum yield and improved spectral characteristics. The method offers new opportunities for the synthesis and optimization of carbon nanomaterials.
研究不足
The study is limited to the synthesis and characterization of carbon dots from toluene and its mixture with PEG using femtosecond laser pulses. The scalability of the method and the potential for industrial application were not explored.
1：Experimental Design and Method Selection:
The study involved the irradiation of toluene or its mixture with polyethylene glycol (PEG) by femtosecond laser pulses to synthesize carbon dots (CDs). The optical properties of the synthesized CDs were analyzed.
2：Sample Selection and Data Sources:
Pure toluene or toluene mixed with PEG in various volume ratios was used as the precursor material.
3：List of Experimental Equipment and Materials:
Femtosecond laser system (Spitfire, Spectra-Physics), cylindrical lens, UV-3600 spectrophotometer (Shimadzu), RF-5301PC spectrofluorimeter (Shimadzu), time-correlated single photon counting system (SPC-730, Becker&Hickl GmbH), atomic force microscopy unit (SMENA-B, NT-MDT), infrared microscope (Hyperion2000, Bruker), and IFS 66v/s vacuum infrared spectrometer (Bruker).
4：Experimental Procedures and Operational Workflow:
The samples were irradiated for several hours, followed by dilution with ethanol. Absorption and luminescence spectra were recorded, and the quantum yield was calculated. The morphology and composition of the CDs were analyzed using atomic force microscopy, Raman spectroscopy, and infrared spectroscopy.
5：Data Analysis Methods:
The luminescence quantum yield was determined relative to a reference, and the luminescence lifetime was measured using time-correlated single photon counting. The average hydrodynamic volume of particles was calculated based on luminescence anisotropy kinetics.
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Spitfire
Regenerative amplifier
Spectra-Physics
Amplification of femtosecond laser pulses
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UV-3600
Spectrophotometer
Shimadzu
Recording absorption spectra
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RF-5301PC
Spectrofluorimeter
Shimadzu
Measuring luminescence emission and excitation spectra
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SPC-730
Time-correlated single photon counting system
Becker&Hickl GmbH
Recording luminescence decay kinetics
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Hyperion2000
Infrared microscope
Bruker
Recording infrared spectra
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IFS 66v/s
Vacuum infrared spectrometer
Bruker
Recording infrared spectra
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SMENA-B
Atomic force microscopy unit
NT-MDT
Analyzing the topography of the sample surface
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