研究目的
Investigating the synthesis of carbon quantum dots (CQDs) by direct carbonization of carbonaceous microcrystals in mesophase pitch and their application in fluorescent detection of Fe3+ ions.
研究成果
The study successfully synthesized CQDs with well-controlled size and high quantum yield (87%) by direct carbonization of dispersed carbonaceous microcrystals in mesophase pitch. The CQDs exhibited excellent fluorescence properties and were effectively applied to the fluorescent detection of Fe3+ ions, demonstrating good specificity and sensitivity.
研究不足
The study focuses on the synthesis and application of CQDs derived from mesophase pitch, with limitations including the need for precise control of nucleation temperature and the potential for coalescence of CQDs at high concentrations.
1：Experimental Design and Method Selection:
The study involves the synthesis of CQDs by direct carbonization of dispersed carbonaceous microcrystals in mesophase pitch, adjusting the nucleation temperature to modulate the size of CQDs.
2：Sample Selection and Data Sources:
Slurry oil extracted from a column side by a vacuum distillation was selected as the raw material.
3：List of Experimental Equipment and Materials:
Polarization microscope (DM 2500P, Leica Microsystems), atomic force microscope (AFM, Bruker MultiMode 8), X-ray photoelectron spectroscopy (XPS, ESCALAB 250), Raman analysis (XploRA Raman spectrometer), transmission electron microscope (TEM, JEM2100), high resolution TEM (HRTEM, F20), photoluminescence (PL, Hitachi F-7000), and UV-Vis absorption (Shimadzu UV-2600) spectra analyses.
4：Experimental Procedures and Operational Workflow:
The slurry oil was melted and calcined at 420–450 °C in Ar atmosphere to produce mesophase pitch (MP). The MP was then dispersed in xylene and calcined at 700 °C to produce CQDs.
5：Data Analysis Methods:
The size distribution and fluorescence properties of CQDs were analyzed using AFM, TEM, HRTEM, PL, and UV-Vis absorption spectra.
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Polarization microscope
DM 2500P
Leica Microsystems
Observation of mesophase pitch
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Atomic force microscope
MultiMode 8
Bruker
Observation of CQDs
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Photoluminescence spectrometer
F-7000
Hitachi
PL spectra analysis of CQDs
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UV-Vis absorption spectrometer
UV-2600
Shimadzu
UV-Vis absorption spectra analysis of CQDs
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X-ray photoelectron spectroscopy
ESCALAB 250
Analysis of CQDs
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Raman spectrometer
XploRA
Raman analysis of CQDs
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Transmission electron microscope
JEM2100
Observation of CQDs
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High resolution TEM
F20
High resolution observation of CQDs
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