研究目的
Developing a novel and facile fluorescent nanoprobe with stable fluorescence and low toxicity for the determination of Fe3+ ions.
研究成果
The study successfully developed a facile and efficient strategy to prepare N-GQDs with excellent yields. The N-GQDs exhibited uniform size distribution, good stability, and were highly selective and sensitive to the determination of Fe3+ ions. The fluorescence quenching mechanism was identified as a dynamic quenching process, and the narrow band gap of N-GQDs facilitated electron transfer to Fe3+.
研究不足
The quantum yield of N-GQDs needs further improvement, possibly due to the oxidation of surface state.
1：Experimental Design and Method Selection:
N-GQDs were synthesized by electrochemical oxidation of a carbon cloth electrode coated with nitrogen-doped nanomesh graphene (NG).
2：Sample Selection and Data Sources:
The carbon cloth electrode was prepared by coating the mixture containing NG and PTFE binder in ethanol.
3：List of Experimental Equipment and Materials:
Transmission electron microscope (TEM), atomic force microscopes (AFM), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy analysis (XPS), Raman spectroscopy, UV-Vis spectrophotometer, fluorescence spectrophotometer, inductively coupled plasma optical emission spectrometry (ICP-OES).
4：Experimental Procedures and Operational Workflow:
The electrode was dried and used as an anode in a DC power setup with a Pt foil as a counter electrode. The electrolyte was dialyzed and freeze-dried for further use.
5：Data Analysis Methods:
The fluorescence emission spectra were measured, and the quantum yield was calculated. The sensitivity and selectivity of N-GQDs towards Fe3+ were investigated.
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Atomic force microscopes
Multimode 8
Bruker
Characterization of the morphology and size distribution of the N-GQDs
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Fourier transform infrared spectroscopy
Tensor II
Bruker
Confirmation of the chemical structure of the N-GQDs
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X-ray photoelectron spectroscopy analysis
K-Alpha spectrometer
Thermo Fisher
Confirmation of the chemical structure of the N-GQDs
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UV-Vis spectrophotometer
UV-2700
Shimadzu
Measurement of UV-Vis absorption spectra of the N-GQDs
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Fluorescence spectrophotometer
F-7000
Hitachi
Measurement of fluorescence emission spectra of the N-GQDs
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Transmission electron microscope
Tecnai G2 F20
FEI
Characterization of the morphology and size distribution of the N-GQDs
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Raman confocal microscope system
Xplora plus
Horiba scientific
Recording Raman spectroscopy
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Inductively coupled plasma optical emission spectrometry
Optima 7300 V
Analysis of the concentrations of Fe3+ ions in water samples
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