研究目的
To develop a highly sensitive and selective colorimetric method for dopamine detection using Ag2S@CeO2 microspheres with enhanced peroxidase-like activity.
研究成果
The Ag2S@CeO2 microspheres exhibited highly improved peroxidase-like activity and were successfully used for the sensitive and selective detection of dopamine. The synergistic effect of catalytic active species on the surface of CeO2 and the electron transfer between CeO2 and Ag2S contributed to the enhanced activity.
研究不足
The catalytic activity of Ag2S@CeO2 is dependent on pH, temperature, H2O2 concentration, and the amount of catalyst, which may limit its application under extreme conditions.
1：Experimental Design and Method Selection:
The Ag2S@CeO2 microspheres were synthesized by a precipitation and hydrothermal method. The peroxidase-like activity was evaluated by the oxidation of TMB in the presence of H2O
2：Sample Selection and Data Sources:
AgNO3, Na2S?9H2O, Ce(NO3)3?6H2O, H2O2, TMB, and dopamine hydrochloride were used as materials.
3：List of Experimental Equipment and Materials:
XRD, SEM, HRTEM, UV-vis spectrometer, and fluorescence spectrophotometer were used for characterization.
4：Experimental Procedures and Operational Workflow:
The catalytic activity was tested under varying pH, temperature, H2O2 concentration, and catalyst amount.
5：Data Analysis Methods:
The kinetic parameters Km and Vmax were calculated using the double reciprocal curve of Michaelis-Menten equation.
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X-ray powder diffraction
Rigaku D/Max-rB
Rigaku
Characterization of phase composition
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Scanning electron microscopy
FEI APREO
FEI
Observation of morphology
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Transmission electron microscopy
FEI Tecnai G2 F20
FEI
Observation of morphology
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UV-visible-near-infrared spectrophotometer
HITACHI UH4150
HITACHI
Recording of UV-vis diffuse reflection spectra
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UV-vis spectrometer
TU 1810
Evaluation of catalytic activity
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Fluorescence spectrophotometer
Measurement of fluorescence spectra
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