研究目的
To develop a simple, mask-free, low-cost imprinted sensor based on laser scribed graphene (LSG) technology combined with molecularly imprinted polymers (MIPs) for the sensitive and selective detection of Bisphenol A (BPA) in water and plastic samples.
研究成果
The developed LSG-MIP sensor demonstrated high sensitivity and selectivity for BPA detection, with a limit of detection of 8 nM. The sensor was successfully applied to detect BPA in tap water, mineral water, and plastic samples. The combination of LSG technology with MIPs offers a practical, low-cost, and efficient method for BPA detection.
研究不足
The soft nature of graphene material may cause scratching on the surface leading to loss of durability and deterioration of electrical performance. The proposed sensor provided moderate reusability, with the oxidation current decaying after four measurements.
1：Experimental Design and Method Selection
The study combines LSG technology with MIPs for BPA detection. CO2 laser was used to produce LSG electrodes on flexible polyimide sheets. The LSG electrodes were functionalized with imprinted polypyrrole using BPA as a template molecule. The sensors were characterized using Raman spectroscopy, SEM, XRD, and AFM. Electrochemical measurements were performed using cyclic voltammetry (CV) and differential pulse voltammetry (DPV).
2：Sample Selection and Data Sources
BPA was used as the target analyte. Real samples included tap water, mineral water, and plastic samples (polycarbonate (PC) and polyethylene terephthalate (PET)).
3：List of Experimental Equipment and Materials
CO2 laser (Universal Laser Systems? PLS6.75), polyimide sheet (Kapton), pyrrole monomer, BPA, acetic acid, methanol, PBS tablets, electrochemical measurement workstation (Palmens, 4), FESEM (Carl Zeiss, Merlin), Raman spectrometer (LabRAM ARAMIS), X-ray diffractometer (Bruker Corporation, D8 ADVANCE).
4：Experimental Procedures and Operational Workflow
1. Fabrication of LSG electrodes using CO2 laser. 2. Functionalization of LSG with imprinted polypyrrole. 3. Characterization of sensors using Raman spectroscopy, SEM, XRD, and AFM. 4. Optimization of experimental conditions (pyrrole concentration, polymerization cycles, BPA concentration, incubation time). 5. Electrochemical measurements using CV and DPV. 6. Application of the sensor to real samples.
5：Data Analysis Methods
Electrochemical data were analyzed using PSTrace 5.5 software. The sensitivity and selectivity of the sensor were evaluated based on the electrochemical responses.
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CO2 laser
PLS6.75
Universal Laser Systems
Used to pattern conductive and multilayer graphene directly on commercial PI sheet.
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FESEM
Merlin
Carl Zeiss
Used to investigate electrode surface morphology.
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X-ray diffractometer
D8 ADVANCE
Bruker Corporation
Used to record X-ray diffraction data.
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Polyimide sheet
Kapton
Utech Products
Substrate for the fabrication of three electrode sensing system.
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Electrochemical measurement workstation
Palmens, 4
Used for electrochemical tests.
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Raman spectrometer
LabRAM ARAMIS
Horiba Scientific
Used to obtain Raman spectra.
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