研究目的
To investigate the influence of laser ablation parameters on the holes structure of laser manufactured graphene paper microsieves for specific applications such as filtration of biological fluids or separation of solid particles from exploitation fluids.
研究成果
1. Graphene paper morphology revealed multi-layered petals of graphene arranged in parallel. 2. The energy of a laser pulse is crucial for the processing result, with lower pulse energies producing smaller diameter holes with better edge quality. 3. Increasing the number of pulses after hole creation does not significantly affect the diameter but may degrade edge quality. 4. Successful microsieve production requires 50 to 70 pulses at 20 μJ or 30 to 50 pulses at 50 μJ per hole.
研究不足
The study is limited by the specific parameters of laser ablation used (pulse energy, duration, wavelength, and repetition rate) and the material properties of the graphene paper. The applicability of the findings may be constrained to similar materials and laser systems.
1：Experimental Design and Method Selection:
A laser ablation method using a picosecond laser was applied to fabricate graphene paper microsieves. The study involved drilling holes in the microsieves using pulsed laser radiation with varying pulse energies and numbers of pulses.
2：Sample Selection and Data Sources:
Graphene paper of thickness 80–100 μm was used, produced at the Department of Chemical Synthesis and Flake Graphene, ?ukasiewicz Research Network—Institute of Electronic Materials Technology in Poland.
3：List of Experimental Equipment and Materials:
A PL2210/SH/TH/FH picosecond laser (EKSPLA), scanning electron microscope (Quanta 250 FEG SEM, FEI), and MATLAB software for parameter optimization.
4：Experimental Procedures and Operational Workflow:
Holes were drilled using laser pulses with energies from 5 to 100 μJ, durations of 60 ps, a wavelength of 355 nm, and a repetition rate of 1 kHz. The impact method used 10 to 100 pulses per hole.
5：Data Analysis Methods:
The quality of the holes was assessed based on diameter and edge quality, with results compared to Laguerre–Gauss calculations in MATLAB.
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picosecond laser
PL2210/SH/TH/FH
EKSPLA
Used for laser ablation to fabricate graphene paper microsieves.
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scanning electron microscope
Quanta 250 FEG SEM
FEI
Used to investigate the morphology of graphene paper before and after laser ablation.
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optical beam expander
BE05-355
Thorlabs
Used to enlarge the laser beam five times for quality improvement.
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telecentric lens
S4LFT4010/126
SILL
Used to focus laser radiation on the surface of the processed material.
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sliding table
PT3/M
Thorlabs
Used for positioning the material during laser processing.
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iris diaphragm
? 5.8 mm
Used to cut out the high-quality central part of the laser beam.
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galvanometric scanner
SS-IIE10 355 nm
RAYLASE
Used with a telecentric lens to focus radiation on the surface of the processed material.
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