研究目的
To synthesize colloidal silicon nanoparticles by laser ablation of a solid Si target in water and ethanol at different fluences and wavelengths, and to evaluate the possibility of laser fragmentation post-synthesis.
研究成果
Colloidal Si nanoparticles were successfully synthesized with sizes ranging from 2 to 11 nm. Raman spectroscopy proved to be a reliable method for size analysis. Lower fluences generally resulted in smaller nanoparticles, and post-synthesis laser treatment could be used for size selectivity.
研究不足
The study focused on specific fluences and wavelengths, and the generalizability of the findings to other conditions is not confirmed. The presence of amorphous silicon in some samples complicates size estimation.
1：Experimental Design and Method Selection:
Laser ablation of a solid Si target in water and ethanol at different fluences and wavelengths (1064 nm and 532 nm) was performed. The process included post-synthesis laser irradiation to evaluate fragmentation.
2：Sample Selection and Data Sources:
An n-type silicon pellet was used as the target, immersed in 5 ml of water or ethanol.
3：List of Experimental Equipment and Materials:
A Q-switched pulsed Nd:YAG laser (1064 nm and 532 nm), Raman spectrometer (DXR Thermo Fisher Scientific), Transmission Electron Microscope (Jeol JEM 2010).
4：0).
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The target was irradiated for 5 or 10 min at fluences of 0.530, 0.608, and 0.687 J cm?2. Post-synthesis, some samples were irradiated again to induce fragmentation.
5：530, 608, and 687 J cm?Post-synthesis, some samples were irradiated again to induce fragmentation.
Data Analysis Methods:
5. Data Analysis Methods: Raman spectra were analyzed using the Bond Polarizability Model (BPM) and One-Phonon Con?nement Model (PCM) to estimate nanoparticle sizes.
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