研究目的
Investigating the mechanisms of the laser-induced generation of NPs in water during the interaction of fs radiation with a solid target.
研究成果
The developed MD-TTM model successfully characterizes the growth of metal nanoparticles under ultrashort laser ablation in water, revealing mechanisms responsible for bimodal NPs size distribution. The study suggests that thermal and mechanical damage regimes can be manipulated via irradiation parameters to control NP size distribution.
研究不足
The model does not include any chemistry due to the high computational cost, and the effect of chemical additives on NP size distribution is not accounted for.
1：Experimental Design and Method Selection:
The study combines the Molecular Dynamics (MD) and Two Temperature Model (TTM) approaches to model ultrashort laser pulse interaction with metal targets in water.
2：Sample Selection and Data Sources:
Gold targets were used for ablation in deionized water.
3：List of Experimental Equipment and Materials:
A Yb: KGW femtosecond laser was used for ablation, and a high-resolution transmission electron microscopy (HR-TEM) system for examining size characteristics of laser-synthesized Au NPs.
4：Experimental Procedures and Operational Workflow:
The target was moved constantly in the focusing plane with a speed of
5：5 mm/s, while keeping the same thickness of the liquid above the target. Data Analysis Methods:
The model accounts for the kinetics of fast laser-induced nonequilibrium phase transitions, laser pulse absorption, fast electron heat conduction, and strong electron–phonon nonequilibrium.
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