研究目的
Investigating the structural kinetics of picosecond laser-induced heating and fragmentation of colloidal gold spheres.
研究成果
The study concludes that picosecond laser-induced fragmentation of gold nanoparticles is a single-step, instantaneous process, producing small fragments (2-3 nm) within 30 ns. The presence of NaCl/NaOH solution limits further growth of these fragments, suggesting a method for producing stable, small gold nanoparticles.
研究不足
The study is limited by the time resolution of the X-ray pulses (80 ps) and the challenges in distinguishing between different fragmentation mechanisms (thermal phase explosion vs. Coulomb instability).
1：Experimental Design and Method Selection:
The study employs time-resolved X-ray scattering to observe the structural dynamics of gold nanoparticles under picosecond laser pulse excitation.
2：Sample Selection and Data Sources:
Colloidal gold nanoparticles of 54 nm diameter were synthesized by pulsed laser ablation in liquids (LAL) and subjected to centrifugal separation for size selection.
3：List of Experimental Equipment and Materials:
Equipment includes a picosecond laser (Edgewave), TEM (Zeiss EM 910), X-ray scattering setup at the European Synchrotron Radiation Facility, and analytical disc centrifuge (CPS Instrument DC 24000).
4：0). Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The nanoparticles were excited by laser pulses at 532 nm, and the structural changes were probed by X-ray scattering at delays from 100 picoseconds to 100 microseconds.
5：Data Analysis Methods:
Scattering data were analyzed for changes in lattice temperature, particle size, and crystallinity, with simulations aiding in interpreting the size distribution of fragments.
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