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首页> 外文期刊>Applied Surface Science >Hydrodynamic size distribution of gold nanoparticles controlled by repetition rate during pulsed laser ablation in water
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Hydrodynamic size distribution of gold nanoparticles controlled by repetition rate during pulsed laser ablation in water

机译：水中脉冲激光烧蚀过程中重复率控制的金纳米颗粒的流体动力学尺寸分布

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摘要

Most investigations on the laser generation and fragmentation of nanoparticles focus on Feret particle size, although the hydrodynamic size of nanoparticles is of great importance, for example in biotechnology for diffusion in living cells, or in engineering, for a tuned rheology of suspensions. In this sense, the formation and fragmentation of gold colloidal nanoparticles using femtosecond laser ablation at variable pulse repetition rates (100-5000 Hz) in deionized water were investigated through their plasmon resonance and hydrodynamic diameter, measured by Dynamic Light Scattering. The increment of the repetition rate does not influence the ablation efficiency, but produces a decrease of the hydrodynamic diameter and blue-shift of the plasmon resonance of the generated gold nanoparticles. Fragmentation, induced by inter-pulse irradiation of the colloids was measured online, showing to be more effective low repetition rates. The pulse repetition rate is shown to be an appropriate laser parameter for hydrodynamic size control of nanoparticles without further influence on the production efficiency.
机译：尽管纳米颗粒的流体动力学尺寸非常重要，例如在生物技术中用于在活细胞中扩散，或在工程学中用于调节悬浮液的流变学，但大多数有关纳米颗粒激光产生和破碎的研究都集中在费雷特粒度上。从这个意义上讲，通过飞秒激光烧蚀在去离子水中以可变的脉冲重复频率（100-5000 Hz）通过飞秒激光消融，通过等离子共振和流体动力学直径（通过动态光散射测量）研究了金胶体纳米颗粒的形成和破碎。重复率的增加不影响消融效率，但是使所生成的金纳米颗粒的流体动力学直径减小，并且等离子体激元共振发生蓝移。在线测量由脉冲间照射胶体引起的碎裂，显示出更有效的低重复率。示出脉冲重复率是用于纳米颗粒的流体动力学尺寸控制的合适的激光参数，而不进一步影响生产效率。

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