Hydrodynamic size distribution of gold nanoparticles controlled by repetition rate during pulsed laser ablation in water
Hydrodynamic size distribution of gold nanoparticles controlled by repetition rate during pulsed laser ablation in water
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DOI：
10.1016/j.apsusc.2010.12.037
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发表时间：
2011-02-15
影响因子：
6.7
通讯作者：
Barcikowski, Stephan
中科院分区：
文献类型：
--
作者：
Menendez-Manjon, Ana;Barcikowski, Stephan
尽管纳米颗粒的流体动力学尺寸非常重要，但大多数关于激光生成和纳米颗粒破碎的研究都集中在费雷特颗粒尺寸上，例如在生物技术中用于活细胞扩散，或在工程中用于调整悬浮液的流变学。从这个意义上说，通过动态光散射测量的等离子体共振和流体动力学直径，研究了在去离子水中使用飞秒激光烧蚀在可变脉冲重复率（100-5000 Hz）下金胶体纳米粒子的形成和破碎。重复率的增加不会影响烧蚀效率，但会导致所生成的金纳米颗粒的流体动力学直径减小和等离子共振蓝移。在线测量胶体脉冲间照射引起的碎片，表明低重复率更有效。脉冲重复率被证明是用于纳米粒子流体动力学尺寸控制的合适激光参数，而不进一步影响生产效率。 (c) 2010 Elsevier B.V. 保留所有权利。
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. (c) 2010 Elsevier B.V. All rights reserved.