Maximova Ksenia, Aristov Andrei, Sentis Marc, Kabashin Andrei V
Aix-Marseille University-CNRS, UMR 7341 CNRS, LP3, Campus de Luminy-case 917, F-13288, Marseille Cedex 9, France.
Nanotechnology. 2015 Feb 13;26(6):065601. doi: 10.1088/0957-4484/26/6/065601. Epub 2015 Jan 21.
We report a size-controllable synthesis of stable aqueous solutions of ultrapure low-size-dispersed Au nanoparticles by methods of femtosecond laser fragmentation from preliminary formed colloids. Such approach makes possible the tuning of mean nanoparticle size between a few nm and several tens of nm under the size dispersion lower than 70% by varying the fluence of pumping radiation during the fragmentation procedure. The efficient size control is explained by 3D geometry of laser fragmentation by femtosecond laser-induced white light super-continuum and plasma-related phenomena. Despite the absence of any protective ligands, the nanoparticle solutions demonstrate exceptional stability due to electric repulsion effect associated with strong negative charging of formed nanoparticles. Stable aqueous solutions of bare gold nanoparticles present a unique object with a variety of potential applications in catalysis, surface-enhanced Raman spectroscopy, photovoltaics, biosensing and biomedicine.
我们报道了一种通过飞秒激光从预先形成的胶体中进行碎片化的方法，可控合成超纯低尺寸分散金纳米粒子稳定水溶液。通过在碎片化过程中改变泵浦辐射的能量密度，这种方法能够在尺寸分散低于70%的情况下，将平均纳米粒子尺寸调整在几纳米到几十纳米之间。飞秒激光诱导白光超连续谱和等离子体相关现象的三维激光碎片化几何结构解释了有效的尺寸控制。尽管没有任何保护配体，但由于形成的纳米粒子强烈带负电而产生的电排斥效应，纳米粒子溶液表现出非凡的稳定性。裸金纳米粒子的稳定水溶液是一种独特的物质，在催化、表面增强拉曼光谱、光伏、生物传感和生物医学等领域具有多种潜在应用。
