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1064-nm laser fragmentation of thin Au and Ag flakes in acetone for highly productive pathway to stable metal nanoparticles

机译:丙酮中的金和银薄片的1064 nm激光碎裂,可高效生产稳定的金属纳米颗粒

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The laser-induced fragmentation of thin An and Ag flakes in acetone by 1064-nm nanosecond laser (with the fluence typically similar to 2 J/cm(2)) potentially offers a highly productive pathway to stable metal nanoparticles in liquid. Acetone serves as a superior liquid medium that keeps fine metal nanoparticles free from precipitation even in such concentrated nanoparticle solutions exceeding similar to 0.1 M. Thin metal flakes have good capability to absorb the 1064-nm laser energy as efficiently as in the visible region. A part of the thus laser-heated molten flakes explosively split into submicroparticles, and some other significant part directly into fine nanoparticles. Both kinds of product particles have minor absorption cross-sections for subsequent laser pulses at 1064 nm, and thus no longer fragment further. One of the two kinds of Ag flakes studied in this work yielded fine Ag nanoparticles at a remarkable high production rate of 1.1 mg/min for the input laser power of only similar to 0.65 W. (c) 2006 Elsevier B.V. All rights reserved.
机译:通过1064 nm纳秒激光(在通量通量通常类似于2 J / cm(2))中,在丙酮中激光诱导的薄片状An和Ag碎裂,可能为液体中的稳定金属纳米粒子提供高生产率的途径。丙酮是一种优良的液体介质,即使在浓度超过0.1 M的浓缩纳米颗粒溶液中,也能使精细的金属纳米颗粒免于沉淀。薄金属片具有良好的吸收可见光范围内的1064 nm激光能量的能力。如此被激光加热的熔融薄片的一部分爆炸性地分裂为亚微粒,而另一些重要的部分则直接分裂为细的纳米颗粒。两种产物颗粒对于随后在1064 nm的激光脉冲都具有较小的吸收截面,因此不再进一步碎裂。在这项工作中研究的两种Ag薄片中的一种,以1.1 mg / min的高生产率产生了细小的Ag纳米颗粒,其输入激光功率仅与0.65 W相似。(c)2006 Elsevier B.V.保留所有权利。

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