Large-scale production of nanocrystals by laser ablation of microparticles in a flowing aerosol
Large-scale production of nanocrystals by laser ablation of microparticles in a flowing aerosol
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DOI：
10.1063/1.1347385
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发表时间：
2001-02-19
影响因子：
4
通讯作者：
Glicksman, HD
中科院分区：
文献类型：
--
作者：
Nichols, WT;Keto, JW;Glicksman, HD
我们的实验表明，通过激光烧蚀的微粒夹带在流动的气溶胶中的高密度的纳米粒子的生产。目前测得的每小时20克的生产速率可以按比例扩大到工业上有用的速率。我们已经表征了颗粒的尺寸分布，并发现了几乎单分散的分布，其中平均尺寸较小，并且随着激光能量密度的变化比观察到的在平板上保持的微粒的烧蚀更少。通过改变载气的类型和压力将平均尺寸控制在4-20 nm。我们发现Ag和CdSe纳米粒子是结晶的，几乎没有位错。测试的材料包括金属（Ag、Au和W）、半导体（Si、CdSe、GaN和ZnO）、陶瓷（WC、SiC和YBa 2Cu 3 O 7）和铁电体。描述了两种类型的收集过程，其即使在高质量密度下也保持颗粒的非团聚性质。(C)2001年美国物理学会。
We experimentally demonstrate the production of nanoparticles by laser ablation of microparticles entrained at high density in a flowing aerosol. The currently measured production rate of 20 grams per hour could be scaled to industrially useful rates. We have characterized the size distribution of particles and found nearly monodisperse distributions where mean sizes were smaller and varied less with laser fluence than was observed for ablation of microparticles held on flat plates. Mean size was controlled from 4-20 nm by varying the type and pressure of carrier gas. We found Ag and CdSe nanoparticles were crystalline having few dislocations. Materials tested included metals (Ag, Au, and W), semiconductors (Si, CdSe, GaN, and ZnO), ceramics (WC, SiC, and YBa2Cu3O7), and a ferroelectric. Two types of collection processes are described that preserve the nonagglomerated nature of the particles, even at high mass densities. (C) 2001 American Institute of Physics.