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Proceedings Paper

Generation of metal nanoparticles by laser ablation of metal microparticles and plume dynamics
Author(s): Deoksuk Jang; Bukuk Oh; Dongsik Kim
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Paper Abstract

This paper describes the process of nanoparticle synthesis by laser ablation of consolidated microparticles, focusing on the dynamics of ablation plume. We have generated nanoparticles by high-power pulsed laser ablation of Al and Cu microparticles using a Q-switched Nd:YAG laser (wavelength 355 nm, FWHM 10 ns, fluence 0.8~2.0 J/cm2). Microparticles of mean diameter 18 ~ 80 micrometers are ablated in the ambient air. The generated nanoparticles are collected on a glass substrate and the scanning electron micrographs of the samples are examined for characterizing the particles. The effect of laser fluence and collector position on the distribution of particle size is investigated. Optical diagnostics and numerical simulations are conducted to study the flow field and plume dynamics. The dynamics of ablation plume and shock wave is analyzed by monitoring the photoacoustic probe-beam deflection signal. Nanosecond time-resolved images of the ablation process are also obtained by laser flash shadowgraphy. Based on the results of experiment and numerical simulation, discussions are made on the dynamics of ablation plume.

Paper Details

Date Published: 13 September 2002
PDF: 8 pages
Proc. SPIE 4760, High-Power Laser Ablation IV, (13 September 2002); doi: 10.1117/12.482061
Show Author Affiliations
Deoksuk Jang, Pohang Univ. of Science and Technology (South Korea)
Bukuk Oh, Pohang Univ. of Science and Technology (South Korea)
Dongsik Kim, Pohang Univ. of Science and Technology (South Korea)

Published in SPIE Proceedings Vol. 4760:
High-Power Laser Ablation IV
Claude R. Phipps, Editor(s)

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