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Pulse Duration and Wavelength Effects of Laser Ablation on the Oxidation, Hydrolysis, and Aging of Aluminum Nanoparticles in Water

1
The Guo China-US Photonics Laboratory, State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics, and Physics, Chinese Academy of Sciences, Changchun 130033, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
3
Theoretical Physics Department, University of Kassel, 34132 Kassel, Germany
4
National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), 115409 Moscow, Russia
5
The Institute of Optics, University of Rochester, Rochester, NY 14627, USA
*
Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(5), 767; https://doi.org/10.3390/nano9050767
Received: 27 April 2019 / Revised: 14 May 2019 / Accepted: 14 May 2019 / Published: 18 May 2019
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Abstract

We analyzed the formation of the aluminum (Al) nanoparticles (NPs) with triangular shape obtained by ablating Al bulk in liquid using pulses with different durations (5 ns, 200 ps, and 30 fs) and wavelengths (355 nm, 800 nm, and 1064 nm). We report three stages of synthesis and aging of Al NPs: Formation, transformation, and stable stage. The NPs prepared by different pulses are almost identical at the initial stage. The effects of duration and wavelength of the ablation pulses on the aging of NPs are revealed. Pulse duration is determined to be essential for morphological transformation of NPs, while pulse wavelength strongly influences particle sizes. NPs produced by ultra-short pulses have smaller sizes and narrow size distribution. We demonstrate that oxidation and hydrolysis of Al in water are the results of ablation for all pulse durations and wavelengths, which also strongly modify the preferable reaction path of NPs in water, thus affecting the composition and morphology of triangle NPs. The results of modeling of the NPs generation in water due to a 50 ps laser pulse interacting with a thick Al target are presented. Water-based effects in the formation of NPs, their evolution, and solidification are considered from the mechanical and thermophysical points of view. The detailed analysis of the modeling results allowed for determination of the main mechanism responsible for the ablation process followed by the NPs formation. View Full-Text
Keywords: pulsed laser ablation; aluminum; alumina; aluminum hydroxide; aging; morphology; molecular dynamics; two temperature model; modeling and simulations pulsed laser ablation; aluminum; alumina; aluminum hydroxide; aging; morphology; molecular dynamics; two temperature model; modeling and simulations
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Zhang, K.; Ivanov, D.S.; Ganeev, R.A.; Boltaev, G.S.; Krishnendu, P.S.; Singh, S.C.; Garcia, M.E.; Zavestovskaya, I.N.; Guo, C. Pulse Duration and Wavelength Effects of Laser Ablation on the Oxidation, Hydrolysis, and Aging of Aluminum Nanoparticles in Water. Nanomaterials 2019, 9, 767.

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