γ-Al2O3 nanoparticles synthesised by pulsed laser ablation in liquids: a plasma analysis

被引:128
作者
Lam, Julien [1 ,2 ,3 ]
Amans, David [1 ,2 ,3 ]
Chaput, Frederic [1 ,2 ,4 ]
Diouf, Mouhamed [1 ,2 ,3 ]
Ledoux, Gilles [1 ,2 ,3 ]
Mary, Nicolas [1 ,5 ]
Masenelli-Varlot, Karine [1 ,5 ]
Motto-Ros, Vincent [1 ,2 ,3 ]
Dujardin, Christophe [1 ,2 ,3 ]
机构
[1] Univ Lyon, PRES, F-69361 Lyon, France
[2] Univ Lyon 1, F-69622 Villeurbanne, France
[3] CNRS, Inst Lumiere Mat, UMR5306, Paris, France
[4] ENS Lyon, CNRS UMR5182, Chim Lab, F-69364 Lyon, France
[5] INSA Lyon, MATEIS, CNRS UMR5510, F-69621 Villeurbanne, France
关键词
INDUCED BREAKDOWN SPECTROSCOPY; CARBON NITRIDE; C-2; MOLECULES; SINGLE-PULSE; CUBIC-BN; WATER; ALUMINUM; TRANSITION; EMISSION; SPECTRA;
D O I
10.1039/c3cp53748j
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Pulsed laser ablation has proved its reliability for the synthesis of nano-particles and nano-structured materials, including metastable phases and complex stoichiometries. The possible nucleation of the nanoparticles in the gas phase and their growth has been little investigated, due to the difficulty of following the gas composition as well as the thermodynamic parameters. We show that such information can be obtained from the optically active plasma during its short lifetime, only a few microseconds for each laser pulse, as a result of a quick quenching due to the liquid environment. For this purpose, we follow the laser ablation of an alpha-Al2O3 target (corindon) in water, which leads to the synthesis of nanoparticles of gamma-Al2O3. The AlO blue-green emission and the Al1-2P0-2S doublet emission provide the electron density, the density ratio between the Al atoms and AlO molecules, and the rotational and vibrational temperatures of the AlO molecules. These diagnostic considerations are discussed in the framework of theoretical studies from the literature (density functional theory). We have found that starting from a hot atomized gas, the nucleation cannot occur in the first microseconds. We also raise the question of the influence of water on the control of the stoichiometry.
引用
收藏
页码:963 / 973
页数:11
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