Pure colloidal metal and ceramic nanoparticles from high-power picosecond laser ablation in water and acetone
Pure colloidal metal and ceramic nanoparticles from high-power picosecond laser ablation in water and acetone
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DOI：
10.1088/0957-4484/20/44/445603
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发表时间：
2009-11-04
期刊：
影响因子：
3.5
通讯作者：
Barcikowski, Stephan
中科院分区：
文献类型：
--
作者：
Baersch, Niko;Jakobi, Jurij;Barcikowski, Stephan
The generation of colloids by laser ablation of solids in a liquid offers a nearly unlimited material variety and a high purity as no chemical precursors are required. The use of novel high-power ultra-short-pulsed laser systems significantly increases the production rates even in inflammable organic solvents. By applying an average laser power of 50 W and pulse durations below 10 ps, up to 5 mg min(-1) of nanoparticles have been generated directly in acetone, marking a breakthrough in productivity of ultra-short-pulsed laser ablation in liquids. The produced colloids remain stable for more than six months. In the case of yttria-stabilized zirconia ceramic, the nanoparticles retain the tetragonal crystal structure of the ablated target. Laser beam self-focusing plays an important role, as a beam radius change of 2% on the liquid surface can lead to a decrease of nanoparticle production rates of 90% if the target position is not re-adjusted.
