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Applied Physics Letters / Volume 91 / Issue 8 / NANOSCALE SCIENCE AND DESIGN
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Appl. Phys. Lett. 91, 083113 (2007); http://dx.doi.org/10.1063/1.2773937 (3 pages)

Generation of nanoparticle colloids by picosecond and femtosecond laser ablations in liquid flow

Stephan Barcikowski1, Ana Menéndez-Manjón1, Boris Chichkov1, Marijus Brikas2, and Gediminas Račiukaitis2

1Laser Zentrum Hannover e.V., Hollerithallee 8, D-30419 Hannover, Germany
2Institute of Physics, Savanoriu Ave. 231, LT-02300 Vilnius, Lithuania and Ekspla Ltd., Savanoriu Ave. 231, LT-02300 Vilnius, Lithuania

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(Received 8 March 2007; accepted 31 July 2007; published online 23 August 2007)

Fabrication of silver nanoparticle colloids using ultrashort pulse laser ablation in water is studied. Ablation in liquid flow improves the reproducibility and increases the nanoparticle productivity by 380% compared to stationary liquid. Femtosecond laser ablation in water is 20% more efficient than picosecond laser ablation, but due to higher picosecond laser power (higher repetition rate), the nanoparticle productivity at the same pulse fluence is three times higher for picosecond laser ablation. With picosecond laser pulses, the maximum productivity of 8.6 μg/s is achieved at a pulse energy of 110 μJ and repetition rate of 50 kHz.

© 2007 American Institute of Physics

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KEYWORDS and PACS

Keywords

colloids, high-speed optical techniques, nanoparticles, nanotechnology, pulsed laser deposition, silver

PACS

  • 81.16.Mk

    Laser-assisted deposition

  • 81.15.Fg

    Pulsed laser ablation deposition

  • 42.65.Re

    Ultrafast processes; optical pulse generation and pulse compression

  • 82.70.Dd

    Colloids

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2773937

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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Figures (click on thumbnails to view enlargements)

FIG.1
Ablated line geometries on silver samples produced by picosecond laser pulses (5.5 W, 50 kHz, 20 repetitions per line) in stationary [(a) and (b)] and flowing liquids (c). In all cases, the liquid vessel is moved linear at a constant speed of 0.5 mm/s.

FIG.1 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.2
Constructional drawing of the stirred bypass flow cell.

FIG.2 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.3
Linewidths produced by 5.5 W picosecond laser ablation of silver sample in de-ionized water at constant pulse overlap (1 mm/s, at 100 kHz) and (0.5 mm/s and 50 kHz). Circular symbols correspond to ablation in stationary liquid; squares and triangles represent results obtained in flow cell.

FIG.3 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.4
Silver nanoparticle production rate at 5.5 W as a function of focus position determined in air.

FIG.4 Download High Resolution Image (.zip file) | Export Figure to PowerPoint

FIG.5
TEM images (made at the Hannover Centre for Production Technology) and corresponding size distributions (histograms) of silver nanoparticles produced by picosecond pulses (a) and femtosecond pulses [(b) and (c)] generated in the flow cell. Triangles show distributions obtainded by velocimetry technique. Focus diameter (ablation crater after 31 s); 136 μm for 100 μJ/pulse (a), 218 μm for 290 μJ/pulse (b), and 182 μm for 376 μJ/pulse (c).

FIG.5 Download High Resolution Image (.zip file) | Export Figure to PowerPoint



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