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Proceedings Paper

Formation and emission spectroscopy of laser-generated nanoparticles
Author(s): Peter Heszler; Karine Elihn; Lars Landstrom; Mats Boman
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Paper Abstract

Iron nanoparticles, with both fcc and bcc structure and with a protective carbon shell against oxidation, were generated by laser-assisted photolytic chemical vapor decomposition of ferrocene (FeCp2). Amorphous W and WN0,3 nanoparticles were formed by laser ablation of solid W in Ar and in N2 ambient, respectively. Laser-assisted chemical vapor deposition of W yielded crystalline tungsten nanoparticles (b phase) from WF6H2/Ar gas mixture. ArF excimer laser was used as radiation source for all the experiments. Measurements and analysis of the emitted blackbody-like radiation from the laser heated particles were performed, dominant cooling processes as evaporation and heat transfer by the ambient gases were identified. The particles could be heated up to the boiling and melting point of iron and tungsten, respectively. Lognormal particle size-distributions were found for Fe/C and W nanoparticles generated by vapor decomposition or deposition processes respectively, furthermore modeled at low particle concentration (with no coagulation) limit. The thickness of the carbon shell was practically independent on the laser fluence, while the size of the iron core could be varied with it for the Fe/C particles. The laser ablation yielded no lognormal type of distribution for the amorphous WN0,3 particles.

Paper Details

Date Published: 19 November 2001
PDF: 12 pages
Proc. SPIE 4590, BioMEMS and Smart Nanostructures, (19 November 2001); doi: 10.1117/12.454612
Show Author Affiliations
Peter Heszler, Uppsala Univ. (Sweden)
Karine Elihn, Uppsala Univ. (Sweden)
Lars Landstrom, Uppsala Univ. (Sweden)
Mats Boman, Uppsala Univ. (Sweden)

Published in SPIE Proceedings Vol. 4590:
BioMEMS and Smart Nanostructures
Laszlo B. Kish; Erol C. Harvey; William B. Spillman, Editor(s)

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