Formation and emission spectroscopy of laser-generated nanoparticles

P. Heszler, K. Elihn, L. Landström, M. Boman

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Fe nanoparticles, with both fcc and bcc structures and with a C shell that protects against oxidation, were generated by the laser-assisted photolytic chemical vapor decomposition of ferrocene (FeCp2). Amorphous W and WN0,3 nanoparticles were formed by laser ablation (LA) of solid W in Ar and in N2 ambient, respectively. Laser-assisted chemical vapor deposition of W yielded crystalline W nanoparticles (β phase) from a WF6/H2/Ar gas mixture. ArF excimer laser was used as the radiation source in all the experiments. Measurements and analysis of the emitted blackbody-like radiation from the laser heated particles were performed and dominant cooling processes such as evaporation and heat transfer by the ambient gases were identified. The particles could be heated up to the boiling and melting point of Fe and W, respectively. Lognormal particle size distributions were found for Fe/C and W nanoparticles generated by vapor decomposition or deposition processes respectively, and then modeled at low panicle concentration (with no coagulation). The thickness of the C shell was practically independent of the laser fluence, while the size of the Fe core could be varied for the Fe/C particles. The LA yielded no lognormal-type distribution for the amorphous WN0,3 particles.

Original languageEnglish
Pages (from-to)631-639
Number of pages9
JournalSmart Materials and Structures
Volume11
Issue number5
DOIs
Publication statusPublished - Oct 2002

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Emission spectroscopy
Nanoparticles
nanoparticles
Lasers
Laser ablation
spectroscopy
laser ablation
lasers
Vapors
vapors
Decomposition
decomposition
Radiation
Boiling point
Excimer lasers
coagulation
Coagulation
radiation sources
particle size distribution
Gas mixtures

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Formation and emission spectroscopy of laser-generated nanoparticles. / Heszler, P.; Elihn, K.; Landström, L.; Boman, M.

In: Smart Materials and Structures, Vol. 11, No. 5, 10.2002, p. 631-639.

Research output: Contribution to journalArticle

Heszler, P. ; Elihn, K. ; Landström, L. ; Boman, M. / Formation and emission spectroscopy of laser-generated nanoparticles. In: Smart Materials and Structures. 2002 ; Vol. 11, No. 5. pp. 631-639.
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