Analysis of thermal radiation from laser-heated nanoparticles formed by laser-induced decomposition of ferrocene

L. Landström, K. Elihn, M. Boman, C. G. Granqvist, P. Heszler

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Thermal radiation, originating from laser-heated gas-phase nanoparticles, was detected in the 400-700 nm wavelength range by means of optical emission spectroscopy. The particles were formed upon laser-induced photolytic decomposition of ferrocene (Fe(C5H5)2) and consisted of an iron core surrounded by a carbon shell. The laser-induced excitation was performed as the particles were still within the reactor zone, and the temperature of the particles could be determined from thermal emission. Both the temperature of the nanoparticles and the relative intensity changes of the emission were monitored as a function of time (with respect to the laser pulse), laser fluence and Ar ambient pressure. At high laser fluences, the particles reached high temperatures, and evidence was found for boiling of iron. Modeling of possible energy-releasing mechanisms such as black-body radiation, thermionic electron emission, evaporation and heat transfer by the ambient gas was also performed. The dominant cooling mechanisms at different ranges of temperature were clarified, together with a determination of the accommodation factor for the Ar-nanoparticle collisions. The strong evaporation at elevated temperatures also led to significant iron loss from the produced particles.

Original languageEnglish
Pages (from-to)827-833
Number of pages7
JournalApplied Physics A: Materials Science and Processing
Volume81
Issue number4
DOIs
Publication statusPublished - Sep 2005

Fingerprint

Heat radiation
thermal radiation
Nanoparticles
Decomposition
decomposition
nanoparticles
Lasers
Iron
lasers
Evaporation
iron
Temperature
fluence
Gas lasers
Optical emission spectroscopy
evaporation
black body radiation
Electron emission
temperature
thermionic emission

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy (miscellaneous)

Cite this

Analysis of thermal radiation from laser-heated nanoparticles formed by laser-induced decomposition of ferrocene. / Landström, L.; Elihn, K.; Boman, M.; Granqvist, C. G.; Heszler, P.

In: Applied Physics A: Materials Science and Processing, Vol. 81, No. 4, 09.2005, p. 827-833.

Research output: Contribution to journalArticle

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AB - Thermal radiation, originating from laser-heated gas-phase nanoparticles, was detected in the 400-700 nm wavelength range by means of optical emission spectroscopy. The particles were formed upon laser-induced photolytic decomposition of ferrocene (Fe(C5H5)2) and consisted of an iron core surrounded by a carbon shell. The laser-induced excitation was performed as the particles were still within the reactor zone, and the temperature of the particles could be determined from thermal emission. Both the temperature of the nanoparticles and the relative intensity changes of the emission were monitored as a function of time (with respect to the laser pulse), laser fluence and Ar ambient pressure. At high laser fluences, the particles reached high temperatures, and evidence was found for boiling of iron. Modeling of possible energy-releasing mechanisms such as black-body radiation, thermionic electron emission, evaporation and heat transfer by the ambient gas was also performed. The dominant cooling mechanisms at different ranges of temperature were clarified, together with a determination of the accommodation factor for the Ar-nanoparticle collisions. The strong evaporation at elevated temperatures also led to significant iron loss from the produced particles.

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