Emission spectroscopy and size distribution of gas phase nanoparticles generated by laser-based methods

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Tungsten and iron/carbon composite nanoparticles were generated via ArF excimer laser-assisted CVD from WF6/H2/Ar gas mixture and photolytic decomposition of ferrocene (Fe(C5H5)2), respectively. Time-resolved spectroscopic measurements were performed and the emitted black-body-like radiation from these particles, due to the laser heating, was analyzed determining the temperature of the particles. Dominant cooling processes as evaporation and heat transfer by the ambient gases were identified; thermionic emission and black-body-like radiation were found to be negligible. Melting of tungsten and boiling of iron nanoparticles were observed. The size distributions of the particles were found lognormal and it was explained by the residence time approach model, functioning at the limit with no coagulation of the particles. Amorphous carbon nanoparticles were formed via laser ablation of a highly oriented pyrolytic graphite target at 193nm excimer laser wavelength in N2 atmosphere at normal pressure. The size distribution of the particles was in situ monitored by a differential mobility analyzer in the size-window of 7-130nm. Change of size distributions was monitored as the laser fluence was varied. The observed effects are discussed and related to the ablation dynamics. Compositional and structural examinations of deposited particle-films were performed by Raman spectroscopy, X-ray and electron diffraction techniques.

Original languageEnglish
Pages (from-to)538-545
Number of pages8
JournalApplied Surface Science
Volume186
Issue number1-4
DOIs
Publication statusPublished - Jan 28 2002

Fingerprint

Emission spectroscopy
Tungsten
Gases
Excimer lasers
vapor phases
Nanoparticles
nanoparticles
Lasers
Iron
spectroscopy
black body radiation
lasers
Radiation
Thermionic emission
Laser heating
Graphite
Amorphous carbon
Laser ablation
Ablation
Coagulation

Keywords

  • Emission spectroscopy
  • Laser ablation
  • Nanoparticles
  • Thermal radiation

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Condensed Matter Physics

Cite this

Emission spectroscopy and size distribution of gas phase nanoparticles generated by laser-based methods. / Heszler, P.

In: Applied Surface Science, Vol. 186, No. 1-4, 28.01.2002, p. 538-545.

Research output: Contribution to journalArticle

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