Application of laser-induced incandescence to the detection of carbon nanotubes and carbon nanofibers

Randy Lee Vander Wal, Gordon M. Berger, Thomas M. Ticich, Premal D. Patel

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

Laser-induced incandescence applied to a heterogeneous, multielement reacting flow is characterized by temporally resolved emission spectra, time-resolved emission at selected detection wavelengths, and fluence dependence. Two-pulse laser measurements are used to further probe the effects of laserinduced changes on the optical signal. Laser fluences above 0.6 J/cm2at 1064 nm initiate laser-induced vaporization, yielding a lower incandescence intensity, as found through fluence-dependence measurements. Spectrally derived temperatures show that values of excitation laser fluence greater than this value lead to superheated plasmas with temperatures well above the vaporization point of carbon. The temporal evolution of the emission signal at these fluences is consistent with plasma dissipation processes, not incandescence from solidlike structures. Two-pulse laser experiments reveal that other material changes are produced at fluences below the apparent vaporization threshold, leading to nanostructures with different optical and thermal properties.

Original languageEnglish (US)
Pages (from-to)5678-5690
Number of pages13
JournalApplied Optics
Volume41
Issue number27
DOIs
StatePublished - Sep 10 2002

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All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering

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