HIGH-RESOLUTION HEIGHT-PROFILE ANALYSIS AND LASER-IONIZATION CHARACTERIZATION OF A WIDE RANGE OF FULLERENES IN LAMINAR DIFFUSION FLAMES

K. Siegmann, H. Hepp and K. Sattler
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K. Siegmann: Federal Institute of Technology (ETH), Laboratory for Solid State Physics, CH-8093 Zürich, Switzerland
H. Hepp: Federal Institute of Technology (ETH), Laboratory for Solid State Physics, CH-8093 Zürich, Switzerland
K. Sattler: University of Hawaii, Department of Physics and Astronomy, Watanabe Hall/2505 Correa Road, Honolulu, HI 96822, USA

Surface Review and Letters (SRL), 1996, vol. 03, issue 01, 741-745

Abstract: Neutral fullerenes are detected online in laminar, atmospheric pressure methane diffusion flames using time-of-flight mass spectrometry combined with laser ionization. The intensity of theC60signal shows a quadratic dependence of the laser-pulse energy, which is consistent with two-photon ionization. Poly-cyclic aromatic hydrocarbons (PAH) are also found in these flames. Height profiles of fullerenes are compared with height profiles of PAH and it is found that the concentration of fullerenes most strongly at a height where the concentration of PAH decreases the most. This height in the flame probably marks the burnout of the available hydrogen. Since all fullerenes, independent of their number of carbons, peak at the same height above burner, we conclude that fullerenes in flames do not grow by the addition of small molecules.

Date: 1996
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DOI: 10.1142/S0218625X96001339

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