Fullerenes,Nanotubes, and Graphite as Matrices for Collision Mechanism in Secondary Ion Mass Spectrometry: Determination of Cyclodextrin |
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Authors: | Monika Stupavska Monika Jerigova Miroslav Michalka Daniel Hasko Vojtech Szoecs Dusan Velic |
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Institution: | (1) Department of Physical and Theoretical Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynska dolina, 842 15 Bratislava, Slovakia;(2) International Laser Center, Ilkovicova 3, 841 04 Bratislava, Slovakia;(3) Institute of Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynska dolina, 842 15 Bratislava, Slovakia |
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Abstract: | A technique for improving the sensitivity of high mass molecular analysis is described. Three carbon species, fullerenes,
single walled carbon nanotubes, and highly ordered pyrolytic graphite are introduced as matrices for the secondary ion mass
spectrometry analysis of cyclodextrin (C42H70O35, 1134 u). The fullerene and nanotubes are deposited as single deposition, and 10, 20, or 30 deposition films and cyclodextrin
is deposited on top. The cyclodextrin parent-like ions and two fragments were analyzed. A 30 deposition fullerene film enhanced
the intensity of cationized cyclodextrin with Na by a factor of 37. While the C6H11O5 fragment, corresponding to one glucopyranose unit, increased by a factor of 16. Although fragmentation on fullerene is not
suppressed, the intensity is twice as low as the parent-like ion. Deprotonated cyclodextrin increases by 100× and its C8H7O fragment by 10×. While the fullerene matrix enhances secondary ion emission, the nanotubes matrix film generates a basically
constant yield. Graphite gives rise to lower intensity peaks than either fullerene or nanotubes. Scanning electron microscopy
and atomic force microscopy provide images of the fullerene and nanotubes deposition films revealing flat and web structured
surfaces, respectively. A “colliding ball” model is presented to provide a plausible physical mechanism of parent-like ion
enhancement using the fullerene matrix. |
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