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Ejection-ionization of molecules from free standing graphene.
Stanislav V Verkhoturov1, Bartlomiej Czerwinski2, Dmitriy S Verkhoturov1
1Department of Chemistry, Texas A&M University, College Station, Texas 77843-3144, USA.
The Journal of Chemical Physics
|March 3, 2017
Summary
We report the first data on C60- emission from graphene impacted by C602+ ions. Molecular dynamics simulations reveal graphene membrane collective movement drives ejection, with electron tunneling facilitating ionization.
Area of Science:
- * Materials Science
- * Surface Science
- * Nanotechnology
Background:
- * Understanding molecular ion emission is crucial for surface analysis techniques.
- * Fullerenes (C60) are significant in materials science and nanotechnology.
- * Graphene's unique properties influence projectile-surface interactions.
Purpose of the Study:
- * To present the first experimental data on C60- emission from C60 on graphene.
- * To investigate the ejection and ionization mechanisms of C60 molecules.
- * To compare emission yields from graphene, bulk C60, and graphite.
Main Methods:
- * Experimental: Impact of 50 keV C602+ ions on C60/graphene system.
- * Experimental: Measurement of C60- emission yield in transmission direction.
- * Computational: Molecular dynamics simulations to elucidate ejection mechanisms.
Main Results:
- * Observed C60- emission yield of 1.7% from C60 on graphene.
- * Emission yields from bulk C60 and C60 on graphite were 3.7% and 3.3%, respectively.
- * Simulations indicated collective graphene membrane movement propels C60 ejection.
Conclusions:
- * Graphene's confined interaction volume alters ejection dynamics compared to bulk materials.
- * Collective motion of graphene and C60 molecules is key to ejection.
- * Proposed ionization mechanism involves electron tunneling from excited regions to ejecta.
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