Stopping of energetic cobalt clusters and formation of radiation damage in graphite

Vladimir Popok, Sasa Vuckovic, Juha Samela, Tommi T. Jarvi, Kai Nordlund

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Abstract

The interaction of energetic (up to 200 eV/atom) size-selected Co
clusters with HOPG is studied both experimentally and theoretically. Etching of the radiation damaged areas introduced by cluster impacts provides a measure of the depth to which the collision cascades are developed and allows a comparison of these data with the molecular dynamics simulations. Good agreement between the experimental results and modeling is obtained. It is shown that the projected range of the cluster constituents can be linearly scaled with the projected momentum (the cluster momentum divided by surface impact area). With decrease in cluster energies to ca. 10 eV/atom the transition from implantation to pinning is suggested. It is found that even after quite energetic impacts residual clusters remain intact in the shallow graphite layer. These clusters can catalyze reaction of atmospheric oxygen with damaged graphite areas under the thermal heating that leads to the formation of narrow (5–15 nm)
random in shape surface channels (trenches) in the top few graphene layers.
Thus, small imbedded Co nanoparticles can be used as a processing tool for graphene.
Original languageEnglish
Article number205419
JournalPhysical Review B (Condensed Matter and Materials Physics)
Volume80
Issue number20
Number of pages12
ISSN1098-0121
DOIs
Publication statusPublished - 19 Nov 2009
Externally publishedYes

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Radiation damage
Cobalt
radiation damage
stopping
Graphene
Momentum
cobalt
graphite
Atoms
Ion implantation
Molecular dynamics
Etching
Nanoparticles
Radiation
Heating
Oxygen
graphene
Computer simulation
Processing

Cite this

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title = "Stopping of energetic cobalt clusters and formation of radiation damage in graphite",
abstract = "The interaction of energetic (up to 200 eV/atom) size-selected Coclusters with HOPG is studied both experimentally and theoretically. Etching of the radiation damaged areas introduced by cluster impacts provides a measure of the depth to which the collision cascades are developed and allows a comparison of these data with the molecular dynamics simulations. Good agreement between the experimental results and modeling is obtained. It is shown that the projected range of the cluster constituents can be linearly scaled with the projected momentum (the cluster momentum divided by surface impact area). With decrease in cluster energies to ca. 10 eV/atom the transition from implantation to pinning is suggested. It is found that even after quite energetic impacts residual clusters remain intact in the shallow graphite layer. These clusters can catalyze reaction of atmospheric oxygen with damaged graphite areas under the thermal heating that leads to the formation of narrow (5–15 nm)random in shape surface channels (trenches) in the top few graphene layers.Thus, small imbedded Co nanoparticles can be used as a processing tool for graphene.",
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Stopping of energetic cobalt clusters and formation of radiation damage in graphite. / Popok, Vladimir; Vuckovic, Sasa; Samela, Juha; Jarvi, Tommi T.; Nordlund, Kai.

In: Physical Review B (Condensed Matter and Materials Physics), Vol. 80, No. 20, 205419, 19.11.2009.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Stopping of energetic cobalt clusters and formation of radiation damage in graphite

AU - Popok, Vladimir

AU - Vuckovic, Sasa

AU - Samela, Juha

AU - Jarvi, Tommi T.

AU - Nordlund, Kai

PY - 2009/11/19

Y1 - 2009/11/19

N2 - The interaction of energetic (up to 200 eV/atom) size-selected Coclusters with HOPG is studied both experimentally and theoretically. Etching of the radiation damaged areas introduced by cluster impacts provides a measure of the depth to which the collision cascades are developed and allows a comparison of these data with the molecular dynamics simulations. Good agreement between the experimental results and modeling is obtained. It is shown that the projected range of the cluster constituents can be linearly scaled with the projected momentum (the cluster momentum divided by surface impact area). With decrease in cluster energies to ca. 10 eV/atom the transition from implantation to pinning is suggested. It is found that even after quite energetic impacts residual clusters remain intact in the shallow graphite layer. These clusters can catalyze reaction of atmospheric oxygen with damaged graphite areas under the thermal heating that leads to the formation of narrow (5–15 nm)random in shape surface channels (trenches) in the top few graphene layers.Thus, small imbedded Co nanoparticles can be used as a processing tool for graphene.

AB - The interaction of energetic (up to 200 eV/atom) size-selected Coclusters with HOPG is studied both experimentally and theoretically. Etching of the radiation damaged areas introduced by cluster impacts provides a measure of the depth to which the collision cascades are developed and allows a comparison of these data with the molecular dynamics simulations. Good agreement between the experimental results and modeling is obtained. It is shown that the projected range of the cluster constituents can be linearly scaled with the projected momentum (the cluster momentum divided by surface impact area). With decrease in cluster energies to ca. 10 eV/atom the transition from implantation to pinning is suggested. It is found that even after quite energetic impacts residual clusters remain intact in the shallow graphite layer. These clusters can catalyze reaction of atmospheric oxygen with damaged graphite areas under the thermal heating that leads to the formation of narrow (5–15 nm)random in shape surface channels (trenches) in the top few graphene layers.Thus, small imbedded Co nanoparticles can be used as a processing tool for graphene.

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