Confinement effects of ion tracks in ultrathin polymer films

We show direct experimental evidence that radiation effects produced by single MeV heavy ions on a polymer surface are weakened when the length of the ion track in the material is confined into layers of a few tens of nanometers. Deviation from the bulk (thick film) behavior of ion-induced craters s...

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Bibliographic Details
Published in:Physical review letters 2015-03, Vol.114 (11), p.118302-118302, Article 118302
Main Authors: Papaléo, R M, Thomaz, R, Gutierres, L I, de Menezes, V M, Severin, D, Trautmann, C, Tramontina, D, Bringa, E M, Grande, P L
Format: Article
Language:English
Subjects:
Computer simulation
Confinement
Deviation
Heavy Ions
Mathematical analysis
Models, Chemical
Molecular dynamics
Molecular Dynamics Simulation
Nanostructure
Polymeric films
Polymethyl Methacrylate - chemistry
Thick films
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Summary:We show direct experimental evidence that radiation effects produced by single MeV heavy ions on a polymer surface are weakened when the length of the ion track in the material is confined into layers of a few tens of nanometers. Deviation from the bulk (thick film) behavior of ion-induced craters starts at a critical thickness as large as ∼40  nm, due to suppression of long-range additive effects of excited atoms along the track. Good agreement was found between the experimental results, molecular dynamic simulations, and an analytical model.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.114.118302