Relaxation of surface tracks on polycarbonate thin films induced by MeV heavy-ion impacts

In the present work, the relaxation behavior of nanometer-sized deformations produced by single ion impacts on the surface of monodisperse ( M w = 60,000 u) polycarbonate thin films was investigated at temperatures close to and below the glass transition. The relaxation functions for the length, hei...

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Bibliographic Details
Published in:Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms Beam interactions with materials and atoms, 2010-10, Vol.268 (19), p.3080-3083
Main Authors: Leal, R., Souza, C.T., da Silva, M.R., Fakhraai, Z., Forrest, J.A., Papaléo, R.M.
Format: Article
Language:English
Subjects:
Beam interactions
Cratering
Deformation
Glass transition
Ion impact
Ion tracks
Law
Polycarbonate
Polycarbonates
Polymers
Relaxation
Relaxation time
Temperature dependence
Thin films
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Summary:In the present work, the relaxation behavior of nanometer-sized deformations produced by single ion impacts on the surface of monodisperse ( M w = 60,000 u) polycarbonate thin films was investigated at temperatures close to and below the glass transition. The relaxation functions for the length, height and width of the deformations were well described by a stretched exponential law, with characteristic relaxation times τ strongly dependent on temperature. For T > 100 °C, the temperature dependence of τ obeys a Vogel–Fulcher law, but for lower temperatures it becomes less steep and tends to an Arrhenius-type behavior.
ISSN:0168-583X
1872-9584
DOI:10.1016/j.nimb.2010.05.048