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Bundle structure formation on a polymer film at various temperatures and scanning velocities

Authors Wang, XP
Loy, MMT
Xiao, XD
Issue Date 2002
Source Nanotechnology , v. 13, (4), 2002, AUG, p. 478-483
Summary The structures formed by atomic force microscopic tip scanning on a 133 nm thick poly(tert-butyl acrylate) (PtBuA) film were examined at temperatures ranging from room temperature to 5 8 degreesC with various scanning velocities from I to 20 mum s(-1). It was observed that bumps were created at low temperatures and high scanning velocities. As the temperature was increased and the scanning velocity was decreased, bundles were produced through aggregation of the bumps. The width of the bundles was about 100 nm. As the temperature was further increased to higher than the glassy-rubbery phase transition temperature, T-g similar to 50 degreesC, of the PtBuA polymer, no bundle structures were formed at low scanning velocities. Our results clearly indicate that the formation of bumps and bundles occurs from the interplay of polymer peeling and relaxation. With polymer peeling taking place on soft polymer surfaces, slower relaxation favours the accumulation of polymer coil displacement and the formation of the bump and bundle structures, while fast relaxation results in the recovery of the polymer perturbation and no formation of surface structures.
ISSN 0957-4484
Rights Nanotechnology © Copyright (2002) IOP Publishing Ltd. The Journal's web site is located at
Language English
Format Article
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