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Changes in wetting and contact charge transfer by femtosecond laser-ablation of polyimide

•Laser ablation significantly reduced the triboelectric charging of polyimide films.•Hierarchical micro/nanostructures formed on the surface of the sample.•Structural anisotropy leads to spatially varying contact angles of water droplets.•Raman spectroscopy revealed a carbonization of the polyimide...

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Bibliographic Details
Published in:Applied surface science 2015-09, Vol.349, p.952-956
Main Authors: Guo, X.D., Dai, Y., Gong, M., Qu, Y.G., Helseth, L.E.
Format: Article
Language:English
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Summary:•Laser ablation significantly reduced the triboelectric charging of polyimide films.•Hierarchical micro/nanostructures formed on the surface of the sample.•Structural anisotropy leads to spatially varying contact angles of water droplets.•Raman spectroscopy revealed a carbonization of the polyimide sample.•The corresponding loss of insulation may explain the reduction of charge transfer. In this study it is demonstrated that the triboelectric charging of polyimide thin films is significantly reduced by using a femtosecond laser to nanostructure its. It is found that the contact charge transfer between laser-ablated Kapton and aluminum is almost negligible, and even much lower than the significant current occurring when non-treated Kapton touches the metal. Scanning electron microscopy demonstrates that laser ablation produces a hierarchical micro and nanostructure, and it is found that the structural anisotropy leads to spatially varying contact angles of water droplets residing on the surface. Raman spectra suggest that the centers of the laser-ablated tracks are carbonized; therefore, the loss of insulation can be responsible for the reduction of charge transfer.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2015.05.089