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Excimer laser chemical ammonia patterning on PET film

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Abstract

Laser is a promising technique used for biopolymer surface modification with micro and/or nano features. In this work, a 193 nm excimer laser was used for poly (ethylene terephthalate) (PET) surfaces chemical patterning. The ablation threshold of the PET film used in the experiments was 62 mJ/cm2 measured before surface modification. Surface chemical patterning was performed by irradiating PET film in a vacuum chamber filled with ammonia at the flux of 10, 15, 20, 25 ml/min. Roughness of the surface characterized by profilometry showed that there were no significant observed change after modification comparing original film. But the hydrophilicity of the surface increased after patterning and a minimum water contact angle was obtained at the gas flux of 20 ml/min. FT-IR/ATR results showed the distinct amino absorption bands presented at 3352 cm−1and 1613 cm−1 after modification and XPS binding energies of C1s at 285.5 eV and N1s at 399.0 eV verified the existence of C–N bond formation on the PET film surface. Tof-SIMS ions mapping used to identify the amine containing fragments corroborates that amino grafting mainly happened inside the laser irradiation area of the PET surface. A hypothesized radical reaction mechanism proposes that the collision between radicals in ammonia and on the PET surface caused by the incident laser provokes the grafting of amino groups.

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Acknowledgements

This research was financial supported by the EU project: PROTEUS, INTERREG III A—SP1.P151/03, Spain project: BIOAVAN, PSE 300100-206 and NSFC project: 50403023. We appreciate Dr. Carmen Serra from CACTI of University of Vigo for Tof-SIMS and XPS, Yan Leping from South China University of Technology for FT-IR/ATR measurements.

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  1. Department of Applied Physics, University of Vigo, Rua Maxwell, Vigo, Spain

    G. Wu, M. D. Paz, S. Chiussi, J. Serra, P. González & B. Leon

  2. College of Material Science and Engineering, South China University of Technology, Guangzhou, China

    G. Wu & Y. J. Wang

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  1. G. Wu
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Wu, G., Paz, M.D., Chiussi, S. et al. Excimer laser chemical ammonia patterning on PET film. J Mater Sci: Mater Med 20, 597–606 (2009). https://doi.org/10.1007/s10856-008-3600-5

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