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Laser welding of transparent high performance polymer foils by using silver nanoparticles as absorption layer

: Neuber, M.; Heilmann, A.


Lu, Y.:
Laser-material interaction at micro/nanoscales : Symposium held April 25 - 29, 2011, San Francisco, California, U.S.A.; Collection of papers presented in Symposium TT: Laser-Material Interaction at Micro/Nanoscales, at the Spring 2011 Materials Research Society meeting
New York: Cambridge Univ. Press, 2012 (Materials Research Society Symposium Proceedings 1365)
ISBN: 978-1-605-11342-5
ISSN: 0272-9172
Symposium TT "Laser-Material Interaction at Micro/Nanoscales" <2011, San Francisco/Calif.>
Materials Research Society (Spring Meeting) <2011, San Francisco/Calif.>
Fraunhofer IWM ( IMWS) ()

Laser welding of transparent high performance polymer foils requires an additional absorption layer at the interface of both foils. This paper demonstrates that metallic nanoparticles, e.g. gold, silver or copper, can act as such an absorption layer. Silver nanoparticles were deposited on the surface of 200 m thick ethylene tetrafluoroethylene (ETFE) polymer foils by evaporation processes or by magnetron sputtering. For their additional mechanical stabilization, thin films produced by plasma polymerisation of hexamethyldisilazane or PTFE-polymer sputtering were deposited on top of the metal nanoparticles. Laser irradiation of the coated foil together with the untreated joining partner was performed by a continuous wave diode laser at a wavelength of 808 nm. With the defocused laser, the foils were welded and finally a nearly transparent welding seam was achieved. The nanostructure and the optical properties of the nanoparticle layer before laser irradiation were determi ned and compared with the nanostructure and the optical properties of the polymer metal nanocomposite after laser welding.