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Physical properties and structure of thin conducting ion-beam modified polymer films

: Günther, M.; Gerlach, G.; Suchanek, G.; Schneider, D.; Wolf, B.; Deineka, A.; Jastrabik, L.


Macromolecular symposia 212 (2004), Nr.1, S.245-250
ISSN: 0258-0322
ISSN: 1022-1360
Fraunhofer IWS ()

In this work, a complex investigation of the film surface composition, chemical bonding, conductivity, optical properties, density, hardness and Young's modulus of ion-beam-modified polyimide films was carried out. It was shown that the partial destruction of chemical bonding under ion bombardment leads to the formation of graphite-like, amorphous carbon islands, which increase the surface film conductivity by several orders of magnitude, from an insulating to a semiconducting region. Strong enhancements of both the conductivity and the optical absorption coefficient occur when the fraction of amorphous carbon clusters dispersed in a polyimide matrix reaches 40 %. The values of hardness, Young's modulus and density at high irradiation doses reach the values typical of a hydrogenated amorphous carbon.