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With a view to measuring the adhesion of the microscopic metallic grains which constitute granular thin films, we have perfected a dynamic method. Very high accelerations (107 m/s2) are obtained by means of ultrasonic vibration amplifiers.
Investigation of the adhesion of granular silver films deposited on carbon provided very interesting results: the presence of a coalescence phenomenon shows that there are interactions between grains. The adhesion varies according to the size of the grains, and is very low (150 N/m2) compared with that of thick films (5.0 × 106 N/m2).
Finally, our measurement of the adhesion of thick films revealed that the break occurs in the silver very near the silver/carbon interface, and subsequent studies of the growth of silver/carbon show that the grains form on one or several monolayers of silver.
adhesion, thin films, granulation, adhesive face
Ingenieur au Centre National de la Recherche Scientifique Centre d'Etudes des Couches Minces, Laboratoire associe, C.N.R.S., Universite d'Aix-Marseille Ill, Marseille,