Measurements of metal-polymer adhesion properties with dynamic force spectroscopy

We investigate nanoscale interface properties using dynamic mode atomic force microscopy (AFM) operated in the frequency modulation mode in ultrahigh vacuum. The AFM tip was was functionalised by a thin layer of aluminium and the polymer was treated by plasma-etching. In the spectroscopy mode we could measure the adhesion properties between the metal and the polymer surfaces. We found that plasma-etching of the polymer resulted in strongly enhanced force interactions, indicating a chemical activation of the polymer surface. Values for the adhesion force and work of adhesion were measured on the nanometer scale and are compared to conventional macroscopic adhesion failure tests.