By means of atomic force microscopy (AFM) the behavior of thin polymer films adsorbed on a graphite surface was investigated. Via force-distance curves, which were recorded for layers of polyisopren adsorbed on graphite (HOPG), a two layer system was found. The upper layer proved to be soft and not in the glass state. No indications supporting the supposition of an additional glass-like polyisopren layer underneath this soft layer could be found. Thus, if there exists such a glass layer on the HOPG surface, the upper limit of its thickness is set to 3 nm.
展开▼
