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VOLUME 62 (1995) | ISSUE 6 | PAGE 506
Scanning tunneling microscopy and spectroscopy of low-dimension systems: Molecular films of an ion-exchange polymer
The results of an experimental study of the electronic properties of Langmuir-Blodgett films of an ion-exchange polymer, performed by the methods of scanning tunneling microscopy and spectroscopy (STM-STS), are presented. Ordered regions with dimensions of ~ 1000 A and a dI/dV(V) curve with a conductance peak near the zero bias voltage were found. For this case the shape of the curve dIldV(V) was found to depend on the period of the ordered structure. In the case where there was no ordering on the surface of the film, splitting of the conductance peak on the curve dI/dV(V) was observed near zero bias voltage. An additional energy gap with a width of ~ 40 meV appeared. A model is proposed to explain these effects. © 1995 American Institute of Physics.