For authors
Submission status

Archive (English)
   Volumes 21-40
   Volumes 1-20
   Volumes 41-62
      Volume 62
      Volume 61
      Volume 60
      Volume 59
      Volume 58
      Volume 57
      Volume 56
      Volume 55
      Volume 54
      Volume 53
      Volume 52
      Volume 51
      Volume 50
      Volume 49
      Volume 48
      Volume 47
      Volume 46
      Volume 45
      Volume 44
      Volume 43
      Volume 42
      Volume 41
VOLUME 58 (1993) | ISSUE 7 | PAGE 524
Scanning tunneling microscopy and spectroscopy of Langmuir-Blodgett films of ion-exchange polymers: 2D conductivity, resonant tunneling, and charge superstructure
Scanning tunneling microscopy and scanning tunneling spectroscopy (STM-STS) have been used to study monomolecular layers of an ion-exchange polymer. In a study of films containing an odd number of layers, an anomaly was found on the plot of dI/dV{ V): a conductance peak on the order of 150-200 mV wide near zero bias voltage. In addition, the results reveal a 3 X 2 surface reconstruction corresponding to a charge density wave and an oscillatory current-voltage characteristic. Generation of the feedback system of the microscope can arise in negative-slope regions on the current-voltage characteristic. The observed effects can be explained by noting that the density of states is determined by a superposition of effects stemming from the 2D nature of the conductance and a charge density wave.