Electron Paramagnetic Resonance Saturation Characteristics of Pristine and Doped Polyacetylenes.

Abstract

Electron paramagnetic resonance saturation experiments have been carried out on undoped polyacetylene and in the doped polymer as a function of dopant concentration. The relaxation times of undoped trans- (CH)x show considerable variability from sample, T1 = (2.7 + or - 1.7) x 10 to the -5 sec and T2=(7.8 + or - 1.0) x 10 to the -8 sec suggesting sensitivity to trace impurities. Exposure to air reduces T1 to 8.1 x 10 to the -6 sec and T2 to 6.6 x 10 to the -8 sec; this effect is reversible. Using radio-assay techniques with 125 sub I, it was possible to prepare and characterize samples of known dopant concentration at the level of parts per million (ppm). There are three distinct regimes which characterize the effect of iodine concentration on the EPR characteristics of trans-(CHIy)x.

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Document Details

Document Type
Technical Report
Publication Date
Nov 11, 1981
Accession Number
ADA107716

Entities

People

  • Frank E Karasz
  • Gary E Wnek
  • James C. W. Chien
  • John M. Warakomski
  • L. Charles Dickinson

Organizations

  • University of Massachusetts Amherst

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Alkynes
  • Charge Carriers
  • Chemistry
  • Conductive Polymers
  • Crystal Structure
  • Distortion
  • Electron Paramagnetic Resonance
  • Magnetic Resonance
  • Materials
  • Military Research
  • Molecules
  • Paramagnetic Resonance
  • Polymers
  • Relaxation Time
  • Resonance
  • Spin-Orbit Interaction
  • Subatomic Particles

Readers

  • Materials Science and Engineering.

Technology Areas

  • Microelectronics