Pressure effects on the resistivity of pristine and doped polyacetylene

We find that in this relatively highly conducting polymer the conducting mechanism is governed by variable range hopping

J.P. Ferraris; A.W. Webb; D.C. Weber; W.B. Fox; E.R. Carpenter; P. Brant

2003

Scholarcy highlights

  • Thermochromism of cast films of poly(3-hexylthiophene) and poly(3-dodecylthiophene) was studied by electronic absorption and FT-IR spectra
  • A possible mechanism for the transition is discussed from the viewpoint of conformational changes of the methylene side chains deduced from the FT-IR spectra
  • The absorption edge energy decreased with increasing pressure up to 3 GPa and showed leveling off and subsequent increase
  • The decrease is probably due to an increased conjugation length of the thiophene main chain caused by a compact packing of methylene side chains
  • With increasing side chain length, the pressure dependence increased and its maximum shifted to higher conductivity
  • From the pressure dependence of Mott's parameter, To, corrected for by compressibility data, the density of localized states at the Fermi level can be evaluated and has been found to increase by about 70% up to 1.5 GPa
  • We developed a new fluorescent sensor for Hg2+ based on the aggregation-induced emission of pyrazolopyridine-based coumarin chromophore
  • It was observed that the dynamic mesh method is greatly dependent on the regime of operation in the column and works only in the range of low voidage when the fluidized bed is homogeneous and does not contain liquid bubbles

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