DOPING AND TEMPERATURE-DEPENDENCE OF ANISOTROPIC CONDUCTIVITY IN NEW POLYACETYLENE

被引:15
作者
AHMED, MT
KAISER, AB
ROTH, S
MIGAHED, MD
机构
[1] MANSOURA UNIV,FAC SCI,DEPT PHYS,MANSOURA,EGYPT
[2] VICTORIA UNIV WELLINGTON,DEPT PHYS,WELLINGTON,NEW ZEALAND
关键词
D O I
10.1088/0022-3727/25/1/011
中图分类号
O59 [应用物理学];
学科分类号
摘要
We report on measurements of the conductivity of 'new' polyacetylene as a function of temperature for iodine and halide doping, for different dopant concentrations and for stretched and unstretched samples. The temperature dependence of conductivity in highly-doped stretched samples is remarkably similar parallel and perpendicular to the stretch direction, despite a difference in conductivity magnitudes by a factor of about 50. In particular, a maximum in the conductivity below room temperature (for AsF5 doping) is seen for the first time in the perpendicular as well as the parallel direction. The temperature dependence of the conductivity for the highly-doped stretched samples is in good agreement with a model of quasi-one-dimensional conduction combined with fluctuation-induced tunnelling through thin 'barriers' (for example chain defects). For unstretched samples, a model involving tunnelling between metallic islands gives a better description of the data.
引用
收藏
页码:79 / 82
页数:4
相关论文
共 19 条
  • [1] AHMED MT, 1991, ELECTRONIC PROPERTIE, V4
  • [2] SYNTHESIS OF POLYACETYLENE FILMS WITH HIGH-DENSITY AND HIGH MECHANICAL STRENGTH
    AKAGI, K
    SUEZAKI, M
    SHIRAKAWA, H
    KYOTANI, H
    SHIMOMURA, M
    TANABE, Y
    [J]. SYNTHETIC METALS, 1989, 28 (03) : D1 - D10
  • [3] SOLITONS IN CONDUCTING POLYMERS
    HEEGER, AJ
    KIVELSON, S
    SCHRIEFFER, JR
    SU, WP
    [J]. REVIEWS OF MODERN PHYSICS, 1988, 60 (03) : 781 - 850
  • [4] TEMPERATURE-DEPENDENCE OF CONDUCTIVITY IN METALLIC POLYACETYLENE
    KAISER, AB
    GRAHAM, SC
    [J]. SYNTHETIC METALS, 1990, 36 (03) : 367 - 380
  • [5] KAISER AB, IN PRESS SYNTH METAL, V45
  • [6] KAISER AB, 1991, ELECTRONIC PROPERTIE, V4
  • [7] INTRINSIC CONDUCTIVITY OF CONDUCTING POLYMERS
    KIVELSON, S
    HEEGER, AJ
    [J]. SYNTHETIC METALS, 1988, 22 (04) : 371 - 384
  • [8] NEW PROCESS FOR THE PRODUCTION OF METAL-LIKE, STABLE POLYACETYLENE
    NAARMANN, H
    THEOPHILOU, N
    [J]. SYNTHETIC METALS, 1987, 22 (01) : 1 - 8
  • [9] A NOVEL BARRIER MODEL FOR FLUCTUATION-INDUCED TUNNELING IN HIGHLY CONDUCTIVE POLYACETYLENE
    PAASCH, G
    LEHMANN, G
    WUCKEL, L
    [J]. SYNTHETIC METALS, 1990, 37 (1-3) : 23 - 32
  • [10] ELECTRICAL-CONDUCTIVITY OF HIGHLY-ORIENTED-POLYACETYLENE
    PARK, YW
    PARK, C
    LEE, YS
    YOON, CO
    SHIRAKAWA, H
    SUEZAKI, Y
    AKAGI, K
    [J]. SOLID STATE COMMUNICATIONS, 1988, 65 (02) : 147 - 150