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Title: Quasi-one dimensional electrical conductivity and thermoelectric power studies on a discotic liquid crystal
Authors: Balaguruswamy, V.S.K.
Prasad, Krishna S.
Chandrasekhar, S.
Kumar, Sandeep
Manickam, M.
Yelamaggad, C.V.
Keywords: Quasi-one dimensional conductivity
thermoelectric power
discotic liquid crystals
Issue Date: Jul-1999
Publisher: Indian Academy of Sciences
Citation: Pramana, 1999, Vol.53, p3-11
Abstract: We have studied the electrical conductivity of well aligned samples of hexahexylthiotriphenylene (HHTT) in the pure as well as doped states. The dopant used was a small concentration (0.62 mole %) of the electron acceptor trinitrofluorenone (TNF). In the columnar phases, doping causes the AC(1 kHz) conductivity along the columnar axis ( k) to increase by a factor of 107 or more relative to that in undoped samples; k attains a value of 10ÿ2S=m, which was the maximum measurable limit of our experimental set up. On the other hand, in the isotropic phase doping makes hardly any difference to the conductivity. The frequency dependence of the conductivity has been investigated. The DC conductivity of doped samples exhibits an enormous anisotropy, k= ? 1010, which is 7 orders higher than that reported for any liquid crystalline system, and, to our knowledge, the largest observed in an organic conductor. We also report the first thermoelectric power studies on these `molecular wires'. The sign of the thermoelectric power is in conformity with the expected nature of the charge carriers, namely, holes.
Description: Open Access
ISSN: 0304-4289
0973-7111 (Online)
Copyright: 1999 Indian Academy of Sciences
Appears in Collections:Research Papers (SCM)

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