Percolation conductivity in Langmuir-Blodgett multilayer films containing a long-chain TTF derivative

被引:5
|
作者
Pearson, C
Dhindsa, AS
Bryce, MR
Petty, MC
机构
[1] Univ Durham, Sch Engn, Durham DH1 3LE, England
[2] Univ Durham, Ctr Mol Elect, Durham DH1 3LE, England
[3] Univ Durham, Dept Chem, Durham DH1 3LE, England
来源
SUPRAMOLECULAR SCIENCE | 1997年 / 4卷 / 3-4期
基金
英国工程与自然科学研究理事会;
关键词
Langmuir-Blodgett films; tetrathiafulvalene; percolation conductivity;
D O I
10.1016/S0968-5677(97)00027-8
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The room-temperature DC in-plane electrical conductivity of multilayer Langmuir-Blodgett films of the long-chain tetrathiafulvalene (TTF) derivative octadecanoyl-TTF (ODTTF), mixed with either octadecanoic acid (OA) or pentacosa-10,12-diynoic acid (PA) and doped with iodine, has been measured with a standard two-probe technique. The conductivity was found to depend strongly on the proportion of fatty acid contained in the film, and this behaviour has been compared with that predicted by classical, two-site, two-dimensional (2D) and three-dimensional percolation theory. A percolation threshold corresponding to an ODTTF content of approximately 50% was observed in both cases, in agreement with the value obtained from the 2D model. For films diluted with OA, however, the conductivity transition was smeared out, suggesting a contribution by charge transport perpendicular to the plane of the substrate. Optical microscope studies of these multilayer films have provided further evidence of a two-phase structure. (C) 1997 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:443 / 447
页数:5
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