CONDUCTIVITY AND STRUCTURE OF A LIQUID-CRYSTALLINE ORGANIC CONDUCTOR

被引:66
作者
VAUGHAN, GBM
HEINEY, PA
MCCAULEY, JP
SMITH, AB
机构
[1] UNIV PENN, RES STRUCT MATTER LAB, PHILADELPHIA, PA 19104 USA
[2] UNIV PENN, DEPT CHEM, PHILADELPHIA, PA 19104 USA
关键词
D O I
10.1103/PhysRevB.46.2787
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We have measured the dc conductivity and lattice parameters of hexa(hexylthio)triphenylene (HHTT) saturation doped by exposure to iodine vapor, using a four-probe resistivity technique and powder x-ray diffraction. The compound was further characterized by differential scanning calorimetry, thermogravimetric analysis, and polarizing microscopy. Pure HHTT is an insulator, and displays monoclinic crystal (K), incommensurate helical (H), columnar liquid crystal (D(hd)), and isotropic liquid (I) phases. The iodine-doped compound retains the K, D(hd), and I phases, but the H phase is suppressed. In addition, the conductivity rises 4-5 orders of magnitude after doping, so that the iodine-HHTT complex has a powder conductivity characteristic of a semiconducting radical-ion salt.
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页码:2787 / 2791
页数:5
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