PHONON-INDUCED NONMETAL-METAL TRANSITION OF A DOPED POLYANILINE

被引:61
作者
JOO, J
PRIGODIN, VN
MIN, YG
MACDIARMID, AG
EPSTEIN, AJ
机构
[1] MAX PLANCK INST FESTKORPERFORSCH,D-70506 STUTTGART,GERMANY
[2] UNIV PENN,DEPT CHEM,PHILADELPHIA,PA 19104
[3] OHIO STATE UNIV,DEPT CHEM,COLUMBUS,OH 43210
来源
PHYSICAL REVIEW B | 1994年 / 50卷 / 16期
关键词
D O I
10.1103/PhysRevB.50.12226
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We report the crossover for the microwave dielectric constant of camphor-sulfonic-acid-doped polyaniline prepared in m-cresol from very large room-temperature negative values to large positive ones with decreasing temperature below Ts∼20 K. We attribute this change to the transition from a phonon-controlled metallic state to a nonmetallic state with localized carriers and hopping transport below Ts. Electronically, one-dimensional chains that couple the three-dimensional crystalline regions are likely central for understanding the origin of this transition as weak localization. At T<Ts we also observed an increase in the thermoelectric power and a linear decrease in the reduced activation energy for dc conductivity. © 1994 The American Physical Society.
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收藏
页码:12226 / 12229
页数:4
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