Metallic transport in polyaniline

被引:800
作者
Lee, K [1 ]
Cho, S
Park, SH
Heeger, AJ
Lee, CW
Lee, SH
机构
[1] Pusan Natl Univ, Dept Phys, Pusan 609735, South Korea
[2] Univ Calif Santa Barbara, Ctr Polymers & Organ Solids, Santa Barbara, CA 93106 USA
[3] Ajou Univ, Dept Mol Sci & Technol, Suwon 442749, South Korea
关键词
D O I
10.1038/nature04705
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Despite nearly three decades of materials development, the transport properties in the 'metallic state' of the so-called conducting polymers are still not typical of conventional metals(1-7). The hallmark of metallic resistivity-a monotonic decrease in resistivity with temperature-has not been obtained at temperatures over the full range below room temperature; and a frequency dependent conductivity, sigma(omega), typical of metals has also not been observed. In contrast, the low-temperature behaviour of 'metallic' polymers has, in all previous cases, exhibited an increase in resistivity as temperature is further decreased, as a result of disorder-induced localization of the charge carriers(1-4). This disorder-induced localization also changes the infrared response such that sigma(omega) deviates from the prediction of Drude theory(5-7). Here we report classic metallic transport data obtained from truly metallic polymers. With polyaniline samples prepared using self-stabilized dispersion polymerization(8), we find that for samples having room-temperature conductivities in excess of 1,000 S cm(-1), the resistivity decreases monotonically as the temperature is lowered down to 5 K, and that the infrared spectra are characteristic of the conventional Drude model even at the lowest frequencies measured.
引用
收藏
页码:65 / 68
页数:4
相关论文
共 30 条
[21]  
Mott N.F., 1990, METAL INSULATOR TRAN
[22]   Metallic temperature dependence of resistivity in perchlorate doped polyacetylene [J].
Park, YW ;
Choi, ES ;
Suh, DS .
SYNTHETIC METALS, 1998, 96 (01) :81-86
[23]  
PINES ID, 1966, THEORY QUANTUM LIQUI
[24]   COUNTERION-INDUCED PROCESSIBILITY OF POLYANILINE - TRANSPORT AT THE METAL-INSULATOR BOUNDARY [J].
REGHU, M ;
CAO, Y ;
MOSES, D ;
HEEGER, AJ .
PHYSICAL REVIEW B, 1993, 47 (04) :1758-1764
[25]   Doping-dependent studies of the Anderson-Mott localization in polyaniline at the metal-insulator boundary [J].
Tzamalis, G ;
Zaidi, NA ;
Homes, CC ;
Monkman, AP .
PHYSICAL REVIEW B, 2002, 66 (08) :852021-852028
[26]   TRANSPORT AND EPR STUDIES OF POLYANILINE - A QUASI-ONE-DIMENSIONAL CONDUCTOR WITH 3-DIMENSIONAL METALLIC STATES [J].
WANG, ZH ;
SCHERR, EM ;
MACDIARMID, AG ;
EPSTEIN, AJ .
PHYSICAL REVIEW B, 1992, 45 (08) :4190-4202
[27]  
Yan H, 2001, MACROMOL MATER ENG, V286, P139, DOI 10.1002/1439-2054(20010301)286:3<139::AID-MAME139>3.0.CO
[28]  
2-F
[29]   TRANSPORT NEAR THE METAL-INSULATOR-TRANSITION - POLYPYRROLE DOPED WITH PF(6) [J].
YOON, CO ;
REGHU, M ;
MOSES, D ;
HEEGER, AJ .
PHYSICAL REVIEW B, 1994, 49 (16) :10851-10863
[30]  
[No title captured]