Journal
JOURNAL OF APPLIED PHYSICS
Volume 120, Issue 8, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4961610
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Funding
- JSPS KAKENHI [JP25110014, JP24360011]
- Grants-in-Aid for Scientific Research [16KT0056, 15K13624, 25110014] Funding Source: KAKEN
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The conduction behavior of ultrathin films (about 10nm thick) composed of self-doped water-soluble polyaniline sulfonate (SPAN) was investigated using nano-gap electrodes under vacuum conditions. The conductance was found to be ohmic even in the high field regime up to 10(5) V cm(-1) over a temperature range of 10-300K. The temperature dependence of the conductance indicated that SPAN gave the extremely high value of localization length (L) = 300 nm without secondary doping, in comparison with conventional polyaniline. We propose that SPAN forms long-range highly crystalline metallic grains, and we observed intra-grain conduction due to some grains directly bridging the two nano-gap electrodes at low temperature. We conclude that inter-grain conduction becomes dominant as the temperature increases. Published by AIP Publishing.
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