Journal
SYNTHETIC METALS
Volume 161, Issue 21-22, Pages 2241-2248Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.synthmet.2011.08.027
Keywords
ESR; LESR; SWCNT; P3HT
Funding
- BMBF International Department [Rus 09/05]
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An electron spin resonance (ESR) X-band study of regio-regular poly(3-hexylthiophene) (RR-P3HT) and RR-P3HT/PCBM ([6,6]-phenyl-C-61-butyric acid methyl ester) composites blended with a low concentration (similar to 0.1-1%) of single wall carbon nanotubes (SWCNT) is presented. The substantial line-width broadening of polaron and PCBM anion radical ESR spectra was registered after SWCNT incorporation. The possibility of an electron spin exchange interaction between SWCNT conductive electrons and polymer polarons in the RR-P3HT:SWCNT blend without light illumination and between SWCNT conductive electrons and polymer polarons and PCBM anion radical electrons in the RR-P3HT:PCBM:SWCNT blend under light illumination is discussed. In addition, the unusually significant RR-P3HT film morphology (dominant crystalline phase orientation) is substantially altered, in particular a rotation of up to 90 of the P3HT crystalline phase relative to the film plane, due to SWCNT annexation in the polymer, is registered by the ESR spectra external magnetic field angular dependences. (C) 2011 Elsevier B.V. All rights reserved.
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