Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1443377 | Synthetic Metals | 2009 | 6 Pages |
Abstract
Zero-field cooled-field-cooled (ZFC-FC) technique was used to investigate the effect of low temperature (4.6Â K) on the interactions of polarons in weakly FeCl3-doped poly(3-dodecylthiophene (PDDT). It was found that the magnetic properties of the system changed with the length of time system spent at low temperature: the Currie-Weiss paramagnetism gradually changed over to “antiferromagnetism” and ultimately to diamagnetism. This effect is connected with the thermochromic properties of self-organized PDDT in primary (10-15Â nm) or secondary (30-50Â nm) induced aggregates, in which cooling under the glass transition temperature Tg (â¼240Â K) causes extension of the effective conjugation length of coplanar polymer chains. Changes in magnetic properties are related to the inter- and intra-chain interactions of polaron states within both the primary and secondary induced aggregates.
Related Topics
Physical Sciences and Engineering
Materials Science
Biomaterials
Authors
G. ÄÃk, L. DlháÅ, F. Å erÅ¡eÅ, T. PlecenÃk, I. ÄerveÅ,