Liu Dan, Osuna Orozco Rodrigo, Wang Tao
School of Physics and Astronomy, University of Leeds, Leeds, LS2 9JT, United Kingdom.
Phys Rev E Stat Nonlin Soft Matter Phys. 2013 Aug;88(2):022601. doi: 10.1103/PhysRevE.88.022601. Epub 2013 Aug 19.
The deviations of the glass transition temperature (T(g)) in thin films of an amorphous conjugated polymer poly(9,9-dioctylfluorene-co-N-(4-butylphenyl)diphenylamine) (TFB) are reported. Monotonic and nonmonotonic T(g) deviations are observed in TFB thin films supported on Si-SiOx and poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS), respectively. A three-layer model is developed to fit both monotonic and nonmonotonic T(g) deviations in these films. A 5-nm PEDOT:PSS capping layer was not found to be effective to remove the free-surface effect in Si-SiOx supported TFB films.
