TITLE

Hierarchical assembly of light-emitting polymer nanofibers in helical morphologies

AUTHOR(S)
Pagliara, Stefano; Camposeo, Andrea; Cingolani, Roberto; Pisignano, Dario
PUB. DATE
December 2009
SOURCE
Applied Physics Letters;12/28/2009, Vol. 95 Issue 26, p263301
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Single electrospun nanofibers of light-emitting conjugated polymers hierarchically assemble at nano- to macroscopic lengthscales in various helical morphologies. At nanoscopic lengthscales, molecular chains follow the microscopic assembly, prevalently aligning along the fiber dynamic axis, as demonstrated by polarized photoluminescence spectroscopy. The role of molecular weight in the resulting assembling and optical properties is highlighted and discussed. Nanofibers based on the heaviest polymer exhibit the most stretched helical geometries and the highest suppression of the excitonic energy migration, resulting in the most blue-shifted photoluminescence with respect to thin films.
ACCESSION #
47244479

 

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