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Fabrication and Optical Properties of Electrospun Organic Semiconductor Nanofibers from Blended Polymer Solution

Published online by Cambridge University Press:  01 February 2011

Surawut Chuangchote ,
Takashi Sagawa  and
Susumu Yoshikawa
Surawut Chuangchote
Affiliation:
[email protected], Kyoto University, Institute of Advanced Energy, Gokasho, Uji, 611-0011, Japan
Takashi Sagawa
Affiliation:
[email protected], Kyoto University, Institute of Advanced Energy, Gokasho, Uji, 611-0011, Japan, +81774384580, +81774383508
Susumu Yoshikawa
Affiliation:
[email protected], Kyoto University, Institute of Advanced Energy, Gokasho, Uji, 611-0011, Japan
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Abstract

Ultrafine organic semiconductor fibers with the average diameters ranging in sub-micro-down to nanometers (43 nm - 1.7 µm) were fabricated by electrospinning of a mixture of poly(2-methoxy-5-(2′-ethylhexyloxy)-1,4-phenylene-vinylene) (MEH-PPV) and polyvinylpyrrolidone (PVP) in various mixed solvents. The average diameter of the as-spun fibers decreased into nanometer scale with decreasing the concentration of PVP. Addition of a volatile organic salt (pyridinium formate, PF) or utilization of three-mixed solvent system was also effective to reduce the size of the diameter of as-spun fibers. After the removal of PVP from as-spun fibers by Soxhlet extraction, pure MEH-PPV fibers were obtained as a ribbon-like structure aligned with wrinkled surface in fiber direction. As-spun fibers showed relatively higher crystallinity, higher conjugation length, and a remarkable blue shift of photoluminescence (PL) peak was observed, in comparison with the cast film. The increase in composition of MEH-PPV and the removal of PVP from as-spun MEH-PPV/PVP fibers resulted in a significant blue-shift in UV-Vis absorption peak and red-shift in PL peak.

Keywords

polymerfiberphotoemission
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1091: Symposium AA – Conjugated Organic Materials–Synthesis, Structure, Device and Applications , 2008 , 1091-AA07-85
Copyright
Copyright © Materials Research Society 2008

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