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Strongly Photosensitive and Fluorescent F8T2 Electrospun Fibers
Author(s) -
Ferreira Isabel,
Baptista Ana Catarina,
Leitão Joaquim Pratas,
Soares Jorge,
Fortunato Elvira,
Martins Rodrigo,
Borges João Paulo
Publication year - 2013
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.201200009
Subject(s) - materials science , cyan , fluorescence , photosensitivity , photoluminescence , optical fiber , green light , wavelength , optoelectronics , ultraviolet , fiber , luminescence , optics , ultraviolet light , blue light , composite material , physics
Electrospun fibers of poly[(9,9‐dioctylfluorenyl‐2,7‐diyl) ‐co‐ bithiophene] (F8T2) with exceptional electro‐optical performance are obtained. The I / T characteristics measured in fibers with 7–15 µm diameter and 1 mm length show a semiconductor behavior; their thermal activation energy is 0.5 eV and the dark conductivity at RT is 5 × 10 −9 (Ω cm) −1 . Besides exhibiting a photosensitivity of about 60 under white light illumination with a light power intensity of 25 mW · cm −2 , the fibers also attain RT photoluminescence in the cyan, yellow, and red wavelength range under ultraviolet, blue, and green light excitation, respectively. Optical microscope images of F8T2 reveal homogeneous electrospun fibers, which are in good agreement with the uniformly radial fluorescence observed.