Strongly Photosensitive and Fluorescent F8T2 Electrospun Fibers

Ferreira, Isabel, Ana Catarina Baptista, Joaquim Pratas Leitão, Jorge Soares, Elvira Fortunato, Rodrigo Martins, and João Paulo Borges. "Strongly Photosensitive and Fluorescent F8T2 Electrospun Fibers." Macromol Mater Eng 298 (2013): 174-180.


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.

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