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In situ UV/VIS Spectroscopy of Electrochemically Synthesized SelenopheneThiophene Copolymers
Author(s) -
Alakhras Fadi
Publication year - 2015
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.201400364
Subject(s) - thiophene , copolymer , chemistry , monomer , band gap , bipolaron , polymerization , spectroscopy , valence (chemistry) , polymer chemistry , ultraviolet visible spectroscopy , photochemistry , polymer , materials science , organic chemistry , electron , polaron , optoelectronics , physics , quantum mechanics
Abstract In situ UV/VIS spectroscopy of selenophenethiophene homo‐ and copolymer films had been investigated. λ $\rm{{_{max}^{1}}}$ corresponding to the π → π * interband transition was determined. The optical transition with λ $\rm{{_{max}^{2}}}$ from the valence band into the higher bipolaron band was also allocated. Besides, band gap energy ( E g ) of the individual homopolymer and the obtained copolymer films from a direct interband transition was estimated as well, and the values were between 1.91–2.10 eV. The influence of applied polymerization potential and monomer feed ratio on the optical properties of the copolymers is discussed.