Electrochromic properties of a novel low band gap conjugated copolymer based on 1,4-bis(2-thienyl)-naphthalene and 3,4-ethylenedioxythiophene
作者： Bin Wang , Jinsheng Zhao , Chuansheng Cui , Renmin Liu , Jifeng Liu
DOI: 10.1016/J.ELECTACTA.2011.03.020
关键词: Cyclic voltammetry 、 Fourier transform infrared spectroscopy 、 Electrochromic devices 、 Copolymer 、 Thermogravimetry 、 Electrochromism 、 Band gap 、 Materials science 、 Analytical chemistry 、 Thermal analysis
摘要: Abstract 1,4-Bis(2-thienyl)-naphthalene (BTN) monomer is successfully synthesized via coupling reaction. A novel copolymer based on 1,4-bis(2-thienyl)-naphthalene and 3,4-ethylenedioxythiophene (EDOT) electrochemically characterized. Characterizations of the resulting P(BTN-co-EDOT) are performed by cyclic voltammetry (CV), UV–vis spectroscopy, Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) thermogravimetry (TG). At neutral state copolymer, π–π* transition absorption peak located at 515 nm optical band gap ( E g ) calculated as 1.73 eV. Spectroelectrochemical analysis reveals that film has distinct electrochromic properties from BTN homopolymer shows six different colors under various potentials. The a maximum contrast (Δ T %) 48.4% 504 nm with response time 0.88 s 45.2% 770 nm 0.84 s. An device (ECD) poly(3,4-ethylenedioxythiophene) (PEDOT) constructed 645 nm found to be 21.1% measured 0.41 s. coloration efficiency (CE) 154 cm 2 C −1 645 nm.
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