Electropolymerization Of A New Carbazole-Tetra Substituted Phenylethene Derivative And Its Electrochromic Device Application
A new carbazole derivative monomer 1,1,2,2-tetrakis(4-(9H-carbazol-9-yl)phenyl)ethene (TCP) was synthesized and characterized by Nuclear Magnetic Resonance (NMR), Fourier Transform Infrared (FT-IR), and UV–vis spectroscopies and then electropolymerized. The electrochemical polymerization of this newlysynthesized TCP monomer was performed in dichloromethane(DCM)/ 0.1 M tetrabutylammonium hexafluoraphosphate (TBAPF6) solvent/ electrolyte couple.An insoluble film was deposited on the electrode surface, both during repetitive cycling and constant potential electrolysis at 1.6 V. Resulting polymer film, P(TCP), was characterized utilizing UV–vis andFT-IR spectroscopic techniques and its electrochemical behavior was investigated via cyclic voltammetry (CV). Spectroelectrochemical behavior of the polymer film on indium tin oxide (ITO) working electrode was investigated by recording the electronic absorption spectra, in situ, in monomer-free electrolytic solution at different potentials and it is found that the P(TCP) film can be reversibly cycled between 0.0 and 1.65 V anddemonstrates a stable electrochromic behavior; transparent in the neutral state, olive green in the intermediate state and green in the oxidized state. It is also noteworthy that the device shows good environmental and redox stabilityFurthermore, a dual type electrochromic device based on P(TCP) was constructed and its spectroelectrochemical properties were investigated. Optical density and response time of the dual-type electrochromic device based on P(TCP) were found to be 0.20 and 0.6 s at 600 nm, respectively.
Index Terms—Polycarbazole, Electrochemical Polymerization, Electrochromic Device.