Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6662789 | Journal of Electroanalytical Chemistry | 2014 | 8 Pages |
Abstract
Three electroactive terthienyl based monomers, namely 1-phenyl-2-[4-(2,2â²:5â²,2â³-terthien-3â²-ylmethoxy)phenyl]diazene (TTAz), 4-(2,2â²:5â²,2â³-terthien-3â²-ylmethoxy)-2H-chromen-2-one (TTCo) and methyl 2-[3-oxo-6-(2,2â²:5â²,2â³-terthien-3â²-ylmethoxy)-3H-xanthen-9-yl] benzoate (TTFlo), were synthesized with good yields and their conducting polymers were electrochemically prepared on ITO electrode surfaces. The effect of chromophore type on electrochemical and optical properties of the polymers was investigated using cyclic voltammetry and spectroelectrochemical techniques in detail. Results revealed that type of chromophore group greatly influences the electronic and optoelectronic behaviors of electrochromic materials. It was observed that PTTAz, PTTCo and PTTFlo also exhibited multicolored electrochromism at their neutral and oxidized states. Electrochromic switching studies indicated that PTTAz (28% at 500Â nm, 25% at 770Â nm and 64% at 1220Â nm) and PTTCo (25% at 475Â nm, 32% at 740Â nm and 63% at 1200Â nm) have higher optical contrasts (ÎT%) with longer switching times than those of PTTFlo (16% at 496Â nm and 50% at 1280Â nm) in both visible and NIR regions. Comparing with PTTFlo film, PTTAz and PTTCo polymer films showed more reasonable switching stabilities. Besides, the optical band gaps were calculated from the onset of Ï-Ï* transition in polymer's neutral states, as 1.65Â eV, 1.80Â eV and 1.78Â eV for PTTAz, PTTCo and PTTFlo, respectively.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Deniz YiÄit, Yasemin Arslan Udum, Mustafa Güllü, Levent Toppare,