Poly(thieno[3,4-b]-1,4-oxathiane) and poly(3,4-ethylenedioxythiophene-co-thieno[3,4-b]-1,4-oxathiane)/poly(styrene sulfonic sodium): Preparation, characterization, and optoelectronic performance

Abstract

In this work, the asymmetrical analog of 3,4-ethylenedioxythiophene (EDOT), thieno[3,4-b]-1,4-oxathiane (EOTT), was synthesized and chemically polymerized first in aqueous solution using poly(styrene sulfonic sodium) (PSS) as the polyelectrolyte to yield poly(thieno[3,4-b]-1,4-oxathiane) (PEOTT)/ PSS. As-formed film exhibited low electrical conductivity (10 24 S/cm). Alternatively, EOTT together with EDOT (in different molar ratio of 1:1 and 1:5) was copolymerized and the polymer poly(EOTT-co-EDOT)/PSS had electrical conductivity of 10 21 S/cm. After dimethyl sulfoxide (DMSO) treatment, the electrical conductivity was enhanced to 10 0 S/cm; however, the conductivity of the above homopolymer was reduced (10 25 S/cm). Raman spectroscopy was used to interpret conductivity enhancement or reduction after DMSO treatment. The conductivity decrease of PEOTT/PSS compared to poly(EOTT-co-EDOT)/PSS may arise from the conformational change of PEOTT backbone from the quasi-planar to the distorted planar mode induced by PSS -/PSSH through ionic interaction. Kinetic studies revealed that the copolymer had high coloration efficiencies (375 cm 2 /C), low switching voltages (20.8 to 10.6 V), decent contrast ratios (45%), moderate response time (1.0 s), excellent stability, and color persistence. An electrochromic device employing poly(3-methylthiophene) and poly(EOTT-co-EDOT)/PSS as the anode and cathode materials was also studied. From these results, poly(EOTT-co-EDOT)/PSS would be a promising candidate material for organic electronics.

Vapor-Phase Polymerized Poly(3,4-Ethylenedioxythiophene) on a Nickel Nanowire Array Film: Aqueous Symmetrical Pseudocapacitors with Superior Performance

“…Among the various conducting polymers, poly(3,4-ethylenedioxythiophene) (PEDOT) possesses excellent environmental stability, a narrow bandgap (e.g., ca. 1.6 eV), a low oxidation potential, a wide potential window for both positive (p-) and negative (n-) doping, environmentally benign characteristics, high electrical conductivity and good optical transparency as a result of its linear structure without the appearance of α , β -mislinking [13], which makes it an ideal prototypical material for electrochromics [14], solar cells [15], fuel cells [16], and supercapacitors [17]. …”