Photopatternable Electrochromic Materials from Oxetane Precursors.
ACS applied materials & interfaces(2014)
摘要
Conjugated thiophenoazomethine triads containing an acid sensitive oxetane group were prepared. The solution processable monomers were immobilized on glass and ITO coated glass substrates by photoacid induced cationic ring-opening polymerization (CROP) of the oxetane moiety. Photolithography using a photoacid generator and photosensitizer were used to pattern an electroactive polymer. Micro- and macroscale patterns ranging between 20 mu m and 50 mm were possible with the electrochromic materials. The photopolymerized azomethine remained electroactive, and it could be repeatedly switched electrochemically between its neutral (mauve, lambda(max) = 535 nm) and oxidized (blue, lambda(max) = 585 nm) states without degradation. The electrochromic properties were evaluated in a simulated device where the colors were successfully cycled between blue (oxidized) and purple (neutral) states with applied biases of +0.6 V and -0.6 V vs Fc/Fc(+) under ambient conditions without significant color fatigue or degradation.
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关键词
Photolithographic patterning,cationic ring-opening polymerization,electroactive polymers
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