Flexible electrochromic devices based on optoelectronically active polynorbornene layer and ultratransparent graphene electrodes

Wei Ren Lian, Ying Chi Huang, Yi An Liao, Kun Li Wang, Lain Jong Li, Ching Yuan Su, Der Jang Liaw, Kueir Rarn Lee, Juin Yih Lai

Research output: Contribution to journalArticlepeer-review

47 Scopus citations

Abstract

Novel electrochromic polynorbornenes poly(NBPYTPAM) and poly(HNBPYTPAM), containing electroactive chromophores, were prepared via ring-opening metathesis polymerization (ROMP) from a new norbornene derivative (NBPYTPAM) using Grubbs' catalyst and followed by hydrogen reduction. The glass transition temperatures (T g) of poly(NBPYTPAM) and hydrogenated poly(HNBPYTPAM) were 190 and 175 °C, respectively. The cyclic voltammogram of the poly(HNBPYTPAM) film cast onto flexible graphene-coated polyethylene terephthalene (PET) substrates exhibited two reversible oxidation redox couples at 1.0 and 1.9 V. Flexible electrochromic devices were fabricated from the electroactive polymers and graphene-coated PET substrates. The electrochromic characteristics of poly(HNBPYTPAM) showed excellent stability and reversibility, with multistaged color changes from its yellow neutral form to green and then to dark-blue.

Original languageEnglish
Pages (from-to)9550-9555
Number of pages6
JournalMacromolecules
Volume44
Issue number24
DOIs
StatePublished - 27 Dec 2011

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