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Electrochromic pattern formation by photo cross-linking reaction of PEDOT side chains

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Abstract

An electrochemically and photochemically polymerizable monomer, 2-((2,3-dihydrothieno[3,4-b][1,4]dioxin-2-yl)methoxy)ethyl methacrylate (EDOT-EMA), was explored for patterning of poly(3,4-ethylenedioxythiophene) (PEDOT) via side chain cross-linking. The polymer from EDOT-EMA was deposited electrochemically to produce polymeric EDOT (PEDOT-EMA), which was directly photo-patterned by UV light as the side EMA groups of PEDOT-EMA were polymerized to give cross-linked EMA (PEDOT-PEMA). Absorption and FTIR studies of the UV-exposed film (PEDOT-PEMA) indicated that the photo-patterning mainly originated from the photo cross-linking of the methacrylates in the side-chain. After irradiation of the film, the conductivity of the irradiated area decreased from 5.6×10−3 S/cm to 7.2×10−4 S/cm, possibly due to bending of the conductive PEDOT channel as a result of the side chain cross-linking. The patterned film was applied to a solid state electrochromic (EC) cell to obtain micro-patterned EC cells with lines up to 5 μm wide.

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  1. Department of Chemical and Biomolecular Engineering, Yonsei University, 120-749, Seoul, Korea

    Jeonghun Kim, Yuna Kim & Eunkyoung Kim

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  1. Jeonghun Kim
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  2. Yuna Kim
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Correspondence to Eunkyoung Kim.

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Kim, J., Kim, Y. & Kim, E. Electrochromic pattern formation by photo cross-linking reaction of PEDOT side chains. Macromol. Res. 17, 791–796 (2009). https://doi.org/10.1007/BF03218616

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  • DOI: https://doi.org/10.1007/BF03218616

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