Layer-by-layer assembled electrochromic films for all-solid-state electrochromic devices

Eunkyoung Kim, Soonkyo Jung

Research output: Contribution to journalArticle

60 Citations (Scopus)

Abstract

A layer-by-layer (LBL) assembled electrochromic (EC) film was investigated by using poly(aniline-N-butylsulfonate)s (PANBS) as an electrochromic anionic polymer, and acid-doped polyaniline (PAN) and vinylbenzyldimethyl-n- octadecylammonium salts (VBOD) as a polycation. The layer sequence of the EC films was varied to optimize EC properties by changing the order of layer deposition. Electrochemical and electrochromic properties of EC films were highly dependent on the layer sequence. In the EC film composed alternatively of the PANBS/PAN and PANBS/VBOD bilayers (L1), higher redox current density was observed than that of the EC film composed conductive PANBS/ PAN layers. Furthermore, optical change (ΔOD) between the colored and the bleached state was largest in LI among the EC films assembled in this study. This indicates that charge transport in LI is more facile, reducing interlayer barrier (ILB) energy for charge transfer, possibly due to the flexible long alkyl chains of VBOD that may facilitate ion transport. An all-solid-state EC device based on an optimized LBL composition showed an EC response at 3 V within 1 s, with a stable memory effect.

Original languageEnglish
Pages (from-to)6381-6387
Number of pages7
JournalChemistry of Materials
Volume17
Issue number25
DOIs
Publication statusPublished - 2005 Dec 13

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Electrochromic devices
Aniline
Polyaniline
Salts
Charge transfer
Conductive films
Energy barriers
Polymers
Current density
Ions
Data storage equipment
Acids
aniline
Chemical analysis
polyaniline

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

Cite this

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abstract = "A layer-by-layer (LBL) assembled electrochromic (EC) film was investigated by using poly(aniline-N-butylsulfonate)s (PANBS) as an electrochromic anionic polymer, and acid-doped polyaniline (PAN) and vinylbenzyldimethyl-n- octadecylammonium salts (VBOD) as a polycation. The layer sequence of the EC films was varied to optimize EC properties by changing the order of layer deposition. Electrochemical and electrochromic properties of EC films were highly dependent on the layer sequence. In the EC film composed alternatively of the PANBS/PAN and PANBS/VBOD bilayers (L1), higher redox current density was observed than that of the EC film composed conductive PANBS/ PAN layers. Furthermore, optical change (ΔOD) between the colored and the bleached state was largest in LI among the EC films assembled in this study. This indicates that charge transport in LI is more facile, reducing interlayer barrier (ILB) energy for charge transfer, possibly due to the flexible long alkyl chains of VBOD that may facilitate ion transport. An all-solid-state EC device based on an optimized LBL composition showed an EC response at 3 V within 1 s, with a stable memory effect.",
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Layer-by-layer assembled electrochromic films for all-solid-state electrochromic devices. / Kim, Eunkyoung; Jung, Soonkyo.

In: Chemistry of Materials, Vol. 17, No. 25, 13.12.2005, p. 6381-6387.

Research output: Contribution to journalArticle

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