Preparation of Multicolor Electrochromic Polymer Composite Film with Laminated Structure†

doi:10.7503/cjcu20180535

Abstract

Abstract:

Two electrochromic polymers,poly(3,4-ethylenedioxythiophene)(PEDOT) and poly{4,4',4″-tris[4-(2-bithienyl)pheny]amine}(PTBTPA)with different neutral absorption spectra and the complementary colors were synthesized via electrochemical polymerization method, respectively. Then the composite film with the laminated structure was controllably prepared by adjusting the electrochemical polymerization parameters. FTIR spectra and SEM images indicate that the laminated composite film is obtained. UV-Vis spectra and electrochemical measurements demonstrate that the composite film exhibits a noticeable electrochromism with reversible color changes from orange, blue to dark green, and maintains good electrochemical activity and optical contrast compared to those of the pristine PTBTPA film and PEDOT film. This work is to provide a simple and efficient method to build the laminated composite structure for achieving multicolor or even full-color electrochromic materials, which is also suitable for other electrochromic polymer systems.

Key words: Electrochromic, Electropolymerization, Laminated structure, Polymer composite, Multicolor display

CLC Number:

O631
O646

TrendMD:

OUYANG Mi,ZHU Rui,LÜ Xiaojing,QU Xingxing,LI Weijun,LI Lin,LÜ Yaokang,ZHANG Cheng. Preparation of Multicolor Electrochromic Polymer Composite Film with Laminated Structure^†[J]. Chem. J. Chinese Universities, 2019, 40(3): 576.

Figures/Tables 10

Scheme 1 Synthesis routes of TBTPA monomer

Fig.1 Schematic diagram of laminated composite film

Fig.2 Infrared spectra of PTBTPA(a), PEDOT(b) and laminated composite film(c)

Fig.3 SEM images of PTBTPA film(A), PEDOT film(B), surface(C) and cross-section(D) of the composite film

Fig.4 Cyclic voltammetry curves of PTBTPA film in 0.1 mol/L [BMIM]BF4/CH2Cl2∶ACN(7∶3, volume ratio) solution(A), PEDOT film in 0.1 mol/L [BMIM]TF2N / CH2Cl2 solution(B) and composite film in 0.1 mol/L [BMIM]BF4/CH2Cl2∶ACN(C)

Fig.5 Spectroelectrochemical spectra of PTBTPA film(A), PEDOT film(B) and composite film(C) at different potentialsInsets are the color changes of corresponding films under different potentials.

Fig.6 Optical contrast of PEDOT polymer film at 635 nm(A) and 1100 nm(B)

Fig.7 Optical contrast of PTBTPA polymer film at 450 nm(A) and 635 nm(B)

Fig.8 Optical contrast of composite film at 450 nm(A—C) and 1100 nm(D—F)(A, D) 0.03 C; (B, E) 0.05 C; (C, F) 0.07 C.

Fig.9 Color changes of electrochromic device assembled with composite film at different potentials

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