Preparation and Electrochromic Properties of TiO2-PTPAT Nano Core/Shell Composite Films

doi:10.7503/cjcu20200455

Abstract

Abstract:

The vertically grown TiO₂ nanorod array was prepared on fluorine-doped tin oxide（FTO） con- ductive glass substrates via hydrothermal method， and then TiO₂-poly（tris［4-（thiophen-2-yl）phenyl］amine）（PTPAT） core/shell structure composite films were prepared by in?situ electrochemical polymerization using TiO₂ nanorod arrays as templates. Compared with the pure PTPAT film， the composite film showed well electrochromic（EC） properties. The optical contrast of PTPAT film is 28% at 600 nm， 60% at 1100 nm， and the discoloring time is 3.86 s and the coloring time is 5.52 s at 1100 nm； the optical contrast of TiO₂-PTPAT compo- site film is 43% at 600 nm， 79% at 1100 nm， and the discoloring time is 3.35 s and the coloring time is 4.43 s at 1100 nm. The results show that the core/shell composite structure film has better optical contrast and swit- ching time performance. The PTPAT film and the TiO₂-PTPAT composite film are used as the EC layer to assemble EC solid devices. The composite film-based devices show better cycle stability and higher withstand voltage. This is because the composite film maintains the original electrochromic properties of the PTPAT film. Due to the introduction of orderly grown nano-array structure， the specific surface area of the film is increased， and more ordered channels are provided for the doping and dedoping of ions in the electrochromic process， thereby accelerating the ion diffusion speed. At the same time， the introduction of TiO₂ array improves the interface bonding between the polymer film and the transparent conductive electrode， thus improves the stability of the device.

Key words: TiO₂ nanorod arrays, Poly（tris［4-（thiophen-2-yl）phenyl］amine）, Nanocomposite, Electrochromic, Electrochemical polymerization

CLC Number:

O646

TrendMD:

OUYANG Mi, CHEN Lu, HU Xuming, LI Yuwen, DAI Dacheng, TU Yuanbo, BAI Ru, LÜ Xiaojing, ZHANG Cheng. Preparation and Electrochromic Properties of TiO₂-PTPAT Nano Core/Shell Composite Films[J]. Chem. J. Chinese Universities, 2020, 41(12): 2796.

Figures/Tables 9

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Preparation and Electrochromic Properties of TiO₂-PTPAT Nano Core/Shell Composite Films

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