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Synthesis and c haracterization of highly transparent nanocomposite optical films

YANG YEN YU1,2,* , HUI-HUAN YU1, WEN CHEN CHIEN3

Affiliation

  1. Department of Materials Engineering, Ming C hi University of Technology, No.84, Gongzhuan Rd., Taishan Dist. Dist., New Taipei City 24301, Taiwan
  2. Department of Chemical and Materials Engineering, Chang Gung University, No.259, Wenhua 1st Rd., Guishan Dist., Taoyuan City 33302, Taiwan
  3. Department of Chemical Engineering, Ming Chi University of Technology, No.84, Gongzhu an Rd., Taishan Dist. Dist., New Taipei City 24301, Taiwan

Abstract

In this study, two types of highly transparent polyimide–nanocrystalline-titania hybrid optical films with a relatively high titania content were fabricated using the sol-gel process. An organo-soluble polyimide was synthesized from 4,4’-(hexafluoroisopropylidene) diphthalic anhydride, 3,3’-diaminodiphenyl sulfone, and 4-aminobenzoic acid. Such carboxylic acid end groups provided the organic–inorganic bonding with titania and obtained a homogeneous hybr id solution. The surface hardness and elastic modulus of polyimide and the polyimide–nanocrystalline-titania hybrid films increased from 0.5 to 1.26 GPa and 5.5 to 20.57 GPa, respectively, with respect to an increase in the inorganic content from 0 to 6 0 w t%. Transmission electron microscopy and X-ray diffraction indicated the formation of nanocrystalline-titania domains of approximately 3-4 nm in the hybrid films. A three layer antireflection coating based on the prepared hybrid films was designed and posses sed a reflectance of less than 1% in the visible range. The experimental results suggest that the prepared hybrid films demonstrate high thermal stability, favorable surface planarity, tunable refractive indices, and optical transparency in the visible range. These results indicate that the polyimide–nanocrystalline-titania hybrid materials have potential applications for optical devices..

Keywords

Polyimide Titanium butoxide Refractive index Cutoff wave length.

Citation

YANG YEN YU, HUI-HUAN YU, WEN CHEN CHIEN, Synthesis and c haracterization of highly transparent nanocomposite optical films, Optoelectronics and Advanced Materials - Rapid Communications, 11, 3-4, March-April 2017, pp.221-228 (2017).

Submitted at: Aug. 3, 2016

Accepted at: April 6, 2017