Live Templates of a Supramolecular Block Copolymer for the Synthesis of Ordered Nanostructured TiO2 Films via Guest Exchange

Wei Tsung Chuang, Yan Ming Hsu, En Li Lin, I. Ming Lin, Ya Sen Sun, Yeo Wan Chiang, Chun Jen Su, Yao Chang Lee, U. Ser Jeng

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

In this work, we introduce a facile method based on host-guest chemistry to synthesize a range of nanostructured TiO2 materials using supramolecular templates of a dendron-jacketed block copolymer (DJBCP). The DJBCP is composed of amphiphilic dendrons (4′-(3,4,5-tridodecyloxybenzoyloxy)benzoic acid, TDB) selectively incorporated into a P4VP block of polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) via hydrogen bonding. The PS-b-P4VP host acts as a structure-directing template, while the guest molecules (TDB) assist the self-assembly nanostructures and zone-axis alignment, resulting in the nanostructured template of vertically oriented cylinders formed via successive phase transformations from Im3m to R3m to P6mm upon thermal annealing in the doctor-blade-cast film. The guest molecules subsequently direct the titania precursors into the P4VP domains of the templates via supramolecular guest exchange during immersion of the film in a designated precursor solution containing a P4VP-selective solvent. The subsequent UV irradiation step leads to the formation of PS-b-P4VP/TiO2 hybrids. Finally, removal of the host template by calcination leaves behind mesoporous channels and makes sacrifices to be a carbon source for carbon-doping TiO2 materials. Various TiO2 nanoarchitectures, namely, vertical and wiggly micrometer-length channels, inverse opals, fingerprint-like channels, heterogeneous multilayers, and nanotubes, have been fabricated by highly tunable DJBCP nanostructures.

Original languageEnglish
Pages (from-to)33221-33229
Number of pages9
JournalACS Applied Materials and Interfaces
Volume8
Issue number48
DOIs
StatePublished - 7 Dec 2016

Keywords

  • block copolymers
  • dendrons
  • guest exchange
  • mesoporous films
  • vertical channels

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