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Lyotropic ‘hairy’ TiO2 nanorods

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Abstract

We report the synthesis of the first stable, solution-processable and photocrosslinkable hybrid organic/inorganic titanium dioxide nanorods as ‘hairy rods’ coated with phosphonate ligands with photoreactive coumarin groups located in a terminal position. The relationships between the chemical structure of the diethyl-ω-[(7-oxycoumaryl)-n-alkyl]phosphonate ligands on the ligand exchange rate (LER) and the solubility of the resultant ligand-stabilized titanium dioxide nanorods in organic solvents are elucidated. These TiO2 nanorods, with an organic ligand coating, are short enough (aspect ratio = 5–8) to be dissolved in chlorobenzene at high concentrations, but long enough to form lyotropic nematic liquid crystals. These colloidal solutions are used to deposit a thin, uniform layer of hybrid organic/inorganic TiO2 nanorods with their long axes in the plane of a flat, smooth substrate through a self-organization process. Standard photolithographic patterning creates an insoluble dielectric layer of the desired thickness, smoothness and uniformity and with a dielectric constant of sufficient magnitude, k = 8, suitable for the fabrication of multilayer, plastic electronic devices using solution-based fabrication techniques, such as ink-jet printing, used in roll-to-roll manufacturing.

Graphical abstract: Lyotropic ‘hairy’ TiO2 nanorods

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Publication details

The article was received on 21 Jun 2018, accepted on 19 Jul 2018 and first published on 17 Aug 2018


Article type: Paper
DOI: 10.1039/C8NA00054A
Citation: Nanoscale Adv., 2019, Advance Article
  • Open access: Creative Commons BY-NC license
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    Lyotropic ‘hairy’ TiO2 nanorods

    F. Cheng, E. Verrelli, F. A. Alharthi, S. M. Kelly, M. O'Neill, N. T. Kemp, S. P. Kitney, K. T. Lai, G. H. Mehl and T. Anthopoulos, Nanoscale Adv., 2019, Advance Article , DOI: 10.1039/C8NA00054A

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