Lyotropic 'hairy' TiO2 nanorods

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Cheng, F., Verrelli, E., Alharthi, F.A., Kelly, S.M., O'Neill, M. ORCID: 0000-0002-0232-5250, Kemp, N.T., Kitney, S.P., Lai, K.T., Mehl, G.H. and Anthopoulos, T., 2019. Lyotropic 'hairy' TiO2 nanorods. Nanoscale Advances, 1 (1), pp. 254-264. ISSN 2516-0230

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Official URL: http://doi.org/10.1039/c8na00054a

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-u-[(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 ¼ 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 ¼ 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.

Item Type:

Journal article

Publication Title:

Nanoscale Advances

Creators:

Cheng, F., Verrelli, E., Alharthi, F.A., Kelly, S.M., O'Neill, M., Kemp, N.T., Kitney, S.P., Lai, K.T., Mehl, G.H. and Anthopoulos, T.

Publisher:

Royal Society of Chemistry

Date:

2019

Volume:

Number: