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Lyotropic 'hairy' TiO2 nanorods

Cheng, Fei; Verrelli, Emanuele; Alharthi, Fahad A.; Kelly, Stephen M.; O'Neill, Mary; Kemp, Neil T.; Kitney, Stuart P.; Lai, Khue T.; Mehl, Georg H.; Anthopoulos, Thomas


Fei Cheng

Fahad A. Alharthi

Mary O'Neill

Stuart P. Kitney

Khue T. Lai

Thomas Anthopoulos


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-w-[(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.

Journal Article Type Article
Publication Date Jan 1, 2019
Journal Nanoscale Advances
Electronic ISSN 2516-0230
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 1
Issue 1
Pages 254-264
APA6 Citation Cheng, F., Verrelli, E., Alharthi, F. A., Kelly, S. M., O'Neill, M., Kemp, N. T., …Anthopoulos, T. (2019). Lyotropic 'hairy' TiO2 nanorods. Nanoscale advances, 1(1), 254-264.
Keywords Titanum Oxide; Nanorods; Liquid crystals; Self-assembled Dielectric Layers
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This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence.

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