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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

Authors

Fei Cheng

Fahad A. Alharthi

Mary O'Neill

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Dr Neil Kemp N.Kemp@hull.ac.uk
Director of Postgraduate Researchers (Physics and Mathematics), Senior Lecturer in Physics

Stuart P. Kitney

Khue T. Lai

Thomas Anthopoulos



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-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.

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. https://doi.org/10.1039/c8na00054a

Journal Article Type Article
Acceptance Date Jul 19, 2018
Online Publication Date Aug 17, 2018
Publication Date Jan 1, 2019
Deposit Date Sep 13, 2018
Publicly Available Date Sep 14, 2018
Journal Nanoscale Advances
Electronic ISSN 2516-0230
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 1
Issue 1
Pages 254-264
DOI https://doi.org/10.1039/c8na00054a
Keywords Titanum Oxide; Nanorods; Liquid crystals; Self-assembled Dielectric Layers
Public URL https://hull-repository.worktribe.com/output/1041704
Publisher URL http://pubs.rsc.org/en/Content/ArticleLanding/2018/NA/C8NA00054A#!divAbstract

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