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Solution-processable, niobium-doped titanium oxide nanorods for application in low-voltage, large-area electronic devices

Alharthi, F. A.; Cheng, F.; Verrelli, E.; Kemp, N. T.; Lee, A. F.; Isaacs, M. A.; O’Neill, M.; Kelly, S. M.


F. A. Alharthi

F. Cheng

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Dr Emanuele Verrelli
Lecturer in Physics, Director of Postgraduate Researchers, Seminar organiser, First aider

N. T. Kemp

A. F. Lee

M. A. Isaacs

M. O’Neill

S. M. Kelly


We report for the first time the one-step synthesis of solution-processable, highly crystalline, niobiumdoped titanium dioxide (Nb-TiO2) nanorods in the anatase phase by the hydrolytic condensation of Ti(OiPr)4 and niobium(V) ethoxide using oleic acid as a structure-directing and stabilising agent. These novel surface-stabilised nanorods can be easily dispersed in common solvents at relatively high concentration (B10%) and deposited as uniform, thin and transparent films on planar substrates for the fabrication of electronic devices. The small size of the nanoparticles synthesized represents an important advance in achieving high-k dielectric thin films smooth enough to be suitable for OFET applications and the plastic electronics filed in general. Preliminary investigations show that the dielectric constant, k, of niobium-doped (7.1 wt%) titanium dioxide (Nb-TiO2) nanorods at frequencies in the region of 100 kHz–1 MHz, are more a third greater (k 4 8) than that (k = 6) determined for the corresponding undoped titanium dioxide (TiO2) nanorods. The current–voltage (J–V) behaviour of these devices reveal that niobium-doping improves, by reducing, the leakage current of these devices, thereby preventing hard dielectric breakdown of devices incorporating these new nanorods.


Alharthi, F. A., Cheng, F., Verrelli, E., Kemp, N. T., Lee, A. F., Isaacs, M. A., …Kelly, S. M. (2017). Solution-processable, niobium-doped titanium oxide nanorods for application in low-voltage, large-area electronic devices. Journal of Materials Chemistry C, 6(5), 1038-1047.

Journal Article Type Article
Acceptance Date Dec 27, 2017
Online Publication Date Dec 28, 2017
Publication Date Dec 28, 2017
Deposit Date Mar 2, 2018
Publicly Available Date Dec 29, 2018
Print ISSN 2050-7526
Electronic ISSN 2050-7534
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 6
Issue 5
Pages 1038-1047
Keywords Materials Chemistry; General Chemistry
Public URL
Publisher URL!divAbstract
Additional Information : This document is Similarity Check deposited; CrossRef DOI Link to Correction::; : N. T. Kemp (ORCID); : N. T. Kemp (ResearcherID); : A. F. Lee (ORCID); : A. F. Lee (ResearcherID); : M. A. Isaacs (ORCID); : M. A. Isaacs (ResearcherID); : S. M. Kelly (ORCID); : Single-blind; : Received 13 September 2017; Accepted 27 December 2017; Accepted Manuscript published 28 December 2017; Advance Article published 17 January 2018; Version of Record published 1 February 2018


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