Nanoindentation study of the mechanical behavior of TiO2 nanotube arrays

Xu, Y.N., Liu, M.N., Wang, M.C., Oloyede, A., Bell, J.M., & Yan, C. (2015) Nanoindentation study of the mechanical behavior of TiO2 nanotube arrays. Journal of Applied Physics, 118(14), pp. 145301-1.

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Abstract

Titanium dioxide (TiO2) nanotube arrays are attracting increasing attention for use in solar cells, lithium-ion batteries, and biomedical implants. To take full advantage of their unique physical properties, such arrays need to maintain adequate mechanical integrity in applications. However, the mechanical performance of TiO2 nanotube arrays is not well understood. In this work, we investigate the deformation and failure of TiO2 nanotube arrays using the nanoindentation technique. We found that the load–displacement response of the arrays strongly depends on the indentation depth and indenter shape. Substrate-independent elastic modulus and hardness can be obtained when the indentation depth is less than 2.5% of the array height. The deformation mechanisms of TiO2 nanotube arrays by Berkovich and conical indenters are closely associated with the densification of TiO2 nanotubes under compression. A theoretical model for deformation of the arrays under a largeradius conical indenter is also proposed.

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ID Code: 88943
Item Type: Journal Article
Refereed: Yes
Keywords: Nanoindentation, TiO2 nanotube array, Densification, Mechanical property
DOI: 10.1063/1.4932213
ISSN: 1089-7550
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MATERIALS ENGINEERING (091200) > Ceramics (091201)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Funding:
Copyright Owner: Copyright 2015 AIP Publishing LLC
Deposited On: 12 Oct 2015 23:38
Last Modified: 13 Oct 2015 21:18

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