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Proceedings Paper

Ultrafast laser patterning and defect generation in titania nanotubes for the enhancement of optical and photocatalytic properties
Author(s): Rakesh Arul; Reece N. Oosterbeek; Junzhe Dong; Wei Gao; M. Cather Simpson
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Paper Abstract

This study demonstrates the first known instance of the templating of titanium dioxide nanotube arrays by laser induced periodic surface structures (LIPSS) and subsequent electrochemical anodization. Titanium dioxide is an established photocatalyst, however it suffers from poor visible light absorption, thus limiting its use under solar irradiation. Thermal annealing can enhance the visible light absorption, with the downside of introducing more defect traps that reduce the lifetime of the charge separated state. Hence, this study proposes an alternative to chemical methods, by modulating the surface profile of the nanotube array to trap visible light. The enhanced visible light absorption is predicted via computational modelling and the morphological evolution of the anodization process was investigated. This study provides the basis for further work into LIPSS templating of other anodized transition metal oxide materials.

Paper Details

Date Published: 20 February 2017
PDF: 10 pages
Proc. SPIE 10093, Synthesis and Photonics of Nanoscale Materials XIV, 100930K (20 February 2017); doi: 10.1117/12.2253119
Show Author Affiliations
Rakesh Arul, The Univ. of Auckland (New Zealand)
The MacDiarmid Institute for Advanced Materials and Nanotechnology (New Zealand)
The Dodd-Walls Ctr. for Photonic and Quantum Technologies (New Zealand)
Reece N. Oosterbeek, The Univ. of Auckland (New Zealand)
The MacDiarmid Institute for Advanced Materials and Nanotechnology (New Zealand)
The Dodd-Walls Ctr. for Photonic and Quantum Technologies (New Zealand)
Junzhe Dong, The Univ. of Auckland (New Zealand)
Wei Gao, The Univ. of Auckland (New Zealand)
M. Cather Simpson, The Univ. of Auckland (New Zealand)
The MacDiarmid Institute for Advanced Materials and Nanotechnology (New Zealand)
The Dodd-Walls Ctr. for Photonic and Quantum Technologies (New Zealand)


Published in SPIE Proceedings Vol. 10093:
Synthesis and Photonics of Nanoscale Materials XIV
David B. Geohegan; Jan J. Dubowski; Andrei V. Kabashin, Editor(s)

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