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On-line monitoring of laser modification of titanium dioxide using optical surface second harmonic.

Vrillet, Guerric; Lee, Soo Keun; McStay, Daniel; Robertson, Peter K.J.

Authors

Guerric Vrillet

Soo Keun Lee

Daniel McStay

Peter K.J. Robertson



Abstract

TiO2 photocatalysis is a promising technology for the destruction of organic pollutants in both waste and potable waters with the mineralisation of a wide range of compounds having been reported. TiO2 has many advantages over other semiconductors, it is highly photoreactive, cheap, non-toxic, chemically and biologically inert, and photostable. The photocatalytic activity of TiO2 has been shown to depend upon many criteria including the ratio of anatase/rutile crystal phase, particle size and oxidation state. This paper reports the use of optical surface second harmonic generation (SSHG) to monitor modifications in TiO2 powder induced following laser treatment. SSHG is a non-contact, non-destructive technique, which is highly sensitive to both surface chemical and physical changes. Results show that three different SSH intensities were observable as the TiO2 samples were irradiated with the laser light. These regions were related to changes in chemical characteristics and particle size of the TiO2 powder.

Citation

VRILLET, G., LEE, S.K., McSTAY, D. and ROBERTSON, P.K.J. 2004. On-line monitoring of laser modification of titanium dioxide using optical surface second harmonic. Applied surface science [online], 222(1-4), pages 33-42. Available from: https://doi.org/10.1016/j.apsusc.2003.07.003

Journal Article Type Article
Acceptance Date Jan 31, 2004
Online Publication Date Jan 31, 2004
Publication Date Jan 31, 2004
Deposit Date Jul 2, 2010
Publicly Available Date Jul 2, 2010
Journal Applied surface science
Print ISSN 0169-4332
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 222
Issue 1-4
Pages 33-42
DOI https://doi.org/10.1016/j.apsusc.2003.07.003
Keywords Photocatalysis; TiO2; Surface second harmonic generation; Laser treatment; Colour change; Structure change
Public URL http://hdl.handle.net/10059/496

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