Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/21196
Title: Structural and optical studies of Au doped titanium oxide films
Authors: Alves, E. 
Franco, N. 
Barradas, N. P. 
Nunes, B. 
Lopes, J. 
Cavaleiro, A. 
Torrell, M. 
Cunha, L. 
Vaz, F. 
Keywords: Ion Implantation; TiO2 films; Au nanoparticles; Rutherford Backscattering Spectrometry; Optical absorption
Issue Date: Feb-2012
Publisher: Elsevier
Citation: ALVES, E. [et al.] - Structural and optical studies of Au doped titanium oxide films. "Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms". ISSN 0168-583X. Vol. 272 (2012) p. 61-65
Serial title, monograph or event: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
Volume: 272
Abstract: Thin films of TiO2 were doped with Au by ion implantation and in situ during the deposition. The films were grown by reactive magnetron sputtering and deposited in silicon and glass substrates at a temperature around 150 °C. The undoped films were implanted with Au fluences in the range of 5 × 1015 Au/cm2–1 × 1017 Au/cm2 with a energy of 150 keV. At a fluence of 5 × 1016 Au/cm2 the formation of Au nanoclusters in the films is observed during the implantation at room temperature. The clustering process starts to occur during the implantation where XRD estimates the presence of 3–5 nm precipitates. After annealing in a reducing atmosphere, the small precipitates coalesce into larger ones following an Ostwald ripening mechanism. In situ XRD studies reveal that Au atoms start to coalesce at 350 °C, reaching the precipitates dimensions larger than 40 nm at 600 °C. Annealing above 700 °C promotes drastic changes in the Au profile of in situ doped films with the formation of two Au rich regions at the interface and surface respectively. The optical properties reveal the presence of a broad band centered at 550 nm related to the plasmon resonance of gold particles visible in AFM maps.
Description: Proceedings of the 17th International Conference on Ion Beam Modification of Materials (IBMM 2010)
URI: http://hdl.handle.net/10316/21196
ISSN: 0168-583X
DOI: 10.1016/j.nimb.2011.01.033
Rights: openAccess
Appears in Collections:I&D CEMUC - Artigos em Revistas Internacionais
FCTUC Eng.Mecânica - Artigos em Revistas Internacionais

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