Abstract

Al 2O 3/TiO 2 bi-layer films on aluminium substrates have been obtained by combining anodising and TiO 2 sol–gel deposition. The reflectivity enhancing properties of these Al 2O 3/TiO 2 bi-layer films have been studied in relation to the refractive index and thickness of the Al 2O 3 and TiO 2 single-layers. It is shown that a significant improvement of reflectivity can be achieved by a proper optimisation of the bi-layer elaboration parameters.

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