Abstract
This paper is focused on the structure, chemical composition, optical and mechanical properties of coatings consisting in an AlN matrix incorporating different Au contents (up to 2.5at.%). The Au was incorporated in the matrix atomically or in the form of very small nanoparticles (<1nm). With the increase in the Au content both the refractive index and the coefficient of extinction were increased. The AlN matrix presented a crystalline wurtzite phase, stable up to 1000°C.With annealing at 400°C the precipitation of XRD detectable Au nanoparticles was possible, originating SPR light absorption. The AlN+Au coatings exhibited hardness values between 15 and 24GPa, with no significant changes after the annealing treatments at low temperatures. These coatings are of interest to the decorative applications.
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