Flower-like aluminium nitride nanostructures deposited by rf magnetron sputtering on superhard rhodium boride films

In this work, we demonstrate the feasibility to obtain aluminium nitride (AlN) nanostructures by radio frequency magnetron sputtering technique. In particular, nanostructured flower-like morphologies are achieved through a direct growth of AlN films on superhard rhodium boride (RhB) layers deposited by means of pulsed laser deposition (PLD) technique. AlN is deposited at different substrate temperatures in the range 300-500 degrees C in order to investigate the effects on morphology and crystalline structure. The samples are characterized by field emission scanning electron microscopy, atomic force microscopy, X-ray diffraction analysis and photoluminescence measurements. Results reveal nanostructured flower-like morphology of AlN for samples grown at different temperatures, while the smoothing of flower-petals with the increasing of temperature is observed. X-ray diffraction analysis indicate that the (002) crystallographic texture of the samples decreased upon the increase of the deposition temperature and only for the sample deposited at 300 degrees C a strong c-axis orientation is obtained.