Controllable synthesis of Y doped AlN microtubes, prism-arrayed microstructures and microflowers via an improved DC arc discharge plasmai method

摘要

The yttrium doped AlN (AlN:Y) microtubes, prism arrayed microstructures and microflowers were fabricated through the direct reaction of Al:Y alloy and N-2 without extra catalyst. AlN microstructures can be controlled by varying deposition temperature or changing deposition area. The structure and morphology of AlN:Y microstructures were characterized by X-ray diffraction, scanning and transmission electron microscopy and Raman spectroscopy. The results indicate that Y3+ ions incorporate inside the AlN nanostructures. The photoluminescence spectra of the AlN:Y microstructures show strong defect-induced emissions in the visible range of 400-750 nm. Room-temperature ferromagnetism is observed in AlN:Y microstructures which is caused by high concentration of Al vacancies. The AlN:Y microstructures with interesting geometries possess excellent optical and magnetic properties, suggesting potential applications in optoelectronic and spintronic mlcrodevices.