Abstract
Single-crystalline AlN nanobelts, nanorings and branched nanostructures have been synthesized through a catalyst-free chemical vapor deposition (CVD) process employing Al power as starting material. The morphologies and microstructures of the as-prepared AlN nanostructures were characterized and it was found that the AlN nanobelts are well-crystallized with top/bottom surfaces of ±(0 0 1) planes of hexagonal AlN. The formation of AlN nanorings is accounted by the electrostatic polar charge model. The branched AlN nanostructures consist of nanobelt backbones and numerous nanorod branches which are all single crystals. The growth mechanism of the AlN nanostructures is discussed and a lateral secondary growth is suggested to address the formation of branched nanostructures. Photoluminescence (PL) spectrum of AlN nanobelts presents a defect-relative emission centered at 488 nm.
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