“…This, in turn, enables AlN to form a 1D morphology. As a result, a wide range of AlN-based 1D nanostructures have been successfully synthesized recently, such as nanowhiskers [10,14,15], nanowires [16], nanotubes [17], nanoneedles [18], nanocones [19], nanofibers [20], nanospheres [21,22], nanobelts [23], nanorods [24,25], nanotips [26], nanorings [27], and the hierarchical structures [28][29][30].…”