Vertically aligned one-dimensional AlN nanostructures on conductive substrates: Synthesis and field emission

► AlN nanocone arrays are promising field emitters. ► The substrates cannot influence the morphologies of AlN products. ► AlN products can evolve from cone-like to rod-like geometries with temperature. ► AlN nanocones on conductive substrate show better field emission properties. ► Better performance arising from better electrical contact.