Tailoring the morphology of AlN: from 6-fold patterned crystals to multilayer hierarchical structures

Abstract

Combustion of inorganic powder mixtures is not only one of the chemical routes of fabrication of advanced inorganic materials but is also drawing attention as a high-temperature process to grow inorganic nanocrystals of various shapes and morphology.

Morphological diversity of AlN nano- and microstructures: synthesis, growth orientations and theoretical modelling

“…Almost similar morphologies were reported in [136]. A number of 3D(2) structures were also prepared using combustion method [137]. A mixture of Al + k AlF 3 (or ZnF 2 ) + m NH 4 Cl composition was reacted under nitrogen pressure, and a cotton-like material consisting of various types of crystals was obtained.…”

“…These fragments can be classified as primary structures of the dendritic [127], (c) [128]) (d) [130]; B. 3D(1) structures: (a, b) [131], (c) [132] and (d) [133]; C. 3D(2) structures: (a) [135], (b) [136] (c, d, e) [137]. crystallisation process, in which the size of the smallest dendrites is ∼2-3 μm.…”

“…Other complex 3D structures of AlN include 6-fold symmetry crystals, as reported by Lee's group [137][138][139][140]. In order to determine the crystallographic growth directions, a 6-fold symmetry crystal was selected as shown in Figure 10(C, a) [137].…”

“…Other complex 3D structures of AlN include 6-fold symmetry crystals, as reported by Lee's group [137][138][139][140]. In order to determine the crystallographic growth directions, a 6-fold symmetry crystal was selected as shown in Figure 10(C, a) [137]. The microcrystal has relatively simple patterns, a central hexagonal tip, and six symmetrical branches.…”

“…3D(0) structures: (a) [126], (b)[127], (c)[128]) (d)[130]; B. 3D(1) structures: (a, b)[131], (c)[132] and (d)[133]; C. 3D(2) structures: (a)[135], (b)[136] (c, d, e)[137].…”