Impact of Various Input Parameters on the Preparation of Different AlN Nanostructures by Hybrid Route of Hydrothermal and Carbothermal Reduction Nitridation Technique

Aluminum nitride (AlN) nanopowders with different morphologies were prepared using a hybrid hydrothermal and carbothermal reduction nitridation technique. The impact of pyrolysis on the preparation of AlN nanopowders was examined. The effect of different input parameters, such as the molar ratio of urea/alumina, hydrothermal reaction conditions, and nitridation temperatures, on the formation of AlN nanostructures were studied. The hydrothermal treatment yielded the boehmite precursor under different reaction conditions (temperature 180–220 ℃ and time 12–24 h), which was used to convert the AlN nanostructures by nitridation (temperature 1400–1600 ℃ for 4 h). The structure and morphology of the resulting powders were examined by X-ray diffraction and scanning electron microscopy, respectively. Microspheres, nanoparticles, and plate-like structures were achieved under different reaction conditions, and the influencing factors were discussed in detail. Uniform and monodispersed AlN nanoparticles approximately 73 nm in size were obtained by nitridation temperature at 1500 ℃ for 4 h.