Scalable preparation and characterization of GaN nanopowders with high crystallinity by soluble salts-assisted route

摘要

By using Na_3PO_4 as a dispersant, soluble salt-assisted route has been further developed to prepare high-crystalline GaN nanoparticles powder on a large scale through the direct nitridation of Ga-Na_3PO_4 mixture at 750-950 ℃ and followed by washing with water. The systematical characterizations including XRD, Raman, IR, TEM, XPS, and PL spectrum showed that the as-prepared nanopowders were composed of nanoparticles in diameters of 8-18 nm, hexagonal phase, pure GaN, and had a broad UV centered at 388 nm and blue emissions band centered at around 547 nm. Because of the utilization of the simple reaction between metallic Ga and NH_3, the preparation of pure GaN nanopowders becomes very easy, economical, and scalable, suggesting broad application in optoelectronic device material. The interesting results indicate the wide range of soluble salt-assisted route for promising industrial production of GaN nanopowders.