Preparation of Gallium Nitride Powders and Nanowires from a Gallium(III) Nitrate Salt in Flowing Ammonia

Bulletin of the Korean chemical society

Woo-Sik Jung¹ 

关键词: Gallium nitride;    Powder;    Nanowire;    Confined reactor;    71Ga MAS NMR;   

DOI  :  

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

Gallium nitride (GaN) powders were prepared by calcining a gallium(III) nitrate salt in flowing ammonia in the temperature ranging from 500 to 1050 ∑C. The process of conversion of the salt to GaN was monitored by X-ray diffraction and ⁷¹Ga MAS (magic-angle spinning) NMR spectroscopy. The salt decomposed to �?-Ga₂O₃ and then converted to GaN without �?- �? Ga₂O₃ phase transition. It is most likely that the conversion of �?-Ga₂O₃ to GaN does not proceed through Ga₂O but stepwise via amorphous gallium oxynitride (GaO_xN_y) as intermediates. The GaN nanowires and microcrystals were obtained by calcining the pellet containing a mixture of �?-Ga₂O₃ and carbon in flowing ammonia at 900 ∑C for 15 h. The growth of the nanowire might be explained by the vapor-solid (VS) mechanism in a confined reactor. Room-temperature photoluminescence spectra of as-synthesized GaN powders obtained showed the emission peak at 363 nm.

【 授权许可】

Unknown