Controlled Synthesis of GaN@SiO2 Particles in Preventing the Hydrolysis of GaN

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• 作者：Keyan Bao ; Ge Guo ; Lianfeng Zhang ; Ruoyu Liu ; Hongxian Sun ; Zhiguo Zhong
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：July 14, 2011
• 年：2011
• 卷：115
• 期：27
• 页码：13200-13206
• 全文大小：983K
• 年卷期：v.115,no.27(July 14, 2011)
• ISSN：1932-7455

文摘

GaN small particles are sensitive to water molecules and easily hydrolyzed into GaOOH when exposed to atmosphere. One of the perfect solutions is to coat them with SiO₂, which serves as a protective layer against adsorption of water molecules on the GaN surface and effectively prevents the hydrolysis of GaN. Herein, the synthesis of GaN@SiO₂ with morphologies of microrhombuses and microrods is demonstrated. The products of GaN@SiO₂ were characterized by XRD, indicating that there was almost no hydrolysis of GaN@SiO₂ after one year exposition in the air. The photoluminescence (PL) of GaN microrhombuses and microrods exhibited emission peaks in the blue region, as did the GaN@SiO₂ products. The luminescence intensity increased after SiO₂ coating, while the PL position was not shifted. The silica shell effectively prevented the hydrolysis of GaN and successfully preserved the luminescence properties of GaN microrhombuses and microrods.