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

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journal contribution
posted on 2011-07-14, 00:00 authored by Keyan Bao, Ge Guo, Lianfeng Zhang, Ruoyu Liu, Hongxian Sun, Zhiguo Zhong
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.