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首页> 外文期刊>Crystal growth & design >Template-free synthesis of highly uniform alpha-GaOOH spindles and conversion to alpha-Ga2O3 and beta-Ga2O3
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Template-free synthesis of highly uniform alpha-GaOOH spindles and conversion to alpha-Ga2O3 and beta-Ga2O3

机译：高度均匀的α-GaOOH锭子的无模板合成以及转化为α-Ga2O3和β-Ga2O3

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Monodispersed single crystalline alpha-GaOOH spindles have been prepared via a simple wet-chemical route at 60 degrees C, in which GaCl3 was used as the gallium source and ammonia as the alkali. The alpha-GaOOH spindles obtained at pH values of 10.0 and 11.0 have a hierarchical layered nanostructure and are comprised of many nanoplatelets. The investigation of the products formed at early growth stages indicates that the spindles are formed by a self-assembly process via oriented attachment. During this process, the pH value and the ammonia molecule have great influence on the morphology of the final products. Smooth prism-like alpha-GaOOH crystals were obtained at a lower pH value of 8.0 when ammonia was used or when ammonia was replaced by ethylenediamine at pH values of 8.0 and 10.0. The single-phase alpha-Ga2O3 and beta-Ga2O3 spindles can be obtained by thermal treatment of the alpha-GaOOH spindles at 600 and 900 degrees C, respectively. The morphological characteristics of the pristine alpha-GaOOH spindles are well maintained in the oxide products in terms of good dispersion, size uniformity and layered nanostructure. The beta-Ga2O3 spindle product exhibits a strong blue luminescence emission under the excitation wavelength of 250 nm.
机译：单分散的单晶α-GaOOH锭子是通过简单的湿化学路线在60摄氏度下制备的，其中使用GaCl3作为镓源，使用氨作为碱。在10.0和11.0的pH值下获得的alpha-GaOOH纺锤体具有分层的分层纳米结构，并且由许多纳米片组成。对在早期生长阶段形成的产品的研究表明，纺锤是通过定向装配的自组装过程形成的。在此过程中，pH值和氨分子对最终产物的形态有很大影响。当使用氨水或在pH值为8.0和10.0的条件下用乙二胺代替氨时，在较低的pH值为8.0时可获得光滑的棱柱状α-GaOOH晶体。通过分别在600和900摄氏度下对α-GaOOH纺锤进行热处理，可以获得单相α-Ga2O3和β-Ga2O3纺锤。就良好的分散性，尺寸均匀性和层状纳米结构而言，原始α-GaOOH纺锤的形态特征在氧化物产品中得到了很好的维护。 β-Ga2O3纺锤体产物在250 nm的激发波长下显示出强烈的蓝色发光。

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