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Synthesis of ZnO nanostructures with different morphologies by a direct melt oxidation of Al-Zn mixture

机译：Al-Zn混合物的直接熔融氧化合成不同形态的ZnO纳米结构

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摘要

ZnO nanostructures with different morphologies were synthesized through a direct melt oxidation of source materials mixed with Al and Zn in air at atmospheric pressure. When Al-Zn mixture was used as a source material, tetrapod-shaped ZnO nanostructures were formed. ZnO nanostructures with bottle and tubular shape were fabricated when Al-Zn source material contained Au. The morphology depended on the Au content in Al-Zn source material. In addition, when carbon was contained in Al-Zn source material, ZnO nanostructures with comb shape were observed after the oxidation of the source material. All the ZnO nanostructures showed a hexagonal wurtzite crystallographic structure and were grown along the [0001] direction. On the other hand, the green emission centered at 510 nm was detected for all the ZnO nanostructures. This suggests that the ZnO nanostructures had high density of oxygen vacancies, which is supposed to be ascribed from high density of surface and subsurface oxygen vacancies in the nanostructures.
机译：通过在大气压力下将铝和锌混合的原料直接熔融氧化，可以合成具有不同形态的ZnO纳米结构。当Al-Zn混合物用作原料时，形成四脚形的ZnO纳米结构。当Al-Zn源材料中含有Au时，可制得瓶状和管状的ZnO纳米结构。形态取决于Al-Zn源材料中的Au含量。另外，当在Al-Zn原料中包含碳时，在原料氧化之后观察到具有梳状的ZnO纳米结构。所有的ZnO纳米结构均显示六方纤锌矿晶体结构，并沿[0001]方向生长。另一方面，对于所有的ZnO纳米结构，检测到以510nm为中心的绿色发射。这表明ZnO纳米结构具有高的氧空位密度，这被认为是由于纳米结构中的表面和亚表面氧空位的高密度。

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