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Mechanochemical route to the synthesis of nanostructured Aluminium nitride

机译:机械化学途径合成纳米结构氮化铝

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摘要

Hexagonal Aluminium nitride (h-AlN) is an important wide-bandgap semiconductor material which is conventionally fabricated by high temperature carbothermal reduction of alumina under toxic ammonia atmosphere. Here we report a simple, low cost and potentially scalable mechanochemical procedure for the green synthesis of nanostructured h-AlN from a powder mixture of Aluminium and melamine precursors. A combination of experimental and theoretical techniques has been employed to provide comprehensive mechanistic insights on the reactivity of melamine, solid state metal-organic interactions and the structural transformation of Al to h-AlN under non-equilibrium ball milling conditions. The results reveal that melamine is adsorbed through the amine groups on the Aluminium surface due to the long-range van der Waals forces. The high energy provided by milling leads to the deammoniation of melamine at the initial stages followed by the polymerization and formation of a carbon nitride network, by the decomposition of the amine groups and, finally, by the subsequent diffusion of nitrogen into the Aluminium structure to form h-AlN.
机译:六方氮化铝(h-AlN)是一种重要的宽带隙半导体材料,通常是通过在有毒氨气气氛下通过高温碳热还原氧化铝来制造的。在这里,我们报告了一种简单,低成本和潜在可扩展的机械化学方法,用于从铝和三聚氰胺前体的粉末混合物中绿色合成纳米结构的h-AlN。实验和理论技术的结合已被用于提供关于三聚氰胺的反应性,固态金属-有机相互作用以及在非平衡球磨条件下Al向h-AlN的结构转变的综合力学见解。结果表明,由于长程范德华力的作用,三聚氰胺通过铝表面的胺基团被吸附。研磨提供的高能量会导致三聚氰胺在初始阶段脱氨,随后聚合并形成氮化碳网络,通过胺基的分解,最后通过氮随后扩散到铝结构中形式为h-AlN。

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