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Single-crystalline MgAl_2O_4 spinel nanotubes using a reactive and removable MgO nanowire template

机译:使用反应性和可移动MgO纳米线模板的MgAl_2O_4尖晶石单晶纳米管

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摘要

Using MgO nanowires as a reactive template, we fabricated for the first time single-crystal MgAl_2O_4 spinel nanotubes through an interfacial solid-state reaction of MgO-Al_2O_3 core-shell nanowires. Single-crystal MgO nanowires are coated with a conformal thin layer of amorphous Al_2O_3 via atomic layer deposition. Subsequent annealing at 700 deg C activates the interfacial reaction between MgO and Al_2O_3, transforming the alumina shell into a spinel shell. Finally, after etching away the remaining MgO core in ammonia sulfuric solution, MgAl_2O_4 spinel nanotubes are obtained. As a transition from conventional planar spinel layers via thin-film interface reactions, our result might open a window for the fabrication of a wide variety of MgO-based spinel one-dimensional nanostructures.
机译:以MgO纳米线为反应模板,通过MgO-Al_2O_3核-壳纳米线的界面固态反应,首次制备了MgAl_2O_4尖晶石单晶纳米管。单晶MgO纳米线通过原子层沉积涂覆有非晶Al_2O_3的保形薄层。随后在700摄氏度下退火会激活MgO和Al_2O_3之间的界面反应,从而将氧化铝壳转变为尖晶石壳。最后,在氨硫酸溶液中蚀刻掉剩余的MgO核之后,获得MgAl_2O_4尖晶石纳米管。作为从常规平面尖晶石层通过薄膜界面反应的过渡,我们的结果可能为制造各种基于MgO的尖晶石一维纳米结构打开一个窗口。

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