去合金化制备纳米片阵列和纳米球颗粒多孔锡

Dealloying preparation of nano-sheet arrays and nano-spherical particles of porous tin

摘要:

以Mg₈₉Sn₁₁(二元合金)为前驱体合金,在腐蚀介质中通过去合金化方法成功制备了纳米片阵列和纳米颗粒形貌的多孔锡。通过调整腐蚀介质和腐蚀时间研究了纳米多孔锡的形貌结构以及去合金化程度的影响因素。结果表明,在酸性腐蚀介质中去合金化,能够获得双连续结构的纳米多孔锡结构。其中,在0.1%H₃PO₄溶液中,孔壁由不连续的纳米球颗粒堆积而成,而在0.1mol/L HCl溶液中,孔壁为纳米片结构,形成了纳米片阵列的多孔锡；而在中性的NaCl溶液中,同样成功制备出了均匀的纳米片状阵列多孔锡。在5%的NaCl中,随着去合金化时间的延长,多孔形貌从均匀的纳米片阵列多孔转变为团簇状的纳米多孔形貌。去合金化1h时,表面形成了均匀的纳米片阵列多孔结构,6h后表面开始生成不连续的团簇状多孔形貌,并最终演化为连续起伏的片状纳米锡多孔结构,其孔径平均尺寸保持在50nm。通过对去合金化工艺进行调整,制备了不同形貌的纳米多孔锡结构。

Abstract:

Nanoporous tin with nanosheet arrays and nanoparticle were successfully prepared by dealloying in corrosion medium using Mg89Sn11 as precursor alloy. The morphology and structure of nanoporous tin and the process of dealloying were investigated by adjusting the corrosion medium and corrosion time. The results show that in acidic corrosive medium it can obtain a bicontinuous nanoporous tin structure. Among them, the pore walls are constituted by discontinuous nano-spherical particles in the 0.1% H₃PO₄ solution, while in the 0.1 mol/L HCl and neutral NaCl solution the pore walls are the nanosheet structure, forming a nanosheet array of porous tin. With the extension of the dealloying time, the porous morphology changes from a uniform nanosheet array porous to a cluster-like nanoporous morphology in 5% NaCl solution. The porous structure on the surface grows from uniform nanosheet array to discontinuous clusters with the corrosion time from 1h to 6h, and finally evolved into a continuous undulating sheet-like nanoporous structure with the average pore size of 50nm. Nano-porous tin structures with different morphologies were prepared by adjusting the dealloying process.