Template synthesis of precisely monodisperse silica nanoparticles within self-assembled organometallic spheres.
Template synthesis of precisely monodisperse silica nanoparticles within self-assembled organometallic spheres.
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DOI：
10.1038/nchem.446
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发表时间：
2010
期刊：
影响因子：
21.8
通讯作者：
Kosuke Suzuki;Sota Sato;M. Fujita
中科院分区：
文献类型：
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作者：
Kosuke Suzuki;Sota Sato;M. Fujita
材料科学中的关键挑战之一是以高精度控制无机纳米颗粒的尺寸和形状，因为这些参数对纳米颗粒的性质和潜在应用具有显著影响。在这里，我们描述了高度单分散的二氧化硅纳米粒子的直径小于5 nm的制备通过使用自组装，中空，球形化合物作为“内模板”。这些配位络合物与侧糖基内衬其邻体组装从12个金属离子和24个双吡啶基配体含有葡萄糖取代基作为结构明确的模板烷氧基硅烷的溶胶-凝胶缩合。用该方法制备的二氧化硅纳米粒子的多分散性接近统一，Mw/Mn< 1.01。组分配体很容易修饰，这使得配位复合物能够准确膨胀，并随后控制分子量范围为5，000至31，000 Da（对应于直径2-4 nm）的单分散二氧化硅纳米颗粒。该方法也适用于其他无机纳米粒子的制备。
One of the key challenges in materials science is to control the size and shape of inorganic nanoparticles with a high degree of precision, as these parameters have a significant influence on the nanoparticles' properties and potential applications. Here, we describe the preparation of highly monodisperse silica nanoparticles smaller than 5 nm in diameter by using self-assembled, hollow, spherical compounds as ‘endo-templates’. These coordination complexes with pendant sugar groups lining their interiors—assembled from 12 metal ions and 24 bis-pyridyl ligands containing glucose substituents—acted as structurally well-defined templates for the sol–gel condensation of alkoxysilanes. The polydispersities of the silica nanoparticles made with this method approached unity, withMw/Mn< 1.01. The component ligands are modified easily, which enables an accurate expansion of the coordination complex and the subsequent control of the monodisperse silica nanoparticles that span molecular weights of 5,000 to 31,000 Da (corresponding to 2–4 nm in diameter). This method could be applicable to the preparation of other inorganic nanoparticles.