CEA Saclay, IRAMIS, Laboratoire Interdisciplinaire sur l'Organisation Nanométrique et Supramoléculaire, 91191 Gif-sur-Yvette cedex, France.
J Am Chem Soc. 2012 Feb 29;134(8):3780-6. doi: 10.1021/ja209756j. Epub 2012 Feb 13.
It is known that silicon can be successfully replaced by germanium atoms in the synthesis of imogolite nanotubes, leading to shorter and larger AlGe nanotubes. Beside the change in morphology, two characteristics of the AlGe nanotube synthesis were recently discovered. AlGe imogolite nanotubes can be synthesized at much higher concentrations than AlSi imogolite. AlGe imogolite exists in the form of both single-walled (SW) and double-walled (DW) nanotubes, whereas DW AlSi imogolites have never been observed. In this article, we give details on the physicochemical control over the SW or DW AlGe imogolite structure. For some conditions, an almost 100% yield of SW or DW nanotubes is demonstrated. We propose a model for the formation of SW or DW AlGe imogolite, which also explains why DW AlSi imogolites or higher wall numbers for AlGe imogolite are not likely to be formed.
已知在合成埃洛石纳米管时，硅可以被锗原子成功取代，从而得到更短更大的 AlGe 纳米管。除了形态的变化，最近还发现了 AlGe 纳米管合成的两个特点。与 AlSi 埃洛石相比，AlGe 埃洛石可以在更高的浓度下合成。AlGe 埃洛石以单壁 (SW) 和双壁 (DW) 纳米管的形式存在，而 DW AlSi 埃洛石从未被观察到。在本文中，我们详细介绍了对 SW 或 DW AlGe 埃洛石结构的物理化学控制。对于某些条件，证明了 SW 或 DW 纳米管的产率几乎达到 100%。我们提出了一个形成 SW 或 DW AlGe 埃洛石的模型，该模型还解释了为什么不可能形成 DW AlSi 埃洛石或更高壁数的 AlGe 埃洛石。
