Solvent Engineering for Shape-Shifter Pure Fullerene (C60)
Solvent Engineering for Shape-Shifter Pure Fullerene (C60)
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DOI：
10.1021/ja902061r
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发表时间：
2009-05-13
影响因子：
15
通讯作者：
Ariga, Katsuhiko
中科院分区：
文献类型：
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作者：
Sathish, Marappan;Miyazawa, Kun'ichi;Ariga, Katsuhiko
作为一种备受期待的自下而上的纳米技术，即纯功能分子的形状控制，我们报告了通过依赖于溶剂的晶体变化，控制形成二维(2D)对象，如六边形和菱形，以及它们选择性的形状转变为一维(1D)棒。晶格，全部由纯C-60制成。在叔丁醇/甲苯和异丙醇/CCl4界面分别得到了均一的菱形和六边形结构。此外，将这些2D纳米片暴露在水中，可以诱导其选择性地转变为一维纳米棒。纳米晶在水中暴露后会转化为短纳米棒。这种形状转变伴随着晶体结构的变化，从面心立方/六方混合，到纯的面心立方晶格，后者与形态相似的C-60纳米晶须几乎相同。亚稳态纳米晶具有应变的混合晶体结构，变形为更稳定的短纳米晶须(纳米棒)。相比之下，单一晶格的稳定纳米六边形(因此应变较小)不会发生形状变化。这些结果清楚地证明了各种形状(六边形、菱形等)的2D纳米薄片的可控形成。以及通过非常简单的溶剂处理从纯C-60分子选择性地将形状转变为纳米棒(短纳米晶须)。
As a highly anticipated technique for bottom-up nanotechnology, i.e., shape control of pure functional molecules, we here report controlled formation of two-dimensional (2D) objects such as hexagons and rhombi and their selective shape shifting into one-dimensional (1D) rods through solvent-dependent changes of crystal. lattice, all from pure C-60. Uniformly shaped rhombi and hexagons were obtained at tert-butyl alcohol/toluene and i-propyl alcohol/CCl4, interfaces, respectively. In addition, exposure of these 2D nanosheets to water induced selective transformation into 1 D nanorods. Nanorhombi were converted to short nanorods upon exposure to water. This shape shift is accompanied by changes in crystalline structures from a mixed fcc/hexagonal, to pure fcc lattice, the Latter of which is almost identical with morphologically similar C-60 nanowhiskers. Metastable nanorhombi which possess a strained mixed crystalline structure metamorphosize into the more stable short nanowhisker (nanorods). In contrast, the stable nanohexagon of a single lattice (and so less strain) does not undergo shape shifting. These results clearly demonstrate controlled formation of 2D nanosheets with various shapes (hexagons, rhombi, etc.) and selective shape shifting to nanorods (short nanowhiskers) all from pure C-60 molecules by very simple solvent treatments.