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A possible role of the dipole moment of the catalyst droplet in nanotube growth, alignment, chirality, and characteristics

机译：催化剂液滴的偶极矩对纳米管生长，排列，手性和特性的可能作用

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Why vapor species land on the surface of the nanoparticle seed for nanotube synthesis is a vital question. An investigation has been carried out to find an answer to it. For this, a model of the dipole moment has been developed. A bimetallic alloy (non-alloy, solid solution) exhibiting the shape of a cap has been assumed to function as the nanoparticle seed. Various features of the dipole moment have been examined. The influence of the dipole moment on nanotube synthesis, alignment, chirality, and characteristics has also been studied. Available experiments on the synthesis of carbon nanotubes employing bimetallic catalysts have been compared with the results from calculations. Close correspondence between the two demonstrates that the catalysts may exhibit a dipole moment and have a crucial role in nanotube synthesis and characteristics. The dipole moment has also been employed to determine why some nanotubes grow vertically, while others are bent. Calculated results appear to explain the basic causes for this. These results suggest that the electric field resulting from the dipole moment of catalysts may be important for the vertical alignment of nanotubes. They may attest to the validity of the model and to the existence of a dipole moment in seeds. Although considered for nanotube syntheses, the results may be applicable to other nanomaterials (nanotubes, nanowires, nanodots).
机译：为什么蒸气物质降落在用于纳米管合成的纳米粒子种子的表面上是一个至关重要的问题。已经进行了调查以找到答案。为此，已经开发了偶极矩模型。呈现出盖形状的双金属合金（非合金，固溶体）被假定为充当纳米粒子种子。已经研究了偶极矩的各种特征。还研究了偶极矩对纳米管合成，排列，手性和特性的影响。使用双金属催化剂合成碳纳米管的可用实验已与计算结果进行了比较。两者之间的密切对应关系表明，催化剂可能表现出偶极矩，并且在纳米管的合成和特性中起着至关重要的作用。偶极矩也已被用来确定为什么某些纳米管垂直生长，而另一些则弯曲。计算结果似乎可以解释其基本原因。这些结果表明，由催化剂的偶极矩产生的电场对于纳米管的垂直排列可能很重要。他们可以证明该模型的有效性以及种子中偶极矩的存在。尽管考虑用于纳米管合成，但该结果可能适用于其他纳米材料（纳米管，纳米线，纳米点）。

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    《Nanotechnology》 |2012年第8期|共13页
  • 作者

    Mohammad S.N.;

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