|Posted: Sep 19, 2017|
Novel strategy for chirality controlled synthesis of single-walled carbon nanotubes(Nanowerk News) Researchers at Tohoku University have developed a novel strategy for controlling chirality of single-walled carbon nanotubes (SWNTs). By using this approach, preferential synthesis of (6,4) SWNTs has been realized for the first time (Scientific Reports, "Preferential synthesis of (6,4) single-walled carbon nanotubes by controlling oxidation degree of Co catalyst").
|The unique growth mechanism has been elucidated through comparing experiments and theoretical calculations made with a researcher from the University of Tokyo.|
|(6,4) This is SWNTs grown by oxidation-degree control of Co catalyst. (Image: Toshiaki Kato)|
|Chirality-selective synthesis of single-walled carbon nanotubes (SWNTs) has been a research goal for the last two decades and is still challenging due to the difficulty in controlling the atomic structure in the one-dimensional material.|
|Led by Associate Professor T. Kato, the team demonstrated predominant synthesis of (6,4) SWNTs by tuning the oxidation degree of the Co catalyst. The detailed mechanism is investigated through a systematic experimental study combined with first-principle calculations, revealing that the independent control of tube diameter and chiral angle achieved by changing the binding energy between SWNTs (cap and tube edge) and catalyst causes a drastic transition of chirality of SWNTs from (6,5) to (6,4).|
|"Since our approach of independently controlling the diameter and chiral angle can be applied to other chirality species, our results can be useful in achieving the on-demand synthesis of specific-chirality SWNTs. This is, which is necessary for the practical use of SWNTs-based future devices such as ultra-high performance transistors, electrical and optical memories, and various sensor applications," says Kato.|
|"High purity synthesis of (6,4) SWNTs can contribute to pushing the study of SWNTs to industrial -- especially optoelectrical -- applications due to the largest band gap and highest quantum yields of (6,4) SWNTs."|
|Source: Tohoku University|
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