Research on Precursors of Carbon Nanotubes for Control of Layer Numbers

碳纳米管前驱体控制层数的研究

基本信息

批准号：
16510074
负责人：
SUGAI Toshiki
金额：
$ 2.56万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16510074/
关键词：
high-temperature pulsed arc discharege high-quality double wall carbon nanotubes precursors Layer number control electronic states layer interaction ion mobility 高品質2層カーボンナノチューブ 2層ナノチューブ超高温パルスアーク放電装置

项目摘要

We have succeeded to produce and purify high-quality double wall carbon nanotubes (HQDWNTs) with low diameter distribution and very few defects by a newly developed high-temperature pulsed arc discharge method. The diameter distribution of HQDWNTs is 1.6〜2.0 nm for the outer diameter, which is one of the narrowest double wall carbon nanotubes at this moment. These HQDWNTs have inter layer interaction, which does not exit in normal single-wall carbon nanotubes (SWNTs), and have novel properties coming from the layer interaction. For the atomic level structures, HQDWNTs have correlation between the inner and the outer layers. We have found that chiral helicities of the inner and the outer layers tend to have the same ones, that is, both layers have right handed or left handed structures, and that there are locally commensurate graphen stacking between the layers. The structural correlations have not been observed with other DWNTs since their structural uniformity and the graphitization of the wall are not good enough for the observations. Furthermore, transport properties of field effect transistors using HQDWNTs as channels also show the special ambipolar properties, which also come from layer interaction and structural uniformity of HQDWNTs. Now STM observation to investigate the layer interaction and details of electronic properties are in progress.As shown previously, we have succeeded to control the number of layers of SWNTs and DWNTs and to reveal the novel properties of DWNTs, which come from the layer interaction. Further researches are in progress to develop a control method for the numbers of layers by monitoring the precursors of carbon nanotubes with ion mobility method. The numbers of layers are determined very early stages of nanotubes growth in the time range of ms. The ion mobility measurements are suitable for the measurements since they are much faster than traditional methods like TEM, AFM and STM.

我们通过新开发的高温脉冲电弧放电方法，成功生产和纯化了低直径分布、极少缺陷的高质量双壁碳纳米管（HQDWNT），HQDWNT的外径分布为1.6~2.0 nm。直径，是目前最窄的双壁碳纳米管之一，这些HQDWNT具有普通单壁碳纳米管中不存在的层间相互作用。（SWNT），并且具有来自层相互作用的新颖特性，对于原子级结构，HQDWNT 在内层和外层之间具有相关性，我们发现内层和外层的手性螺旋往往具有相同的。，也就是说，两个层都具有右手或左手结构，并且层之间存在局部相称的石墨烯堆叠，因为其他 DWNT 的结构均匀性和石墨化，尚未观察到结构相关性。此外，使用HQDWNT作为通道的场效应晶体管的传输特性也表现出特殊的双极性特性，这也来自于HQDWNT的层间相互作用和结构均匀性，现在通过STM观察来研究层间相互作用和细节。如前所述，我们已经成功地控制了 SWNT 和 DWNT 的层数，并揭示了 DWNT 的新特性，这些特性来自于层间相互作用。正在开发一种通过用离子淌度法监测碳纳米管前体来控制层数的方法，层数是在纳米管生长的早期阶段在毫秒的时间范围内确定的。因为它们比 TEM、AFM 和 STM 等传统方法快得多。