Crystal plane dependent growth of aligned single-walled carbon nanotubes on sapphire
Crystal plane dependent growth of aligned single-walled carbon nanotubes on sapphire
复制标题
DOI：
10.1021/ja8024752
复制
发表时间：
2008-07-30
影响因子：
15
通讯作者：
Minami, Nobutsugu
中科院分区：
文献类型：
--
作者：
Ishigami, Naoki;Ago, Hiroki;Minami, Nobutsugu
在蓝宝石(α-Al(2)O(3))和石英(SiO(2))等单晶衬底上，单壁碳纳米管(SWNT)沿晶体的特定晶轴排列，表明单壁碳纳米管的生长受晶体表面的影响。在这里，我们发现蓝宝石衬底的晶面不仅影响了单壁碳纳米管的取向，而且影响了其直径和手性。在蓝宝石的A和R面上生长的定向单壁碳纳米管的直径分布比在C面蓝宝石和无定形SiO(2)上生长的随机取向的单壁碳纳米管的直径分布要窄。光致发光测量表明，取向的单壁碳纳米管有一个显著的不同：在A平面上观察到近之字形的管子，而在R平面上观察到近扶手椅管。这项研究揭示了通过单晶衬底表面原子排列来控制单壁碳纳米管直径和手性的途径。
On single-crystal substrates, such as sapphire (alpha-Al(2)O(3)) and quartz (SiO(2)), single-walled carbon nanotubes (SWNTs) align along specific crystallographic axes of the crystal, indicating that the SWNT growth is influenced by the crystal surface. Here, we show that not only the orientation, but also the diameter and chirality of SWNTs are affected by the crystal plane of the sapphire substrate. The aligned SWNTs grown on the A- and R-planes of sapphire have narrower diameter distributions than randomly oriented tubes produced on the C-plane sapphire and amorphous SiO(2). Photoluminescence measurements reveal a striking difference between the aligned SWNTs: near-zigzag tubes are observed on the A-plane and near-armchair tubes on the R-plane. This study shows the route for the diameter and chirality control of SWNTs by surface atomic arrangements of a single-crystal substrate.