Crystal Plane Dependent Growth of Aligned Single-Walled Carbon Nanotubes on Sapphire

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• 作者：Naoki Ishigami ; Hiroki Ago ; Kenta Imamoto ; Masaharu Tsuji ; Konstantin Iakoubovskii ; Nobutsugu Minami
• 刊名：Journal of the American Chemical Society
• 出版年：2008
• 出版时间：July 30, 2008
• 年：2008
• 卷：130
• 期：30
• 页码：9918-9924
• 全文大小：546K
• 年卷期：v.130,no.30(July 30, 2008)
• ISSN：1520-5126

文摘

On single-crystal substrates, such as sapphire (α-Al₂O₃) and quartz (SiO₂), 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 SiO₂. 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.