Structure Controlled Growth of Single-walled Carbon Nanotubes
Structure Controlled Growth of Single-walled Carbon Nanotubes
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发表时间：
2012
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通讯作者：
S. Chiashi;Taiki Inoue;Norihiro Hiramatsu;D. Hasegawa;Kenta Nakamura;S. Maruyama
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作者：
S. Chiashi;Taiki Inoue;Norihiro Hiramatsu;D. Hasegawa;Kenta Nakamura;S. Maruyama
摘要单壁碳纳米管（SWNT）是一种卷曲的石墨烯。由于它们的一维性，它们表现出独特的性质，并且它们的性质取决于它们的结构。尽管结构控制对于单壁碳纳米管的许多应用是重要的，但是在其生长阶段对其进行控制仍然是困难的。本文介绍了单壁碳纳米管的直径和方向控制生长技术。单壁碳纳米管是通过醇催化化学气相沉积（ACCVD）方法合成的[1]。CVD温度和时间分别为900 ℃和10分钟。对于管直径控制，使用纳米金刚石颗粒作为SWNT催化剂[2]。图1显示了由纳米金刚石合成的SWNT的SEM图像和拉曼散射光谱。金刚石在高温下是稳定的。因此，预先控制直径的纳米金刚石颗粒可以生长直径受控的SWNT。在方向控制的情况下，我们使用R面（101）和R切割石英衬底[3]，它们清楚地表现出台阶和平台结构，如图2（A）所示。单壁碳纳米管在这些基底上沿沿着x轴水平排列（图2（B）），这表明石英（101）晶体表面的原子结构导致单壁碳纳米管排列。
Abstract Single-walled carbon nanotube (SWNT) is a rolled up graphene. They exhibit unique properties due to their one-dimensionality, and their properties depend on their structure. Although structure control is important for many applications of SWNTs, it is still difficult to control it in their growth stage. In this paper, we showed the diameter and direction controlled growth techniques of SWNTs. SWNTs were synthesized by using alcohol catalytic chemical vapor deposition (ACCVD) method [1]. The CVD temperature and time were 900 C and 10 minutes, respectively. For tube diameter control, nano-diamond particles were used as SWNT catalyst [2]. Figure 1 showed SEM image and Raman scattering spectra of the synthesized SWNTs from nano-diamond. Diamond is stable at high temperature. Therefore, it is possible that nano-diamond particles, which are controlled in diameter in advance, grow diameter-controlled SWNTs. In the case of direction control, we used R-face (101) and R-cut quartz substrates [3], which clearly exhibit step and terrace structure, as shown in Fig. 2(A). SWNTs were horizontally aligned on these substrate along the x-axis (Fig. 2(B)), which indicated that the atomic structure of (101) crystallographic surface of quartz caused the SWNTs to align.