Single-Walled Carbon Nanotube Growth in High Vacuum Using Pt Catalyst in Alcohol Gas Source Method
Single-Walled Carbon Nanotube Growth in High Vacuum Using Pt Catalyst in Alcohol Gas Source Method
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DOI：
10.1166/mex.2011.1046
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发表时间：
2011-12-01
影响因子：
0.7
通讯作者：
Iijima, Sumio
中科院分区：
文献类型：
--
作者：
Maruyama, Takahiro;Mizutani, Yoshihiro;Iijima, Sumio
采用乙醇气源法在高真空条件下，以铂为催化剂，在700℃的温度下在SiO_2/Si衬底上生长了单壁碳纳米管。扫描电子显微镜观察和拉曼光谱测量表明，最佳的乙醇压力为1×10(-4)Pa.这比在Co催化剂下生长单壁碳纳米管的压力小得多.不同激发波长下的拉曼光谱测量表明，在1×10~(-4)Pa的压力下，用铂催化剂生长的单壁碳纳米管的G/Si比比在1×10~(-1)Pa的Co催化剂下生长的多壁碳纳米管大得多，这表明尽管乙醇压力较低，但前者的单壁碳纳米管的产率高于后者。这些结果表明，与传统的钴催化剂相比，使用铂催化剂可以显著降低乙醇的最佳压力。首次证明了铂催化剂在低压下生长单壁碳纳米管的有效性。
Growth of single-walled carbon nanotubes (SWNTs) was carried out on SiO2/Si substrates at 700 degrees C with Pt catalysts using an alcohol gas source method in a high vacuum. Scanning electron microscopy observations and Raman spectroscopy measurements showed the optimal ethanol pressure to be 1 x 10(-4) Pa, which was much smaller than that used in the SWNT growth with a Co catalyst. Raman spectra measured with various excitation wavelengths showed that the G/Si ratios of the SWNTs grown with the Pt catalyst at 1 x 10(-4) Pa was fairly larger than those grown with the Co catalyst at 1 x 10(-1) Pa, indicating that the SWNT yield of the former was higher than that of the latter, in spite of the lower ethanol pressure. These results indicate that by using the Pt catalyst, the optimal ethanol pressure was considerably reduced, compared to the conventional Co catalyst. The usefulness of Pt catalyst for SWNT growth under low pressure was demonstrated for the first time.