Nikolaev Pavel, Holmes William, Sosa Edward, Boul Peter, Arepalli Sivaram, Yowell Leonard
ERC Inc./NASA Johnson Space Center, Mail Stop ES-4, P.O. Box 58561, Houston, TX 77258, USA.
J Nanosci Nanotechnol. 2010 Jun;10(6):3780-9. doi: 10.1166/jnn.2010.2008.
Pulsed laser vaporization synthesis of single-wall carbon nanotubes on Co/Ni and Rh/Pd catalysts was explored with respect to variations in the production temperature. The nanotube type populations were determined via photoluminescence, UV-Vis-NIR absorption and Raman spectroscopy. It was found that lowered production temperature leads to smaller nanotube diameters and exceptionally narrow (n, m) type distributions, with marked preference towards large chiral angles for both catalysts. Interestingly, larger nanotube diameters tend to be associated with larger chiral angles. These results demonstrate that PLV production technique can provide at least partial control over the nanotube (n, m) populations. In addition, these results have implications for the understanding the nanotube nucleation mechanism in the laser oven. SWCNT synthesized at lower temperatures appear quite attractive as a starting material for nanotube type separation experiments.
研究了在Co/Ni和Rh/Pd催化剂上，通过脉冲激光蒸发合成单壁碳纳米管时，生产温度变化对其的影响。通过光致发光、紫外-可见-近红外吸收和拉曼光谱确定了纳米管类型的分布情况。研究发现，较低的生产温度会导致纳米管直径变小，且（n，m）类型分布异常狭窄，两种催化剂都明显倾向于较大的手性角。有趣的是，较大的纳米管直径往往与较大的手性角相关。这些结果表明，脉冲激光蒸发生产技术可以至少部分地控制纳米管（n，m）的分布。此外，这些结果对于理解激光炉中纳米管的成核机制具有重要意义。在较低温度下合成的单壁碳纳米管作为纳米管类型分离实验的起始材料显得颇具吸引力。
