排序方式: 共有3条查询结果,搜索用时 15 毫秒
1
1.
2.
Thurakitseree T Einarsson E Xiang R Zhao P Aikawa S Chiashi S Shiomi J Maruyama S 《Journal of nanoscience and nanotechnology》2012,12(1):370-376
In this study, we systematically investigated the influence of catalyst preparation procedures on the mean diameter of single-walled carbon nanotubes (SWNTs) synthesized by the alcohol catalytic chemical vapor deposition (ACCVD) process. It was found that the SWNT diameter is dependent upon both reduction temperature and time, with lower reduction temperature and/or shorter reduction time resulting in smaller diameter SWNTs. The morphology of the SWNTs also changed from vertically aligned to randomly oriented when the reduction temperature was below 500 degrees C. We also found that introducing a small amount of water during the catalyst reduction stage significantly decreased the mean diameter of the SWNTs. Lastly, we report on the use of a new binary catalyst system in which rhodium was combined with cobalt. This new Co/Rh combination produced SWNTs of smaller diameter than the conventional Co/Mo catalyst. 相似文献
3.
Theerapol Thurakitseree Christian Kramberger Pei Zhao Shinya Aikawa Sivasankaran Harish Shohei Chiashi Erik Einarsson Shigeo Maruyama 《Carbon》2012,50(7):2635-2640
Diameter controlled and vertically aligned single-walled carbon nanotubes were synthesized from pure and mixed ethanol/acetonitrile feedstock. With increasing acetonitrile concentration in the feedstock, nitrogen incorporation into the sp2 carbon network increased until saturating at approximately one atomic percent. The incorporation of nitrogen correlates with a significant diameter reduction from a mean diameter of 2.1 nm down to 0.7 nm. Heteroatom-mediated diameter control is independent of catalyst preparation and represents a versatile tool for the direct synthesis of tailored single-walled carbon nanotubes. 相似文献
1