Effect of hydrogen on the growth and morphology of single wall carbon nanotubes synthesized on a FeMo/MgO catalytic system
- 作者：Alex ; ru R. Biris ; Zhongrui Li ; Enkeleda Dervishi ; Dan Lupu ; Yang Xu ; Viney Saini ; Fumiya Watanabe ; Alex ; ru S. Biris
- 关键词：Single wall carbon nanotubes ; Chemical vapor deposition ; Catalysis
- 刊名：Physics Letters A
- 出版年：2008
- 期刊代码：57_03759601
- 类别：ph
- 出版时间：21 April 2008
- 卷：372
- 期：17
- 页码：3051-3057
- 文件大小：785 K
摘要
Single wall carbon nanotubes were synthesized from thermal pyrolysis of methane on a Fe
Mo/MgO catalyst by radio frequency catalytic chemical vapor deposition (RF-CVD) using argon as a carrier gas. Controlled amounts of hydrogen (H2/CH4=0–1 v/v) were introduced in separate experiments along with the carbon source. The properties and morphology of the synthesized single wall carbon nanotubes were monitored by transmission electron microscopy, Raman scattering, and thermogravimetric analysis. The nanotubes with the highest crystallinity were obtained with H2/CH4=0.6. By monitoring the Radial Breathing Modes present in the Raman spectra of the single-wall carbon nanotube samples, the variation of the structural and morphological properties of the carbon nanotubes with the flow level of hydrogen, reflect changes of the catalyst systems induced by the presence of hydrogen.