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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >XPS and Raman characterization of single-walled carbon nanotubes grown from pretreated Fe2O3 nanoparticles
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XPS and Raman characterization of single-walled carbon nanotubes grown from pretreated Fe2O3 nanoparticles

机译：由预处理的Fe2O3纳米颗粒生长的单壁碳纳米管的XPS和拉曼表征

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摘要

X-ray photoelectron (XPS) and Raman spectroscopic techniques have been used to study the influence of the annealing ambient (N2, Ar and H2) of nearly monodispersed Fe2O3 nanoparticles (mean size = 3.2 ± 1 nm) on the growth of carbon nanotubes by microwave plasma chemical vapour deposition. XPS characterization of the catalytic templates reveals that a N2 ambient reduces sintering of the Fe2O3 nanoparticles and confirms that the chemical phase involved in the nucleation of nanotubes is the metal state Fe0. Multi-excitation wavelength Raman spectroscopy (514, 574, 633 and 785 nm) reveals that the single-walled carbon nanotubes (SWCNTs) grown from N2-annealed catalyst nanoparticles range between 0.8 and 1.1 nm while SWCNTs grown from Ar-annealed catalyst nanoparticles exhibit a broader diameter distribution in the range 0.8–1.8 nm. The narrowness in the distribution of SWCNTs grown from the N2-annealed catalysts has been attributed to the enhanced stability of Fe2O3 nanoparticles in an N2 ambient.
机译：X射线光电子（XPS）和拉曼光谱技术已被用于研究几乎单分散的Fe2O3纳米颗粒（平均尺寸= 3.2±1 nm）的退火环境（N2，Ar和H2）对碳纳米管生长的影响。微波等离子体化学气相沉积。催化模板的XPS表征表明，N2环境降低了Fe2O3纳米颗粒的烧结，并确认了纳米管成核过程中涉及的化学相为金属态Fe0。多激发波长拉曼光谱（514、574、633和785 nm）显示，由N2退火的催化剂纳米颗粒生长的单壁碳纳米管（SWCNT）的范围为0.8至1.1 nm，而由Ar退火的催化剂纳米颗粒生长的SWCNT表现出直径分布范围在0.8-1.8 nm之间。从N2退火的催化剂中生长出的SWCNT的分布狭窄，是由于Fe2O3纳米颗粒在N2环境中的稳定性增强所致。

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