NEXAFS and X-ray scattering study of structure changes after post-annealing treatments of aligned MWNTs

作者：Bouchet Fabre B^*; Pinault M; Pichot V; Launois P; Mayne L'Hermite M; Parente P; Laffon K; Durand D; Reynaud C

来源：Diamond and Related Materials, 2005, 14(3-7): 881-886.

DOI：10.1016/j.diamond.2004.11.018

• carbon nanotube
• NEXAFS
• CVD
• X-ray diffraction

The control of the crystallization degree is an important issue for carbon nanotube applications. In this context, we present the evolution of the structure after post-annealing treatment of multiwalled carbon nanotubes (MWNT), obtained by the aerosol pyrolysis process, involving liquid aerosols containing both hydrocarbon source and the metal catalyst precursor.
The alignment and the degree of crystallinity of the raw and annealed carbon nanotubes have been quantified by X-ray diffraction measurements also used to analyze the metallic phases inside the nanotubes. The Near-Edge X-ray Absorption Fine Structure (NEXAFS) studies were performed at the C K-edge in order to follow the evolution of the electronic structure with the local structure and the degree of crystallinity of the nanotubes.
We confirm that this chemical vapour deposition synthesis method enables to produce well-aligned multiwalled carbon nanotubes. The effect of post-annealing temperature both on local ordering and graphitization degree of nanotube walls are described. The results are compared to the previous observations of individual nanotubes by HRTEM concerning the structural changes occurring during annealing treatments.

• 出版日期2005-7
• 单位中国地震局