✦ LIBER ✦

99.9% purity multi-walled carbon nanotubes by vacuum high-temperature annealing

✍ Scribed by Wei Huang; Yao Wang; Guohua Luo; Fei Wei

Publisher: Elsevier Science
Year: 2003
Tongue: English
Weight: 496 KB
Volume: 41
Category: Article
ISSN: 0008-6223
DOI: 10.1016/s0008-6223(03)00330-0

No coin nor oath required. For personal study only.

✦ Synopsis

Ultrahigh purity multi-walled carbon nanotubes (MWNTs) were obtained, which were produced by a catalytic chemical 23 vapor deposition method and subsequently annealed at vacuum pressures between 10 and 10 Pa and temperatures between 1500 and 2150 8C. Acid treatments were made for comparison. Scanning electron microscopy, transmission electron microscopy and energy dispersive spectra were used to characterize the specimens. Purities were characterized by thermogravimetric analysis. Raman spectra were also reported. The high-temperature vacuum process efficiently removed residual metal catalysts and metal oxide carriers and enhanced the graphitization of the MWNTs. The highest MWNT purity achieved is about 99.9%. This procedure presents a nondestructive, commercially viable purification method for carbon nanotubes.

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