Efficient growth of multi-walled carbon nanotubes by continuous-wave laser vaporization of graphite containing B4C
✍ Scribed by Fumio Kokai; Iori Nozaki; Takashi Okada; Akira Koshio; Toru Kuzumaki
- Book ID
- 104009431
- Publisher
- Elsevier Science
- Year
- 2011
- Tongue
- English
- Weight
- 839 KB
- Volume
- 49
- Category
- Article
- ISSN
- 0008-6223
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✦ Synopsis
Multi-walled carbon nanotubes (MWCNTs), 7-70 nm thick and up to 30 lm long, were efficiently grown by room-temperature continuous-wave laser vaporization of a graphite target containing B 4 C in an ambient Ar gas. Adjusting the boron content in the target and Ar gas pressure resulted in a maximum fraction of $60% of MWCNTs in the deposits.
The straightness of the MWCNTs and graphene layers with an interlayer spacing of $0.35 nm indicated that the degree of graphitization was fairly high in the grown MWCNTs.
However, the features of D, G, and 2D bands in the Raman spectrum of a deposit suggested boron doping in the MWCNTs. An apparent Young's modulus of a grown MWCNT was measured to be 0.68 TPa and comparable to those of heat-treated vapor grown carbon nanofibers. MWCNTs are thought to grow on molten boron carbide particles acting as seeds at high temperatures of up to $2400 °C.