Details

Autor(en) / Beteiligte

• Pan, Yan
• Liu, Yunfang
• Chi, Weidong
• Shen, Zengmin

Titel

Inner-diameter enlargement of multi-walled carbon nanotubes by adding HBO₃ in catalyst

Ist Teil von

• Materials letters, 2011-12, Vol.65 (23-24), p.3362-3364

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2011

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Multi-walled carbon nanotubes (MWCNTs) with large inner diameter were synthesized by the catalytic chemical vapor deposition method using HBO₃ as the accessorial catalyst in reaction precursors. A ratio Dᵢₙ/Dₒᵤₜ is defined as an index to evaluate the hollow degree of MWCNTs, where Dᵢₙ and Dₒᵤₜ are the inner and outer diameter of one CNT, respectively. When no HBO₃ was added in the reaction mixtures, the MWCNTs are straight with thick wall. The average Dᵢₙ/Dₒᵤₜ value is only 0.08±0.02. The X-ray diffraction (XRD) result shows the relatively low crystallinity. When HBO₃ was added in the reaction precursors, the MWCNTs have large inner cavity and the average Dᵢₙ/Dₒᵤₜ value reaches 0.57±0.10. The crystallinity was also improved remarkably. These results indicate that HBO₃ in the catalyst system has great influence on the growth of MWCNTs.