کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1589129 | 1001972 | 2011 | 6 صفحه PDF | دانلود رایگان |

Shaping of carbon nanotubes (CNTs) into desired morphologies have attracted much attention recently. High quality heterostructured helical carbon nanotubes (HCNTs) were synthesized from transitional metal oxide and ethanol by chemical vapor deposition (CVD) in this paper. High resolution transmission electron microscopy (HRTEM) results showed that, heterostructured “U” shape, “G” shape and “S” shape HCNTs were achieved. Iron oxide was reduced to α-Fe by ethanol, and catalyzed the growth of heterostructured HCNTs. Helical coiling of HCNTs was induced by the anisotropic facet catalytic activity of α-Fe catalyst for carbon deposition. Then, symmetrical growth of two HCNTs from one catalyst nanoparticle resulted in symmetrical “U” shape HCNTs, while successive connecting of several “arc” and “tail” HCNTs led to asymmetrical “G” and “S” morphologies HCNTs.
Journal: Micron - Volume 42, Issue 6, August 2011, Pages 547–552