کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1589129 1001972 2011 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Synthesis of heterostructured helical carbon nanotubes by iron-catalyzed ethanol decomposition
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
Synthesis of heterostructured helical carbon nanotubes by iron-catalyzed ethanol decomposition
چکیده انگلیسی

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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Micron - Volume 42, Issue 6, August 2011, Pages 547–552
نویسندگان
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