کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5359967 | 1503643 | 2014 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Diameter control of single wall carbon nanotubes synthesized using chemical vapor deposition
ترجمه فارسی عنوان
کنترل قطر نانولوله های کربنی تک دیواره با استفاده از رسوب بخار شیمیایی
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
چکیده انگلیسی
Lack of control on the chirality or diameter of single-wall carbon nanotubes (SWCNTs) during synthesis is a major impediment in the path of their widespread commercialization. We demonstrate that the humble technique of catalytic chemical vapor deposition of methane, without any sophisticated catalyst preparation, can provide significant control on the diameter of the synthesized SWCNTs. The catalyst used is a solid solution of the bimetals Fe-Mo or Co-Mo in MgO. The radial breathing modes (RBMs) in the Raman spectra of SWCNTs were used to find out the diameters. Kataura plot along with RBMs was used to study the chirality of the tubes. High concentration of the catalysts (Co:Mo:MgOÂ =Â 1:0.5:15 and Fe:Mo:MgOÂ =Â 1:0.5:30) resulted in high yields. However, most of these carbonaceous materials were impurities. Reducing the concentration not only improved the purity and crystallinity (ID/IG ratio â¼0.1), but most importantly reduced the diameter spread of the SWCNTs. Majority of the SWCNTs grown using the low concentration catalysts (Co:Mo:MgOÂ =Â 1:0.5:300 and Fe:Mo:MgOÂ =Â 1:0.5:200) were estimated to have diameters lying between 1.13 and 1.65Â nm. This narrowing of diameter spread happened for both Fe and Co catalyst systems and depended only on the concentration of the catalyst.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Surface Science - Volume 321, 1 December 2014, Pages 70-79
Journal: Applied Surface Science - Volume 321, 1 December 2014, Pages 70-79
نویسندگان
Soumyendu Roy, Reeti Bajpai, Navneet Soin, Susanta Sinha Roy, James A. McLaughlin, D.S. Misra,