کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1419742 986063 2017 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Large-scale synthesis and HRTEM analysis of single-walled B- and N-doped carbon nanotube bundles
ترجمه فارسی عنوان
سنتز در مقیاس بزرگ و تجزیه و تحلیل HRTEM از باندل های نانولوله کربنی آلاییده شده با N و B تک جداره
کلمات کلیدی
کربن های آلاییده شده با A ؛ نانولوله های کربنی؛ میکروسکوپ الکترونی C. عبوری (TEM)؛ طیف سنجی الکترونی از دست دادن انرژی (EELS)؛ D. ریزساختار
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی (عمومی)
چکیده انگلیسی

Bundles of B- and N-doped single-walled carbon nanotubes (SWNTs) containing up to ∼10 at% B and up to ∼2 at% N were synthesized at high yields under thermo–chemical treatment of pure C SWNT bundles and B2O3 in a flowing nitrogen atmosphere. The bundles were characterized by means of high-resolution transmission electron microscopy and electron energy loss spectroscopy. The effects of synthesis temperature (1503–1773 K) and time (30–240 min) on the B and N contents and yield of the SWNT bundles were determined. The maximum yield of the B- and N-doped SWNT bundles was obtained under synthesis at 1553 K over 30 min. Atomic structure and morphology of individual SWNTs in the bundles, in particular, packing of doped SWNTs, helicity distribution, encapsulation of fullerene-like clusters, diameter and shell number variations were studied. The synthesized SWNTs in the bundles were stacked in a honeycomb array with the uniform inter-tube spacing of ∼0.3 nm. No preferable orientation for the graphene-like tubular shells was found, i.e. both zigzag and armchair edges were observed with approximately equal proportions. Frequently, diameter increase took place for the outer tubes in a bundle and for isolated SWNTs. C-based or BN-based fullerene-like encapsulates were observed in individual SWNTs. Carbon oxidation by the B2O3 vapor and B and N substitution for C is thought to underlie the doping of C SWNTs. The substitution reaction temperature–time limits with respect to the morphological stability of B- and N-doped SWNT bundles are finally elucidated.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Carbon - Volume 38, Issue 14, 2000, Pages 2017–2027
نویسندگان
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