کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1794694 | 1023705 | 2007 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Synthesis and Raman scattering of β-SiC/SiO2 core-shell nanowires
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The β-SiC/SiO2 core-shell nanowires have been synthesized with the presence of iron catalyst by chemical vapor reaction using a mixture of milled Si and SiO2 powders and C3H6 as the raw materials in a graphite reaction cell at lower temperature. The as-prepared nanomaterials are characterized by scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction, high-resolution transmission electron microscopy, and infrared spectroscopy. The results show that the nanowires consist of a 30-50 nm diameter single-crystalline β-SiC core wrapped with a uniform layer of about 10 nm thick amorphous SiO2, and their lengths are up to several tens of micrometers. The nanowire axes lie along the [1¯ 1 1] direction and possess a high density of planar defects. Some unique properties are found in the Raman scattering from β-SiC/SiO2 core-shell nanowires, which are different from previous observations of SiC materials. The vapor-liquid-solid (VLS) mechanism was proposed to elucidate the growth process.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Crystal Growth - Volume 308, Issue 2, 15 October 2007, Pages 263-268
Journal: Journal of Crystal Growth - Volume 308, Issue 2, 15 October 2007, Pages 263-268
نویسندگان
Alan Meng, Zhenjiang Li, Jinli Zhang, Li Gao, Hejun Li,