کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5423365 | 1507955 | 2010 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Entropy-driven adsorption of carbon nanotubes on (0Â 0Â 1) and (1Â 1Â 1) surfaces of CeO2 islands grown on sapphire substrate
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
According to the aim to compose combinatorial material by adsorption of carbon nanotubes onto the structured CeO2 surface the interaction of the armchair (5,5) and zigzag (8,0) nanotubes with the (0Â 0Â 1) and (1Â 1Â 1) surfaces of CeO2 islands have been investigated by theoretical methods. The thermodynamics of the adsorption were studied at the low surface coverage region. The interaction energy between the nanotube and the different CeO2 surfaces shows significant increase when the size of the interface reaches 7-8 unit cells of CeO2 and it remains unchanged in the larger interface region. However, the entropy term of the adsorption is significantly high when the distances of CeO2 islands are equal to 27Â nm (adsorption of armchair (5,5) nanotube) or 32Â nm (adsorption of zigzag (8,0) nanotube). This property supports adsorption of nanotubes onto CeO2 surfaces which possesses a very specific surface morphology. A long-wave vibration of nanotubes was identified as background of this unexpected phenomenon. This observation could be applicable in the development of such procedures where the nanotube adsorption parallel to the surface is aimed to perform.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface Science - Volume 604, Issues 7â8, 15 April 2010, Pages 654-659
Journal: Surface Science - Volume 604, Issues 7â8, 15 April 2010, Pages 654-659
نویسندگان
Sándor Kunsági-Máté, Jia Cai Nie,