Citation:
ZHANG Ya-Fei, ZHANG Hong. The First Principles Study of Li, Al and Ca Doped Zigzag (7,0) Single Walled Carbon Nanotube[J]. Chinese Journal of Structural Chemistry,
;2016, 35(5): 731-739.
doi:
10.14102/j.cnki.0254-5861.2011-0918
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We use the ab initio density functional theory to calculate the band structure, den-sity of states, charge transfer, charge density difference, binding energy and vibration frequency. We can see that the conduction band through the Fermi level include SWNT/H2/Li, SWNT/H2/Al and SWNT/H2/Ca, which shows a kind of metallic character. The charge distribution and contour plots of charge difference density of ion/H2/SWNT show charge transfer between ion and H2 molecules rather than between H2 and H2. Meanwhile, the interaction between Al, Ca and H2 is weaker than that of Li. We can also prove that the ion is the primary reason to the increase of adsorption energy of hydrogen molecule in SWNT. Finally, we calculate the vibration frequency and don’t find any imaginary frequency, which proves that the (7,0) SWNT is more stable.
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