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The new allotropes of silicene and silicon nanotubes (SiNTs) are explored by density functional theory (DFT). They are made up of alternating four-membered ring and eight-membered ring. The results show that this new SiNTs are sp3 or sp2-sp3 hybridization based on the different types of structures. The possible existence of the planar silicene is also discussed. Besides, the average binding energies...
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