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Silicene is a two-dimensional allotrope of silicon, with a hexagonal honeycomb structure similar to that of graphene. == History == Although theorists had speculated about the existence and possible properties of silicene, researchers first observed silicon structures that were suggestive of silicene in 2010. Using a scanning tunneling microscope they studied self-assembled silicene nanoribbons and silicene sheets deposited onto a silver crystal, Ag(110) and Ag(111), with atomic resolution. The images revealed hexagons in a honeycomb structure similar to that of graphene. Density functional theory (DFT) calculations showed that silicon atoms tend to form such honeycomb structures on silver, and adopt a slight curvature that makes the graphene-like configuration more likely. However, such a model has been invalidated for Si/Ag(110): the Ag surface displays a missing-row reconstruction upon Si adsorption and the honeycomb structures observed are tip artefacts. In 2015, a silicene field-effect transistor made its debut that opens up new opportunities for two-dimensional silicon for various fundamental science studies and electronic applications,〔Peplow, Mark (2 February 2015) ("Graphene’s cousin silicene makes transistor debut" ). ''Nature News & Comment''.〕〔Iyengar, Rishi (February 5, 2015). ("Researchers Have Made Computer-Chip Transistors Just One Atom Thick" ). ''TIME.com''.〕〔Davenport, Matt (February 5, 2015). ("Two-Dimensional Silicon Makes Its Device Debut" ). ''acs.org''. 〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Silicene」の詳細全文を読む スポンサード リンク
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