Unexpected Structures for Intercalation of Sodium in Epitaxial Graphene-SiC Interfaces

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In this paper, the authors show using scanning tunneling microscopy, spectroscopy, and ab initio calculations that several intercalation structures exist for Na in epitaxial graphene on SiC(0001). Intercalation takes place at room temperature and Na electron-dopes the graphene. It intercalates in-between single-layer graphene and the carbon-rich interfacial layer. It also penetrates beneath the interfacial layer and decouples it to form a second graphene layer. This decoupling is accelerated by annealing and is verified by direct Na deposition onto the interface layer. The authors' observations show that intercalation in graphene is fundamentally different than in graphite and is a versatile means ... continued below

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16 p.

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Sandin, Andreas; Jayasekera, Thushari; Rowe, J. E.; Kim, Ki Wook; Buongiorno Nardelli, Marco & Dougherty, Daniel B. February 2012.

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In this paper, the authors show using scanning tunneling microscopy, spectroscopy, and ab initio calculations that several intercalation structures exist for Na in epitaxial graphene on SiC(0001). Intercalation takes place at room temperature and Na electron-dopes the graphene. It intercalates in-between single-layer graphene and the carbon-rich interfacial layer. It also penetrates beneath the interfacial layer and decouples it to form a second graphene layer. This decoupling is accelerated by annealing and is verified by direct Na deposition onto the interface layer. The authors' observations show that intercalation in graphene is fundamentally different than in graphite and is a versatile means of electronic control.

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16 p.

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Copyright 2012 American Physical Society. APS March Meeting 2012, February 27-March 2, 2012, abstract #W12.004.

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  • American Physical Society (APS) March Meeting, 2012, Boston, Massachusetts, United States

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  • February 2012

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  • Feb. 1, 2013, 9:58 a.m.

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  • June 19, 2013, 1:12 p.m.

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Sandin, Andreas; Jayasekera, Thushari; Rowe, J. E.; Kim, Ki Wook; Buongiorno Nardelli, Marco & Dougherty, Daniel B. Unexpected Structures for Intercalation of Sodium in Epitaxial Graphene-SiC Interfaces, paper, February 2012; (digital.library.unt.edu/ark:/67531/metadc139464/: accessed October 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT College of Arts and Sciences.