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http://hdl.handle.net/1843/51537| Tipo: | Artigo de Periódico |
| Título: | Self-assembled triangular graphene nanostructures: evidence of dual electronic response |
| Autor(es): | Thaís Chagas Peixoto Silva Ângelo Malachias de Souza Marta Pelc Pedro Henrique Rezende Gonçalves Igor de Souza Lana Antoniazzi Jhon Wilfer González Salazar Andrés Ayuela Fernández João Marcelo Jordão Lopes Myriano Henriques de Oliveira Junior Rogério Magalhães Paniago |
| Resumo: | Structural and electronic properties of bilayer graphene films and nanostructures obtained through the graphitization of SiC(0001) were investigated in this work using scanning tunneling microscopy and spectroscopy. We report on the observation of triangular nanostructures which result from extended stacking faults in the SiC substrate and their effects on graphene layers that are formed on top of them. Spectroscopic measurements revealed distinct electronic responses as a function of the local hydrogen intercalation. Spectroscopic signatures ranging from single- to double-layer graphene, as well as intermediate states were observed as a consequence of the (in)complete hydrogen intercalation process. High resolution topographic scanning tunneling microscopy images at resonant bias voltages inside triangular nanostructures reveal that the bottom layer of the bilayer graphene film is still bonded to the substrate. Therefore, the triangular nanostructures present edges and facets with the coexistence of carbon atoms in sp3 and sp2 hybridizations. Using atomistic calculations we have modeled the local density of states of these objects reproducing their electronic response. The generation of regions with distinct electronic responses is potentially interesting for high-density data storage with hidden bit capabilities. |
| Assunto: | Grafeno Microscopia de tunelamento de varredura Análise espectral |
| Idioma: | eng |
| País: | Brasil |
| Editor: | Universidade Federal de Minas Gerais |
| Sigla da Instituição: | UFMG |
| Departamento: | ICX - DEPARTAMENTO DE FÍSICA |
| Tipo de Acesso: | Acesso Restrito |
| Identificador DOI: | https://doi.org/10.1016/j.carbon.2018.10.059 |
| URI: | http://hdl.handle.net/1843/51537 |
| Data do documento: | 2018 |
| metadata.dc.url.externa: | https://www.sciencedirect.com/science/article/pii/S0008622318309746 |
| metadata.dc.relation.ispartof: | Carbon |
| Aparece nas coleções: | Artigo de Periódico |
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