Modifications in graphene electron states due to a deposited lattice of Au nanoparticles : density functional calculations.

• Autor(es): Carara, Sabrina Silva ; Batista, Ronaldo Junio Campos ; Chacham, Helio
• Data: 2015
• Origem: Oasisbr
• Tipo de Documento: Artigo científico
• Idioma: Inglês

Descrição

We perform first-principles investigations of two-dimensional, triangular lattices of Au38 nanoparticles deposited on a graphene layer. We find that lattices of thiolate-covered nanoparticles cause electronic structure modifications in graphene such as minigaps, charge transfer, and new Dirac points, but graphene remains metallic. In contrast, for a moderate coverage of nanoparticles __0.2 nm−2_, a lattice of bare _noncovered_ Au nanoparticles may induce periodic deformations on the graphene layer leading to the opening of a band gap of a few tens of meV at the Dirac point, in such a way that a properly charged system might become a semiconductor.