Journal Club do Departamento de Física dos Materiais e Mecânica – FMT
Nesta semana a pós-graduanda Dimy Nanclares Fernandes Sanches, do Grupo Teórico de Materiais, apresentará o artigo: “Monolayer atomic crystal molecular superlattices”, Chen Wang et al.
Dia: 17 de outubro, quarta-feira, às 12h10.
Local: Sala de Seminários José Roberto Leite Edifício Alessandro Volta (bloco C).
Abstract:
Artificial superlattices, based on van der Waals heterostructures of two-dimensional atomic crystals such as graphene or molybdenum disulfide, offer technological opportunities beyond the reach of existing materials. In this paper, they report an electrochemical molecular intercalation approach to a new class of stable superlattices in which monolayer atomic crystals alternate with molecular layers. Using black phosphorus as a model system, they show that intercalation with cetyl-trimethylammonium bromide produces monolayer phosphorene molecular superlattices in which the interlayer distance is more than double that in black phosphorus, effectively isolating the phosphorene monolayers. They further show that several different twodimensional atomic crystals, such as molybdenum disulfide and tungsten diselenide, can be intercalated with quaternary ammonium molecules of varying sizes and symmetries to produce a broad class of superlattices with tailored molecular structures, interlayer distances, phase compositions, electronic and optical properties. These studies define a versatile material platform for fundamental studies and potential technological applications.
Nature, doi:10.1038/nature25774
