2D-materials

2- Production and Characterization of hybrid 2D materials: Dichalcogenides and graphene  

Recently, two-dimensional (2D) materials as graphene, hexagonal boron nitride (h-BN) and transition metal dichalcogenides have received enormous attention due to their fascinating properties and great potential for technological applications. An interesting possibility is the design of heterostructures from the stacking of different monolayers of 2D materials, with these new materials presenting distinct properties. In this project, we propose to growth monolayers of transition metal dichalcogenides, in particular, MoSe2 and HfSe2, on graphene and h-BN supported on Ni(111) surface. The aim is to obtain the parameters that allow the controlled growth (layer-by-layer) of high-quality ultrathin films, which will have their atomic and electronic structure characterized in situ by multiple experimental techniques. It will also be investigated the influence of the distinct substrates (graphene and h-BN) in the electronic/structural properties of the TMDs ultrathin films. The achievement of 2D materials heterostructures with a controlled number and orientation of the monolayers represents nowadays an important technological challenge that is essential for future applications of these materials in nano/optoelectronic devices.

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Publications of our results: 

1. Nataly Herrera-Reinoza*, Alisson Ceccatto dos Santos, Luis Henrique de Lima, Richard Landers, and Abner de Siervo*. “Atomically Precise Bottom-Up Synthesis of h-BNC: Graphene Doped with h-BN Nanoclusters”. Chemistry of Materials XX, XXXXX (2021). DOI: 10.1021/acs.chemmater.1c00081 . 
2. Lucas Barreto and Luis Henrique de Lima and Daniel Coutinho Martins and Caio Silva and Rodrigo Cezar de Campos Ferreira and Richard Landers and Abner de Siervo. “Selecting ‘convenient observers’ to probe the atomic structure of CVD graphene on Ir(111) via photoelectron diffraction”.  Journal of Physics: Condensed Matter 33 105001 (2021).  https://doi.org/10.1088/1361-648x/abceff
3. Gabriela Moura do Amaral, Isabela da Costa Tonon, Ricardo Javier Peña Román, Hannah de Oliveira Plath, Theo Massao Taniguchi, Luis Henrique de Lima, Luiz Fernando Zagonel, Richard Landers, Abner de Siervo. “Epitaxial growth, electronic hybridization and stability under oxidation of monolayer MoS2 on Ag(111)”. Applied Surface Science,Volume 538, (2021),148138.   https://doi.org/10.1016/j.apsusc.2020.148138
4. Rodrigo Cezar de Campos Ferreira, Luis Henrique de Lima, Lucas Barreto, Caio C. Silva, Richard Landers, and Abner de Siervo. “Unraveling the Atomic Structure of Fe Intercalated under Graphene on Ir(111): A Multitechnique Approach”.  Chemistry of Materials  30 (20), 7201-7210 (2018). DOI: 10.1021/acs.chemmater.8b03186
5. de Lima, L. H.; Barreto, L.; Landers, R.; de Siervo, A., Surface structure determination of black phosphorus using photoelectron diffraction. Physical Review B 2016, 93 (3).  DOI: 10.1103/PhysRevB.93.035448
6. de Lima, L. H.; Landers, R.; de Siervo, A., Patterning Quasi-Periodic Co 2D-Clusters underneath Graphene on SiC(0001). Chemistry of Materials 2014, 26 (14), 4172-4177.  DOI: 10.1021/cm501976b
7. de Lima, L. H.; Handschak, D.; Schoenbohm, F.; Landers, R.; Westphal, C.; de Siervo, A., Atomic structure of a bare buffer layer on SiC(0001) chemically resolved. Chemical Communications 2014.     DOI: 10.1039/c4cc05005c
8. de Lima, L. H.; de Siervo, A.; Landers, R.; Viana, G. A.; Goncalves, A. M. B.; Lacerda, R. G.; Haeberle, P., Atomic surface structure of graphene and its buffer layer on SiC(0001): A chemical-specific photoelectron diffraction approach. Physical Review B (2013), 87 , 081403R.   DOI: 10.1103/PhysRevB.87.081403