K. A. S. Araujo, L. A. Cury, Matheus J. S. Matos, Luiz G. Cancado, T. F. D. Fernandes, and B. R. A. Neves. 3/23/2018. “Electro-optical interfacial effects on a graphene/π-conjugated organic semiconductor hybrid system.” Beilstein J. Nanotechnol. , 9, Pp. 963–974. Publisher's VersionAbstract

The influence of graphene and retinoic acid (RA) – a π-conjugated organic semiconductor – interface on their hybrid system is investigated. The physical properties of the interface are assessed via scanning probe microscopy, optical spectroscopy (photoluminescence and Raman) and ab initio calculations. The graphene/RA interaction induces the formation of a well-organized π-conjugated self-assembled monolayer (SAM) at the interface. Such structural organization leads to the high optical emission efficiency of the RA SAM, even at room temperature. Additionally, photo-assisted electrical force microscopy, photo-assisted scanning Kelvin probe microscopy and Raman spectroscopy indicate a RA-induced graphene doping and photo-charge generation. Finally, the optical excitation of the RA monolayer generates surface potential changes on the hybrid system. In summary, interface-induced organized structures atop 2D materials may have an important impact on both design and operation of π-conjugated nanomaterial-based hybrid systems.

Ana P. M. Barboza, Matheus J. S. Matos, Helio Chacham, Ronaldo J. C. Batista, Alan B. de Oliveira, Mario S. C. Mazzoni, and Bernardo R. A. Neves. 2018. “Compression-Induced Modification of Boron Nitride Layers: A Conductive Two-Dimensional BN Compound.” ACS Nano, Pp. null. Publisher's Version
M. Cariglia, A. Galajinsky, G. W. Gibbons, and P. A. Horvathy. 2018. “Cosmological aspects of the Eisenhart–Duval lift.” The European Physical Journal C, 78, 4, Pp. 314. Publisher's VersionAbstract
A cosmological extension of the Eisenhart–Duval metric is constructed by incorporating a cosmic scale factor and the energy-momentum tensor into the scheme. The dynamics of the spacetime is governed by the Ermakov–Milne–Pinney equation. Killing isometries include spatial translations and rotations, Newton–Hooke boosts and translation in the null direction. Geodesic motion in Ermakov–Milne–Pinney cosmoi is analyzed. The derivation of the Ermakov–Lewis invariant, the Friedmann equations and the Dmitriev–Zel'dovich equations within the Eisenhart–Duval framework is presented.
Marco Cariglia, Roberto Giambò, and Andrea Perali. 2018. “Electronic Properties of Curved Few-Layers Graphene: A Geometrical Approach.” Condensed Matter, 3, 2}, ARTICLE NUMBER = 1. Publisher's VersionAbstract
We show the presence of non-relativistic Lévy-Leblond fermions in flat three- and four-layers graphene with AB stacking, extending the results obtained in Cariglia et al. 2017 for bilayer graphene. When the layer is curved we obtain a set of equations for Galilean fermions that are a variation of those of Lévy-Leblond with a well defined combination of pseudospin, and that admit Lévy-Leblond spinors as solutions in an approriate limit. The local energy of such Galilean fermions is sensitive to the intrinsic curvature of the surface. We discuss the relationship between two-dimensional pseudospin, labelling layer degrees of freedom, and the different energy bands. For Lévy-Leblond fermions, an interpretation is given in terms of massless fermions in an effective 4D spacetime, and in this case the pseudospin is related to four dimensional chirality. A non-zero energy band gap between conduction and valence electronic bands is obtained for surfaces with positive curvature.
Janine Braga de Souza, Jacqueline de Souza, Lara Maria Lopes de Castro, Melissa Fabíola Siqueira, Ranylson Marcello Leal Savedra, and Neila Márcia Silva-Barcellos. 2018. ““Evaluation of the losartan solubility in the biowaiver context by shake-flask method and intrinsic dissolution”.” Pharmaceutical Development and Technology, ja, Pp. 1-32. Publisher's Version
Rafael F. Dias, Jonathan da Rocha Martins, Hélio Chacham, Alan B. de Oliveira, Taíse M. Manhabosco, and Ronaldo J. C. Batista. 2018. “Nanoporous Graphene and H-BN from BCN Precursors: First-Principles Calculations.” The Journal of Physical Chemistry C, 122, 7, Pp. 3856-3864. Publisher's Version
Marlucy da C. Gonçalves, Jason Taylor, Joamyr Rossoni Júnior, Ana Carolina S. Rabelo, Daniela Costa, Thiago Cazati, and Viviane M. R. dos Santos. 2018. “Preliminary Studies of the Cytotoxicity and Photoprotective Properties of Benzophenone and Lactone Derivatives.” Revista Virtual de Química, 10, Pp. 600-608.
Thales Fernando Damasceno Fernandes, Andreij Gadelha, Ana Barboza, Roberto Paniago, Leonardo Cristiano Campos, Paulo Guimaraes, Pierre Assis, and Bernardo Ruegger Almeida Neves. 2018. “Robust nanofabrication of monolayer MoS2 islands with strong photoluminescence enhancement via local anodic oxidation..” 2D Materials. Publisher's VersionAbstract
Abstract In this work, we demonstrate the nanofabrication of monolayer MoS2 islands using local anodic oxidation of few-layer and bulk MoS2 flakes. The nanofabricated islands present true monolayer Raman signal and photoluminescence intensity up to two orders of magnitude larger than that of a pristine monolayer. This technique is robust enough to result in monolayer islands without the need of meticulously fine-tuning the oxidation process, thus providing a fast and reliable way of creating monolayer regions with enhanced optical properties and with controllable size, shape, and position.
A.C.F. de Brito, R.S. Correa, A.A. Pinto, M. J. S. Matos, J.C. Tenorio, J.G. Taylor, and T. Cazati. 2018. “Synthesis, crystal structure, photophysical properties and theoretical studies of a novel bis(phenylisoxazolyl) benzene derivative.” Journal of Molecular Structure, Pp. -. Publisher's VersionAbstract
Abstract Isoxazoles have well established biological activities but, have been underexplored as synthetic intermediates for applications in materials science. The aims of this work are to synthesis a novel isoxazole and analyze its structural and photophysical properties for application in electronic organic materials. The novel bis (phenylisoxazolyl) benzene compound was synthesized in four steps and characterized by NMR, high resolution mass spectrometry, differential thermal analysis, infrared spectroscopy, cyclic voltammetry, ultraviolet–visible spectroscopy, fluorescence spectroscopy, \DFT\ and \TDDFT\ calculations. The molecule presented optical absorption in the ultraviolet region (from 290 nm to 330 nm), with maximum absorption length centered at 306 nm. The molar extinction coefficients (ε), fluorescence emission spectra and quantum efficiencies in chloroform and dimethylformamide solution were determined. Cyclic voltammetry analysis was carried out for estimating the \HOMO\ energy level and these properties make it desirable material for photovoltaic device applications. Finally, the excited-state properties of present compound were calculated by time-dependent density functional theory (TDDFT).
Thiago Sousa, Thales Fernando Damasceno Fernandes, Matheus J. S. Matos, Eduardo Nery Duarte Araujo, Mario S. C. Mazzoni, Bernardo R. A. Neves, and Flávio Plentz. 2018. “Thionine Self-Assembled Structures on Graphene: Formation, Organization, and Doping.” Langmuir, ja, Pp. null. Publisher's Version
Helio Chacham, Ana Paula M Barboza, Alan B de Oliveira, Camilla K de Oliveira, Ronaldo JC Batista, and Bernardo RA Neves. 2018. “Universal deformation pathways and flexural hardening of nanoscale 2D-material standing folds.” Nanotechnology, 29, 9, Pp. 095704. Publisher's VersionAbstract
In the present work, we use atomic force microscopy nanomanipulation of 2D-material standing folds to investigate their mechanical deformation. Using graphene, h-BN and talc nanoscale wrinkles as testbeds, universal force–strain pathways are clearly uncovered and well-accounted for by an analytical model. Such universality further enables the investigation of each fold bending stiffness κ as a function of its characteristic height h 0 . We observe a more than tenfold increase of κ as h 0 increases in the 10–100 nm range, with power-law behaviors of κ versus h 0 with exponents larger than unity for the three materials. This implies anomalous scaling of the mechanical responses of nano-objects made from these materials.
Gustavo A. Ferrari, Alan B. de Oliveira, Ive Silvestre, Matheus J. S. Matos, Ronaldo J. C. Batista, Thales F. D. Fernandes, Leonel M. Meireles, Gomes S. N. Eliel, Helio Chacham, Bernardo R. A. Neves, and Rodrigo G. Lacerda. 2018. “Apparent Softening of Wet Graphene Membranes on a Microfluidic Platform.” ACS Nano, Pp. null. Publisher's Version