Latest Research News

Mestrado em Ciências com ênfase em Física de Materiais: processo seletivo 2018

Setembro 15, 2017

O processo seletivo do Mestrado em Ciências com ênfase em Física de Materiais, do Departamento de Física (DEFIS) da UFOP, abre inscrições em duas linhas de pesquisa: 1) Materiais e sistemas estruturados e nanoestruturados e 2) Simulação computacional e modelagem matemática. 

 

As inscrições podem ser feitas entre 15 de setembro e 20 de novembro de 2017, em dias úteis, das 9h às 17h, na secretaria da Pós-Graduação em Ciências da UFOP, ou por sedex. Confira o edital Read more about Mestrado em Ciências com ênfase em Física de Materiais: processo seletivo 2018

Pesquisadores do Nano publicam na revista Nature Communications e são destaque na Science News

Julho 31, 2017

Em uma recente colaboração com pesquisadores de várias universidades do Brasil e o MIT dos EUA (UFMG, UFC, IFCE, UFPI e MIT), os professores Alan Barros de Oliveira e Matheus J. S. Matos, do departamento de Física da UFOP, publicaram um artigo na revista Nature Communications do importante grupo editorial Nature Publishing Group. 

O trabalho intitulado "Raman evidence for pressure-induced formation of diamondene" mostra a existência de um novo material, um diamante bidimensional com Read more about Pesquisadores do Nano publicam na revista Nature Communications e são destaque na Science News

  •  
  • 1 de 8
  • »
More

Recent Publications Nano

Synthesis, crystal structure, photophysical properties and theoretical studies of a novel bis(phenylisoxazolyl) benzene derivative

de Brito ACF, Correa RS, Pinto AA, Matos MJS, Tenorio JC, Taylor JG, Cazati T. Synthesis, crystal structure, photophysical properties and theoretical studies of a novel bis(phenylisoxazolyl) benzene derivative. Journal of Molecular Structure [Internet]. 2018 :-. 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).
Leia mais

Universal deformation pathways and flexural hardening of nanoscale 2D-material standing folds

Chacham H, Barboza APM, de Oliveira AB, de Oliveira CK, Batista RJC, Neves BRA. Universal deformation pathways and flexural hardening of nanoscale 2D-material standing folds. Nanotechnology [Internet]. 2018;29 (9) :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.
Leia mais

Robust nanofabrication of monolayer MoS2 islands with strong photoluminescence enhancement via local anodic oxidation.

Fernandes TFD, Gadelha A, Barboza A, Paniago R, Campos LC, Guimaraes P, Assis P, Almeida Neves BR. Robust nanofabrication of monolayer MoS2 islands with strong photoluminescence enhancement via local anodic oxidation. 2D Materials [Internet]. 2018. 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.
Leia mais

Raman evidence for pressure-induced formation of diamondene

Martins LGP, Matos MJS, Paschoal AR, Freire PTC, Andrade NF, Aguiar A??sio L, Kong J, Neves BRA, de Oliveira AB, Mazzoni M??rio SC, et al. Raman evidence for pressure-induced formation of diamondene. Nature Communications [Internet]. 2017;8 (1) :96. Publisher's VersionAbstract
Despite the advanced stage of diamond thin-film technology, with applications ranging from superconductivity to biosensing, the realization of a stable and atomically thick two-dimensional diamond material, named here as diamondene, is still forthcoming. Adding to the outstanding properties of its bulk and thin-film counterparts, diamondene is predicted to be a ferromagnetic semiconductor with spin polarized bands. Here, we provide spectroscopic evidence for the formation of diamondene by performing Raman spectroscopy of double-layer graphene under high pressure. The results are explained in terms of a breakdown in the Kohn anomaly associated with the finite size of the remaining graphene sites surrounded by the diamondene matrix. Ab initio calculations and molecular dynamics simulations are employed to clarify the mechanism of diamondene formation, which requires two or more layers of graphene subjected to high pressures in the presence of specific chemical groups such as hydroxyl groups or hydrogens.
Leia mais
More