Encontrados 11 documentos, a visualizar página 1 de 2
Electrochemical atomic layer epitaxy deposition of ultrathin SnTe films.
Manhabosco, Taíse Matte; Aloni, Shaul; Kuykendall, Tevye R.; Manhabosco, Sara Matte; Batista, Ana Bárbara; Soares, Jaqueline dos SantosTin telluride (SnTe) ultrathin films were deposited electrochemically on polycrystalline and monocrystalline gold substrates using the electrochemical atomic layer epitaxy (ECALE) method. The electrochemical behaviors of Sn and Te were studied systematically by means of cyclic voltammetry. Cyclic voltammetry curves for Sn displayed a broad peak in the region between -0.15 V and -0.35 V, which was related to the...
Development and characterization of titanium dioxide ceramic substrates with hi...
Freitas, Antonio Evangelista de; Manhabosco, Taíse Matte; Batista, Ronaldo Junio Campos; Rêgo Segundo, Alan Kardek; Araujo, Humberto Xavier deTitanium dioxide substrates have been synthesized by means of solid-state reactions with sintering temperatures varying from 1150 ◦C up to 1350 ◦C. X-ray diffraction and scanning electron microscopy (SEM) where employed to investigate the crystal structure, grain size and porosity of the resulting samples. The obtained ceramics are tetragonal (rutile phase) with average grain sizes varying from 2.94 µm up to 5....
Transport properties of hydrogenated cubic boron nitride nanofilms with gold el...
Moraes, Elizane Efigenia de; Coutinho Filho, Maurício Domingues; Batista, Ronaldo Junio CamposThe electrical transport properties of a fourlayered hydrogen-terminated cubic boron nitride sub-nanometer film in contact with gold electrodes are investigated via density functional calculations. The sample exhibits asymmetric metallic surfaces, a fundamental feature that triggers the system to behave like a typical p−n junction diode for voltage bias in the interval −0.2 ≤ V ≤ 0.2, where a rectification rati...
Crystal-oriented wrinkles with origami-type junctions in few-layer hexagonal bo...
Oliveira, Camilla Karla Brites Queiroz Martins de; Gomes, Egleidson Frederik do Amaral; Prado, Mariana C.; Alencar, Thonimar V.; Nascimento, Regiane doUnderstanding layer interplay is the key to utilizing layered heterostructures formed by the stacking of different two-dimensional materials for device applications. Boron nitride has been demonstrated to be an ideal substrate on which to build graphene devices with improved mobilities. Here we present studies on the morphology and optical response of annealed few-layer hexagonal boron nitride flakes deposited ...
A simple model for solute–solvent separation through nanopores based on core-so...
Vasconcelos, Cláudia Karina Barbosa de; Batista, Ronaldo Junio Campos; Régis, McGlennon da Rocha; Manhabosco, Taíse Matte; Oliveira, Alan Barros deWe propose an effective model for solute separation from fluids through reverse osmosis based on core-softened potentials. Such potentials have been used to investigate anomalous fluids in several situations under a great variety of approaches. Due to their simplicity, computational simulations become faster and mathematical treatments are possible. Our model aims to mimic water desalination through nano-membra...
Vibrational G peak splitting in laterally functionalized single wall carbon nan...
Oliveira, Alan Barros de; Chacham, Helio; Soares, Jaqueline dos Santos; Manhabosco, Taíse Matte; Resende, Hélio Fernando Verona deWe present a theoretical study of the vibrational spectrum, in the G band region, of laterally hydrogenated single wall carbon nanotubes through molecular dynamics simulations. We find that bilateral hydrogenation e which can be induced by hydrogenation under lateral strain e causes permanent oval deformations on the nanotubes and induces the splitting of vibrational states in the G-band region. We propose that...
Determination of current maps by svet of hot-dip galvanized steel under simulta...
Manhabosco, Sara Matte; Batista, Ronaldo Junio Campos; Silva, Sabrina Neves da; Dick, Luís Frederico PinheiroA new experimental procedure was used to analyse the corrosion behaviour of hot-dip Zn coated steel based on the association of the scanning vibrating electrode technique (SVET) and uniaxial tensile strain applied up to 3.1% in 0.01 M NaCl solutions without release of the elastic strain during the test. The nucleation of localized corrosion sites on the coating occurs at very low strain values around the yield ...
Corrosion, wear and wear–corrosion behavior of graphite-like a-C:H films deposi...
Manhabosco, Taíse Matte; Barboza, Ana Paula Moreira; Batista, Ronaldo Junio Campos; Neves, Bernardo Ruegger Almeida; Muller, Iduvirges LourdesThis work presents a comparative wear, corrosion and wear–corrosion (the last one in a simulated physiological solution) study of graphite-like a-C:H (GLCH) films deposited on bare and nitrided Ti6Al4V alloy. Films, deposited by r.f. PACVD, presented low porosity and promoted high corrosion resistance. The friction coefficient of the films was very lowwith appreciablewear resistance at roomconditions. However, ...
Corrosion and cell viability studies of graphite-like hydrogenated amorphous ca...
Santos, Adélia Moreira Marques dos; Batista, Ronaldo Junio Campos; Martins, Leo Anderson Meira; Ilha, Mariana; Vieira, Moema QueirozThis work presents a study of corrosion resistance and cell viability of carbon films on bare and nitride Ti–6Al–4V. Films deposited on bare alloy significantly improve the corrosion resistance. Unexpectedly, films deposited on nitrided alloy present delamination and cracking after 16 days. We associate film failure with the presence of pores combined with a weak film/substrate interaction that allows diffusion...
Stoichiometric boron nitride fullerenes with homopolar B–B and N–N bonds.
Batista, Ronaldo Junio CamposA new class of boron nitride fullerenes, which are stoichiometric and presents homopolar bonds, is proposed in this work. A combined first-principles/elastic-model approach predicts that stoichiometric fullerenes with more than 1000 atoms which present homopolar bonds are energetically more stable than those without homopolar bonds. The HOMO–LUMO gap of stoichiometric fullerenes with homopolar bonds is 1.7 eV s...