A5053257277- 2D Materials and Applications
- Graphene research and applications
- MXene and MAX Phase Materials
- Carbon Nanotubes in Composites
- Perovskite Materials and Applications
- Chalcogenide Semiconductor Thin Films
- Organic and Molecular Conductors Research
- Photodynamic Therapy Research Studies
- Nanoplatforms for cancer theranostics
- Porphyrin and Phthalocyanine Chemistry
- Nonlinear Optical Materials Studies
- Microwave Dielectric Ceramics Synthesis
- Advanced Fiber Laser Technologies
- Organic Light-Emitting Diodes Research
- Mechanical and Optical Resonators
- Luminescence and Fluorescent Materials
- Advanced Photocatalysis Techniques
- Quantum and electron transport phenomena
- Laser-Ablation Synthesis of Nanoparticles
- Luminescence Properties of Advanced Materials
- Ferroelectric and Piezoelectric Materials
- Topological Materials and Phenomena
- Molecular Junctions and Nanostructures
- Force Microscopy Techniques and Applications
- Chemical and Physical Properties of Materials
Universidade Federal de Minas Gerais
2015-2024
Binghamton University
2022-2024
Pennsylvania State University
2020
Instituto de Investigaciones en Ciencias de la Salud
2016
Prefeitura Municipal de Belo Horizonte
2016
Doping lies at the heart of modern semiconductor technologies. Therefore, for two-dimensional (2D) semiconducting transition metal dichalcogenides (TMDs), significance controlled doping is no exception. Recent studies have indicated that, by substitutionally 2D TMDs with a judicious selection dopants, their electrical, optical, magnetic, and catalytic properties can be effectively tuned, endowing them great potential various practical applications. Herein, inspired sol-gel process, we report...
Abstract The development of bottom‐up synthesis routes for semiconducting transition metal dichalcogenides (TMDs) and the assessment their defects are paramount importance to achieve applications. TMD monolayers grown by chemical vapor deposition (CVD) can be subjected significant strain and, here, Raman photoluminescence spectroscopies combined characterize in over one hundred MoS 2 monolayer samples CVD. frequency changes phonons as a function analyzed, used extract Grüneisen parameter...
We demonstrate that hybrid systems of porphyrins and chirality enriched (6,5) single-walled carbon nanotubes (E-SWCNTs) are better candidates for photodynamic therapy (PDT) than their components alone. Surprisingly, the E-SWCNTs act as optical absorption enhancers to increasing oxygen singlet production when illuminated by a light source with energy higher E-SWCNT gap plus equivalent in an phonon. The phenomenon is explained based on transfer from porphyrin which finally transfers it...
Abstract Twisted bilayer graphene is a fascinating system due to the possibility of tuning electronic and optical properties by controlling twisting angle $$\theta$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>θ</mml:mi> </mml:math> between layers. The coupling Dirac cones two layers gives rise van Hove singularities (vHs) in density states, whose energies vary with . Raman spectroscopy fundamental tool study twisted (TBG) systems since response hugely enhanced when...
Abstract This work reports a detailed study of the double‐resonance (DR) Raman bands single‐layer MoS 2 as function temperature, using many different laser energies in region excitonic transitions and at temperatures between 80 300 K. Our measurements show that DR are strongly affected by temperature results explained terms dependence both phonon wavenumber energy. In order to distinguish these two effects, were directly measured photoluminescence temperature. It was observed from...
Nanohybrids of enriched (6,5) single-walled semiconducting carbon nanotubes (E-SWCNTs) and porphyrin can be used synergistically as photodynamic therapy (PDT) agents. The efficiency different porphyrins within the nanohybrids was investigated compared with results obtained from in previous studies. Reactive oxygen species singlet (1)O2 for first time hydroxyl radical ˙OH generation by under illumination were detected electron paramagnetic resonance using spin trapping molecules TEMP PBN....
Abstract Raman spectroscopy has been extensively used to probe disorder in graphene and other carbon-related materials, disorder-induced (DI) bands are prominent even for low defect densities. The DI MoS 2 have studied the last years, but a multiple excitation study using laser energies near excitonic was still lacking. In this work, we investigate low-frequency defect-induced coming from acoustic phonon branches Brillouin zone edge samples produced by mechanical exfoliation chemical vapor...
In this work, we present measurements of the temperature dependence resonance Raman spectra $\mathrm{Mo}{\mathrm{S}}_{2}$ in two-dimensional and bulk forms, performed to identify processes related different combinations two acoustic phonons involved intervalley scattering. The samples thicknesses (single layer, bilayer, trilayer, bulk) were measured near with $A$ excitonic transition at temperatures. Measurements using several laser energies across resonances $B$ transitions. Based on...
Photoluminescence and phosphorescence emissions of solid-state phenazine films were investigated in steady-state experimental conditions. Important discrepancies observed for blended where a host optically inert matrix was introduced to disperse the probe molecules. A vibronic spin-orbit phosphorescent emission clearly appeared, while solely composed by molecules, broadened presented structureless shape, shifted longer wavelengths. Further Arrhenius behavior analysis on photoluminescent...
Abstract In this work we report the structural and spectroscopic characterization of bulk MoS x Se 2-x solid solutions synthesized by chemical vapor transport. The crystals were analyzed scanning electron microscopy (SEM), x-ray diffraction (XRD), energy dispersive spectroscopy (EDS), atomic force (AFM), photoelectron (XPS) Raman spectroscopy. Electron evaluation layered materials shows two distinct types crystals: flat easily cleavable hexagonal microcrystals up to 50 μ m in size,...