A5056093125- Quantum Dots Synthesis And Properties
- Advanced Photocatalysis Techniques
- Copper-based nanomaterials and applications
- Iron oxide chemistry and applications
- Semiconductor Quantum Structures and Devices
- Semiconductor materials and devices
- Molecular Junctions and Nanostructures
- Chalcogenide Semiconductor Thin Films
- Nanocluster Synthesis and Applications
- Perovskite Materials and Applications
- Graphene research and applications
- Surface and Thin Film Phenomena
- Carbon and Quantum Dots Applications
- Semiconductor materials and interfaces
- Electrocatalysts for Energy Conversion
- Anodic Oxide Films and Nanostructures
- Nanowire Synthesis and Applications
- Catalytic Processes in Materials Science
- Graphene and Nanomaterials Applications
- Electronic and Structural Properties of Oxides
- ZnO doping and properties
- Diamond and Carbon-based Materials Research
- Magnetic Properties and Synthesis of Ferrites
- Luminescence Properties of Advanced Materials
- nanoparticles nucleation surface interactions
Laboratório Nacional de Nanotecnologia
2016-2025
Laboratório Nacional de Ciência e Tecnologia do Bioetanol
2013-2025
Brazilian Center for Research in Energy and Materials
2015-2024
Brazilian Biosciences National Laboratory
2015-2024
Universidade Estadual de Campinas (UNICAMP)
1998-2022
Pontifícia Universidade Católica de Campinas
2014-2021
Federal University of São João del-Rei
2021
National Nanotechnology Center
2018
Brazilian Synchrotron Light Laboratory
2003-2014
Universidade Federal de São Carlos
2006-2007
The exploitation of the spin in charge-based systems is opening revolutionary opportunities for device architecture. Surprisingly, room temperature electrical transport through magnetic nanowires still an unresolved issue. Here, we show that ferromagnetic (Co) suspended atom chains spontaneously display electron half a conductance quantum, as expected fully polarized conduction channel. Similar behavior has been observed Pd (a quasimagnetic 4d metal) and Pt nonmagnetic 5d metal). These...
The selective action of drugs in tumor cells is a major problem cancer therapy. Most chemotherapy act nonspecifically and damage both healthy causing various side effects. In this study, the preparation drug delivery system, which able to as carrier for hydrophobic anticancer reported. Amino-functionalized silica nanoparticles loaded with curcumin were successfully synthesized via sol–gel approach duly characterized. Thereafter, targeting ligand, folate, was covalently attached amino groups...
Lead halide perovskites have emerged as promising materials for light-emitting devices. Here, we report the preparation of colloidal CsPbBr3 nanoplatelets (3 × 4 23 nm3) experiencing a strong quasi-one-dimensional quantum confinement. Ultrafast transient absorption and broadband fluorescence up-conversion spectroscopies were employed to scrutinize carrier quasiparticle dynamics obtain full description spectroscopic properties material. An exciton binding energy 350 meV, an cross section at...
We have analyzed the atomic arrangements and quantum conductance of silver nanowires generated by mechanical elongation. The surface properties Ag induce unexpected structural properties, such as, for example, predominance high aspect-ratio rodlike wires. behavior was used to understand data proposed correlation confirmed means theoretical calculations. These results emphasize that metal point contacts is determined preferred structures, atomistic descriptions are essential interpret...
The phosphate-dependent transition between enzymatically inert dimers into catalytically capable tetramers has long been the accepted mechanism for glutaminase activation. Here, we demonstrate that activated C (GAC) self-assembles a helical, fiber-like double-stranded oligomer and propose molecular model consisting of seven tetramer copies per turn strand interacting via N-terminal domains. loop 321LRFNKL326 is projected as major regulating element self-assembly enzyme Furthermore,...
Abstract Functional heterofibrous hybrid materials are prepared in an integrative approach from aqueous dispersions of nanofibrillated cellulose and sepiolite by applying high shear homogenization ultrasound irradiation. Both types nanofibers remain physically cross‐linked forming homogeneous very stable high‐viscosity gels that can be shaped as films considered “hybrid nanopapers” well. The presence modifies the surface roughness resulting casting process, which rendered hydrophobic,...
We present a study of the structural and quantum conductance properties atomic-size copper nanowires generated by mechanical stretching. The atomistic evolution was derived from time-resolved electron microscopy observations molecular dynamics simulations. have analyzed transport behavior means measurements theoretical calculations. results suggest formation an unusual highly stable pentagonal Cu nanowire with diameter approximately 0.45 nm 4.5 quanta.
The formation of carbon nanotubes in a pure arc helium atmosphere is found to involve liquid carbon. Electron microscopy shows viscous liquid-like amorphous layer covering the surfaces nanotube-containing millimeter-sized columnar structures from which cathode deposit composed. Regularly spaced, submicrometer-sized spherical beads are often on at these columns. Apparently, anode, liquid-carbon drops form, acquire carbon-glass surface due rapid evaporative cooling. Nanotubes crystallize...
In this work, we report the synthesis of titanium oxide nanocrystals, especially rutile TiO2 phase with nanorod morphology, by a method based on peroxotitanium complex decomposition. The results indicate that anisotropic morphology reported for nanocrystals is related to oriented attachment process. Despite predominance at longer treatment times, were obtained also in anatase type, according degradation time adopted. XANES evidenced absence structural correlation between peroxytitanium and...
Elucidating cardiac evolution has been frustrated by lack of fossils. One celebrated enigma in involves the transition from a outflow tract dominated multi-valved conus arteriosus basal actinopterygians, to an commanded non-valved, elastic, bulbus higher actinopterygians. We demonstrate that preservation is possible extinct fish Rhacolepis buccalis Brazilian Cretaceous. Using X-ray synchrotron microtomography, we show fossils display hearts with containing at least five valve rows. This...
The study of the interaction electron irradiation with matter and response material to passage electrons is a very challenging problem. However, growth mechanism observed during nanostructural evolution appears be broad promising scientific field in nanotechnology. We report situ TEM electron-driven silver (Ag) nanocrystals through an additive-free synthetic procedure. Observations revealed direct effect beam on morphological Ag different mechanisms, such as mass transport, site-selective...
Abstract CdTe/CdS core/shell quantum dots (QDs) are formed in aqueous synthesis via the partial decomposition of hydrophilic thiols, used as surface ligands. In this work, we investigate influence chemical nature (functional group and chain length) ligands on shell formation. Four different compared: 3-mercaptopropionic acid, MPA, thioglycolic TGA, sodium 3-mercaptopropanesulfonate, MPS, 2-mercaptoethanesulfonate, MES. The QD growth rate increases when ligand aliphatic length decreases due...
Proteins spontaneously adsorb on nanoparticle surfaces when injected into the bloodstream. It drastically modifies nanoparticle's fate and how they interact with organs cells. Although this protein layer (protein corona) has been widely studied, robustness of most employed characterization methods visualization its unstained fractions remain open questions. Here, synchrotron-based small-angle X-ray scattering was used to follow corona formation estimate binding parameters. At same time,...
Titanium dioxide nanoparticles are of particular interest in photocatalysis and artificial photosynthesis studies. Their properties dependent on parameters such as the crystal polymorph, for example, anatase/rutile phases, specific surface area, capacity to adsorb CO2 H2O gas molecules. A cause-effect relationship exists between those parameters, thermochemistry, performance application. However, lack systematic thermodynamic data has hindered a more comprehensive understanding enable...
A dual-modification strategy enables the design of hematite with synergistic Al 3+ bulk doping and Zr 4+ interfacial segregation for improved performance as a photoanode.
This article reports on the growth of SnO nanobelts and dendrites by a carbothermal reduction process. The materials were synthesized in sealed tube furnace at 1210 °C 1260 for 2 h, dynamic nitrogen atmosphere 40 sccm. After synthesis, gray-black collected downstream samples characterized scanning electron microscopy (SEM), transmission (TEM), energy-dispersive X-ray spectroscopy (EDX). results showed that composed nanobelts, which grew [110] direction orthorhombic structure SnO. Some belts...
”<italic>Together we are stronger</italic>”: For the first time, TiO<sub>2</sub>/CdS/rGO/Pt nanocomposite was used as a catalyst for photocatalytic reduction of CO<sub>2</sub> to CH<sub>4</sub>.