A5087494274- Semiconductor Quantum Structures and Devices
- Quantum Dots Synthesis And Properties
- Iron oxide chemistry and applications
- ZnO doping and properties
- Magnetic Properties and Synthesis of Ferrites
- Advanced Semiconductor Detectors and Materials
- Chalcogenide Semiconductor Thin Films
- Gas Sensing Nanomaterials and Sensors
- Characterization and Applications of Magnetic Nanoparticles
- Nanoparticle-Based Drug Delivery
- Multiferroics and related materials
- Quantum and electron transport phenomena
- Copper-based nanomaterials and applications
- Transition Metal Oxide Nanomaterials
- Perovskite Materials and Applications
- Spectroscopy Techniques in Biomedical and Chemical Research
- Gold and Silver Nanoparticles Synthesis and Applications
- Semiconductor Lasers and Optical Devices
- Semiconductor materials and devices
- Nanowire Synthesis and Applications
- Forensic Fingerprint Detection Methods
- Catalytic Processes in Materials Science
- Nanoparticles: synthesis and applications
- Minerals Flotation and Separation Techniques
- Magneto-Optical Properties and Applications
Universidade de Brasília
2016-2025
Universidade Federal de São Carlos
1995-2023
Universidade de São Paulo
1996-2023
Universidade Paulista
2023
Universidade Católica de Brasília
2023
Universidad Nacional de San Agustin de Arequipa
2023
Instituto de Física La Plata
2016-2020
Nucleus (Norway)
2019
Anhui University
2017
Universidade Federal de Goiás
2007
Photodynamic therapy (PDT) combines light, molecular oxygen and a photosensitizer to induce oxidative stress in target cells. Certain hydrophobic photosensitizers, such as aluminium-phthalocyanine chloride (AlPc), have significant potential for antitumor PDT applications. However, molecules often require drug-delivery systems, nanostructures, improve their pharmacokinetic properties prevent aggregation, which has quenching effect on the photoemission aqueous media. As result, this work aims...
Abstract Ni‐doped SnO 2 nanoparticles, promising for gas‐sensing applications, have been synthesized by a polymer precursor method. X‐ray diffraction (XRD) and transmission electron microscopy (TEM) data analyses indicate the exclusive formation of nanosized particles with rutile‐type phase (tetragonal ) Ni contents below 10 mol%. The mean crystallite size shows progressive reduction content. Room‐temperature Raman spectra nanoparticles show presence active modes activated effects. From...
In this study, we report on how surface-passivated and nonpassivated cobalt ferrite nanoparticles (8 nm diameter), suspended as ionic magnetic fluids aged under low pH conditions, revealed different behavior far the time evolution of iron/cobalt cation distribution, crystal quality, coercivity, saturation magnetization are concerned. Different techniques were used to perform a detailed study regarding chemical stability, structural surface properties function aging time. Properties...
Co x Fe 3 − O 4 -based (x=0.05–1.6) nanoparticles prepared by combustion reaction were investigated using x-ray diffraction, Raman spectroscopy, and Mössbauer spectroscopy. The data revealed Co2+ in both tetrahedral (site A) octahedral B) sites of the cubic ferrite structure. For x⩽0.4 experimental indicated synthesis a core-shell structure, with hematite as shell cobalt core nanoparticle. Differences crystalline structure between two phases support evidences we found highly stressed...
In this study, we report on the structural and hyperfine properties of Al-doped SnO2 nanoparticles synthesized by a polymer precursor method. The x-ray diffraction data analysis carried out using Rietveld refinement method shows formation only rutile-type structures in all samples, with decreasing mean crystallite size as Al content. A systematic study unit cell, well vicinity interstitial position show strong evidence two doping regimes structure SnO2. Below 7.5 mol% dominant substitutional...
In this study, we report on the synthesis of CdSe/CdS core-shell ultrasmall quantum dots (CS-USQDs) using an aqueous-based wet chemistry protocol. The proposed chemical route uses increasing concentration 1-thioglycerol to grow CdS shell top as-precipitated CdSe core in a controllable way. We found that lower (3 mmol) added into reaction medium limits growth core, and higher (5-11 promotes very way, with increase from 0.50 1.25 nm thickness. CS-USQDs was confirmed by different experimental...
In this study we present modifications in a phonon confinement model order to obtain better description for the Raman spectra of spherical nanocrystals, namely: bare-core, core–shell, and core–multishell. Our new interpretations allow investigating influences interfacial alloying strain effects on vibrational core–shell nanocrystals. The robustness modified was confirmed by precisely describing wurtzite CdSe/CdS magic-sized quantum dots (CS-MSQDs) synthesized directly aqueous solution route....
Hexagonal and cubic GaN layers are grown on (001) GaAs substrates by means of molecular beam epitaxy. First order Raman spectra taken from these at various incident laser wavelengths temperatures. The T2 transverse-optical (TO) longitudinal-optical (LO) frequencies determined, as well the A1 TO LO, E1 TO, E2 hexagonal GaN. frequency lies between one expects comparing lattice dynamics zincblende wurtzite type crystals. is close to calculated value but disagrees with a recently reported...
Abstract Superparamagnetic iron oxide nanoparticles (SPION) are of great interest for application in magnetic fluid hyperthermia (MFH) due to their heat generation capability an external alternating field, besides biocompatibility, and surface properties. MFH has emerged as a promisor therapeutic approach cancer treatment is based controlled heating tumor tissue through the accumulation SPIONs within cells. This work describes new route preparation folate-conjugated PEGylated SPIONs, which...
When Fe-ions enter into the ZnO NPs, their oxidation state can be tuned and excitonic peak enlarges, indicating that lattice becomes more disordered. The AFM interactions found in paramagnetic NPs become stronger as Fe content increases.
In this paper, Raman spectroscopy was used to investigate the chemical and structural properties of citrate-coated Fe/sub 3/O/sub 4/ CoFe/sub 2/O/sub nanoparticles. The data obtained from two samples investigated are compared with literature bulk maghemite hematite. discuss higher stability 4/-based sample in comparison sample, when submitted optical illumination at different intensities.
We report on the strong temperature-dependent thermal expansion, αD, in CdS quantum dots (QDs) embedded a glass template. have performed systematic study by using first-order Raman spectra, bulk and dot samples, order to assess size dependence of where role compressive strain provoked host matrix response is discussed. Grüneisen mode parameters anharmonic coupling constants for small with mean radius R ∼ 2.0 nm. found that γ change, respect CdS, range between 20 50%, while anharmonicity...
This article reports the effects of gamma radiation on structural, optical and magnetic properties monolayer tungsten disulfide (WS<sub>2</sub>) grown by a scalable van der Waals epitaxial (VdWE) process SiO<sub>2</sub>coated Si substrate.
Photodynamic therapy (PDT) mediated by photosensitizers loaded in nanostructures as solid lipid nanoparticles has been pinpointed an effective and safe treatment against different skin cancers. Amazon butters have interesting composition when it comes to forming (SLN). In the present report, a new third-generation photosensitizing system consisting of aluminum-phthalocyanine associated with butter-based (SLN-AlPc) is described. The SLN was developed using murumuru butter, monodisperse...