A5022614278- Luminescence Properties of Advanced Materials
- Advanced Photocatalysis Techniques
- Gas Sensing Nanomaterials and Sensors
- Crystallization and Solubility Studies
- Transition Metal Oxide Nanomaterials
- X-ray Diffraction in Crystallography
- Pigment Synthesis and Properties
- Catalytic Processes in Materials Science
- Microwave Dielectric Ceramics Synthesis
- Supercapacitor Materials and Fabrication
- Electrocatalysts for Energy Conversion
- Copper-based nanomaterials and applications
- Crystal Structures and Properties
- Ferroelectric and Piezoelectric Materials
- Lanthanide and Transition Metal Complexes
- Advanced Nanomaterials in Catalysis
- Quantum Dots Synthesis And Properties
- ZnO doping and properties
- Chalcogenide Semiconductor Thin Films
- Polyoxometalates: Synthesis and Applications
- Nanomaterials for catalytic reactions
- Covalent Organic Framework Applications
- Aerogels and thermal insulation
- Nanoporous metals and alloys
- Mesoporous Materials and Catalysis
Universidade Federal do Maranhão
2022-2024
Universidade Estadual Paulista (Unesp)
2021-2022
Universitat Jaume I
2021-2022
Universidade Federal de São Carlos
2010-2021
Brunel University of London
2016-2018
Institutul Naţional de Cercetare-Dezvoltare pentru Mecatronică si Tehnica Masurării
2015
The present joint experimental and theoretical work provides in-depth understanding on the morphology structural, electronic, optical properties of ZnWO4 nanocrystals. Monoclinic nanocrystals were prepared at three different temperatures (140, 150, 160 °C) by a microwave hydrothermal method. Then, samples investigated X-ray diffraction with Rietveld refinement analysis, field-emission scanning electron microscopy, transmission electronic micro-Raman Fourier transform infrared spectroscopy,...
CaWO4:Eu3+ microcrystals (with 0, 1, 2 and 4 mol% Eu3+) were synthesized by a co-precipitation (CP) method grown in microwave-assisted hydrothermal (MAH) system at 130 °C for 30 min. X-ray diffraction (XRD), Rietveld refinement, absorption near edge spectroscopy (XANES), Fourier-transform Raman (FT-Raman) infrared (FT-IR) indicated that all of the have scheelite-type tetragonal structure without deleterious phases. Structural refinement data employed to model [CaO8], [EuO8] [WO4] clusters....
Europium doped silver tungstates α-Ag<sub>2−3x</sub>Eu<sub>x</sub>WO<sub>4</sub>(<italic>x</italic>= 0, 0.0025, 0.005, 0.0075 and 0.01 mol) were synthesized by the coprecipitation method at 90 °C for 30 minutes. PL spectra showed a broad band related to [WO<sub>6</sub>] group characteristic narrow peaks due f–f transitions of Eu<sup>3+</sup>as result efficient energy transfer from matrix.
A theoretical study was elaborated to support the experimental results of Zn-doped α-Ag2WO4. Theses α-Ag2–2xZnxWO4 (0 ≤ x 0.25) solid solutions were obtained by coprecipitation method. X-ray diffraction data indicated that all microcrystals presented an orthorhombic structure. The values micro-Raman frequencies in reasonable agreement with both previously reported and calculated results. Microscopy images showed replacement Ag+ Zn2+ promoted a reduction average crystal size modifications...
In this work, we investigated the effects of chemical substitution on structural, electronic, and optical properties α-Ag2-2xNixWO4 (0 ≤ x 0.08) solid solutions prepared by a facile microwave-assisted hydrothermal method. The results showed that increase Ni concentration in α-Ag2WO4 microcrystals as host matrix caused morphological transformation shift electronic properties. Based first principles calculations using Wulff's construction, particle shapes their transformations can be affected...
We present a study of the controlled synthesis and optical properties single-crystals Gd(OH)3, GdOOH Gd2O3 nanorods. In this work, Gd(OH)3 nanorods were synthesized by simple fast microwave-assisted hydrothermal method. This process combined with thermal decomposition oxidation as precursors enabled preparation single-crystalline structures well-defined morphology at low temperatures. The crystal structure dependence on was investigated. observed green shift effect photoluminescence (PL)...
In the current COVID-19 pandemic, next generation of innovative materials with enhanced anti-SARS-CoV-2 activity is urgently needed to prevent spread this virus within community. Herein, we report synthesis chitosan/α-Ag2WO4 composites synthetized by femtosecond laser irradiation. The antimicrobial against Escherichia coli, Methicilin-susceptible Staphylococcus aureus (MSSA), and Candida albicans was determined estimating minimum inhibitory concentration (MIC) minimal bactericidal/fungicidal...
Here, an experimental study is presented on the structural, electronic, and optical properties of Bi2-xMoO6:xEu3+ (x = 0, 0.5, 1.0, 2.0, 4.0 mol%) materials, synthesized by means microwave-assisted solvothermal method using ethylene glycol as a solvent. Different characterization techniques (X-ray diffraction measurements with Rietveld refinements, Raman ultraviolet–visible diffuse reflectance spectroscopy, field emission scanning electron microscopy, photoluminescence emissions) have been...