A5043664747- ZnO doping and properties
- Magnetic properties of thin films
- Magnetic and transport properties of perovskites and related materials
- Physics of Superconductivity and Magnetism
- Copper-based nanomaterials and applications
- Catalytic Processes in Materials Science
- Supercapacitor Materials and Fabrication
- Theoretical and Computational Physics
- Gas Sensing Nanomaterials and Sensors
- Luminescence Properties of Advanced Materials
- Carbon and Quantum Dots Applications
- Electrocatalysts for Energy Conversion
- Laser-Ablation Synthesis of Nanoparticles
- Advanced Condensed Matter Physics
- Diamond and Carbon-based Materials Research
- Catalysis and Hydrodesulfurization Studies
- Catalysis for Biomass Conversion
- Electrochemical Analysis and Applications
- Electrochemical sensors and biosensors
- Electronic and Structural Properties of Oxides
- Catalysts for Methane Reforming
- Characterization and Applications of Magnetic Nanoparticles
- Advancements in Battery Materials
- Magnetic Properties and Synthesis of Ferrites
- Advanced Battery Materials and Technologies
Universidade Federal Fluminense
2016-2025
Northeast Forestry University
2025
Instituto de Física La Plata
2021
Tsinghua University
2013
University of Rajasthan
2010-2013
Mohanlal Sukhadia University
2010-2013
University Town of Shenzhen
2013
UGC DAE Consortium for Scientific Research
2011-2013
Centro Brasileiro de Pesquisas Físicas
2006-2011
University of Amsterdam
2004-2007
This article reports on reversible manipulation of room temperature ferromagnetism (RTFM) in nondoped bulk CeO2. The magnetization measurements establish that paramagnetic CeO2 is driven to a ferromagnetic state, without change structure, when vacuum annealed at 600 °C. Ce ions transform from 4+ 3+ accompanied by evolution oxygen vacancies (VO) during the RTFM transition, as determined x-ray photoemission. F+ centers (the electrons singly occupied vacancies) play key role exchange mechanism....
The magnetic properties of core/shell nanoparticles can be finely tuned through the exchange coupling at interface, enabling large heating powers under alternating fields. However, origin their efficiency is still unclear due to complex interplay different mechanisms. Here, we show that monodisperse Fe3O4/CoxZn1–xFe2O4 designed provide for field amplitudes and dispersion media conditions by modulating shell composition thickness. fine control nanoparticles' effective anisotropy provided...
In this work, we demonstrate that room temperature ferromagnetism can be induced in pristine anatase TiO2 paramagnetic bulk powder through extended hydrogenation. Defect complexes, Ti3+–VO (Ti3+ ions accompanied by oxygen vacancies) are clearly identified hydrogenated combining x-ray diffraction and photoemission spectroscopy. The observed ferromagnetic ordering is reversible switched between “on” “off” inducing or removing, respectively, these defect complex. We convincingly elucidate the...
We prepared three distinct MnO<sub>2</sub> nanostructures, and 976 F g<sup>−1</sup> 830 cm<sup>−3</sup> at 5 mV s<sup>−1</sup> were obtained with a perpendicular columnar structure.
Holey graphenic nanomaterials with porosity within the basal plane attract significant interest. It is observed that perforation of graphene can enhance specific surface area nanosheet, ensuring effective wetting and penetration electrolytes to electrode surface, facilitating rapid charge transfer, boosting electrocatalytic efficacy transducers. This study reports first example nitrogen-doped holey reduced oxide a mesoporous morphology (N-MHG). shown N-MHG be synthesized through one-step...
Electronic and magnetic properties of Co-doped TiO2 polycrystalline pellets (Ti0.95Co0.05O2) have been investigated using x-ray diffraction, photoemission, magnetization, resistance measurements. The as-synthesized hydrogenated specimens crystallize in the anatase type tetragonal structure containing very small (∼4.4%) rutile phase. dopant ions Co are found to be divalent well incorporated into lattice, substituting Ti site within phase, with no evidence metallic or any other oxides Co....
The temperature of biological systems is an important parameter to be monitored during metabolic processes and treatment diseases. In this scenario, optical thermometry generally involves the operation sensor within one near-infrared windows, where light has its maximum depth penetration. Here we propose a strategy involving lanthanide-doped inorganic nanocomposite phosphors in which sensing feasible all three windows using single thermometric system. Using low-power CW laser excitation at...