A5009739174- Physics of Superconductivity and Magnetism
- ZnO doping and properties
- Luminescence Properties of Advanced Materials
- Catalytic Processes in Materials Science
- Superconductivity in MgB2 and Alloys
- Semiconductor materials and devices
- Ferroelectric and Piezoelectric Materials
- Mesoporous Materials and Catalysis
- Photonic and Optical Devices
- Copper-based nanomaterials and applications
- Advanced Condensed Matter Physics
- Acoustic Wave Resonator Technologies
- Gas Sensing Nanomaterials and Sensors
- Covalent Organic Framework Applications
- Electronic and Structural Properties of Oxides
- Transition Metal Oxide Nanomaterials
- Copper Interconnects and Reliability
- Magnetic and transport properties of perovskites and related materials
- Advanced Photocatalysis Techniques
- Perovskite Materials and Applications
- Electrophoretic Deposition in Materials Science
- Magnetic properties of thin films
- Inorganic Fluorides and Related Compounds
- Nanoplatforms for cancer theranostics
- nanoparticles nucleation surface interactions
Ghent University
2016-2025
Ghent University Hospital
2016-2021
Stockholm University
2020
Karlsruhe Institute of Technology
2020
Multidisciplinary Digital Publishing Institute (Switzerland)
2019
Southwest University
2019
Université Mustapha Stambouli de Mascara
2019
Chinese Academy of Sciences
2019
Hubei University of Automotive Technology
2019
University College Ghent
2018
Abstract This work presents a novel anticounterfeiting strategy based on material changing its emission color in response to change the excitation sources—where single ultraviolet (UV) or near‐infrared (NIR) light source are employed simultaneously using two sources (xenon lamp and NIR laser). Following this approach, various combinations of lanthanide (Ln 3+ )‐doped LiLuF 4 /LiYF core/shell nanoparticles prepared, providing promising route design flexible nanomaterials, as well already...
Abstract Lanthanide‐doped luminescent nanoparticles are an appealing system for nanothermometry with biomedical applications due to their sensitivity, reliability, and minimal invasive thermal sensing properties. Here, four unique hybrid organic–inorganic materials prepared by combining β‐NaGdF 4 PMOs (periodic mesoporous organosilica) or mSiO 2 (mesoporous silica) proposed. PMO/mSiO excellent candidates biological/biomedical as they show high biocompatibility the human body. On other hand,...
Abstract Covalent Organic Frameworks (COFs), an emerging class of crystalline porous materials, are a new type support for grafting lanthanide ions (Ln 3+ ), which can be employed as ratiometric luminescent thermometers. In this work we have shown that COFs co‐grafted with (Eu , Tb ) and Cu 2+ (or potentially other d‐metals) synchronously both nanothermometer catalyst during chemical reaction. The performance the thermometer could tuned by changing grafted d‐metal solvent environment. As...
Core-shell Er,Yb:LiLuF<sub>4</sub> nanocrystals were investigated for their use as high temperature thermometers. However, distribution of the dopants within anticipatedly protective undoped shells was observed, which questions common assumptions.
Although high temperature superconductors are promising for power applications, the production of low‐cost coated conductors with current densities—at magnetic fields—remains challenging. A superior superconducting YBa 2 Cu 3 O 7–δ nanocomposite is fabricated via chemical solution deposition (CSD) using preformed nanocrystals (NCs). Preformed, colloidally stable ZrO NCs added to trifluoroacetic acid based precursor and NCs' stability confirmed up 50 mol% at least 2.5 months. These tend...
The use of an Al2O3- or TiO2-coated layer, deposited by using atomic layer deposition (ALD), was explored to improve the adhesion properties fluoride phosphor particles. K2SiF6:Mn4+ investigated as a benchmark phosphor. Mn4+-doped phosphors show narrow red emission band centered at around 630 nm, making them suitable candidates for component in white light-emitting diodes. In lighting applications, can lower correlated color temperature without sacrificing luminous efficacy radiation....
A methodology of general validity to prepare epitaxial nanocomposite films based on the use colloidal solutions containing different crystalline preformed oxide nanoparticles (ex situ nanocomposites) is reported. The trifluoroacetate (TFA) metal–organic chemical solution deposition route used with alcoholic solvents grow YBa2Cu3O7 (YBCO) films. For this reason stabilizing in polar a challenging goal. We have scalable nanoparticle synthetic methodologies such as thermal and microwave-assisted...
Achieving low cost, safe, reproducible, and high performance superconducting thin films of YBa2Cu3O7−δ is essential to bring this material the energy market. Here, we report on chemical solution deposition nanocomposites from environmentally benign precursors with a fluorine content. Preformed ZrO2 nanocrystals (3.5 nm) were stabilized in methanolic precursor via two strategies: charge stabilization steric stabilization. Counterintuitively, did not result quality layers, while resulted...
Abstract The heterogeneous integration of ferroelectric BaTiO 3 thin films on silicon (Si) and nitride (SiN)‐based platforms for photonic integrated circuits (PICs) plays a crucial role in the development future nanophotonic film modulators. Since electro‐optic (EO) properties strongly depend their crystal phase texture, these is far from trivial. So far, conventional route using SrTiO template combination with high vacuum deposition methods has been developed, but it low throughput,...
Inherent substrate selectivity is reported for the thermal RuO4 (ToRuS)/H2 gas atomic layer deposition (ALD) process on H-terminated Si (Si–H) versus SiO2. In situ spectroscopic ellipsometry (SE) detected Ru growth from first cycle blanket Si–H, whereas SiO2, 60 cycles were needed to detect growth. Area-selective was evaluated a patterned with 1–10 μm wide Si–H lines separated by 10 SiO2 regions. Ex planar scanning electron microscopy and cross-sectional high-resolution transmission...
Chemical solution deposition (CSD) of YBa2Cu3O7−δ (YBCO) nanocomposites from colloidal precursor solutions containing double metal oxide preformed nanocrystals is a promising, cost-effective, and reproducible approach to producing superconducting films with high critical current density (Jc) enhanced pinning. Here, the influence nanocrystal composition on microstructure properties YBCO nanocomposite studied, focus establishing simple scalable process grow that can be transferred nanoadded...
In this study, we report hybrid crystalline lanthanide-containing 3D covalent organic framework (Ln@3D COF) materials that are suitable for temperature sensing applications. Different routes to obtain these were tested and compared material quality thermometric properties. the first approach, a bipyridine-containing COF (Bipy was grafted with range of visible emitting lanthanide (Eu3+, Tb3+, Dy3+, Eu3+/Tb3+) β-diketonate complexes. second novel nanocomposite prepared by embedding NaYF4:Er,Yb...
In contrast to the widely studied electrical properties of Pb(Zr,Ti)O3 thin films, which have led their applicability in various application areas such as film capacitors, microelectronics, and ferroelectric memories, electro-optic (EO) are far less studied, hinders films for EO applications heterogeneously integrated phase modulators silicon (Si) photonics. Therefore, need be further investigated pave way applications. As strongly depend on crystal texture, turn influenced by method...
In the present study, for first time, aluminum-doped zinc oxide (AZO) thin films with nanoinclusions of amorphous carbon have been synthesized via spin coating, and thermoelectric performances were investigated varying aging period solution, procedure nanoparticles’ addition, annealing atmosphere. The addition nanoparticles has pursued to introduce phonon scattering centers reduce thermal conductivity. All samples showed a strong orientation along [002] crystallographic direction, even...
The heterogeneous integration of ferroelectric thin films on silicon- or silicon nitride-based platforms for photonic integrated circuits plays a crucial role in the development nanophotonic film modulators. For this purpose, an ultrathin seed was recently introduced as method such BaTiO3 and Pb(Zr,Ti)O3. One issue with self-orienting is that non-planarized circuits, it fails to act template films. To circumvent problem, we propose planarization without need wafer-scale chemical mechanical...
Ligand exchange is a crucial step between nanocrystal synthesis and application. Although colloidal stability ligand in nonpolar media are readily established, the of native, hydrophobic ligands with polar less systematic. In this paper, we present versatile strategy for phase transfer carboxylic acid capped HfO2 ZrO2 nanocrystals to various solvents, based on small amino acids as incoming ligand. To gain insight fundamental mechanism exchange, study system combination FTIR, zeta potential...
Abstract Striving to improve the critical current density Jc of superconducting YBa 2 Cu 3 O 6+x (YBCO) thin films via enhanced vortex pinning, interplay between film growth mechanisms and formation nanosized defects, both natural artificial, is systematically studied in undoped BaZrO (BZO)-doped YBCO films. The were grown pulsed laser deposition (PLD), varying crystal grain size targets addition dopant content. microstructure PLD target has been observed have a great impact on that...
Bipyridine covalent triazine framework (bpyCTF) was used as a support material for the development of highly efficient Rh catalyst. The heterogeneous catalyst applied both batch and flow transfer hydrogenation various N-heteroarenes.
Covalent organic frameworks (COFs) are emerging as a new class of photoactive semiconductors, which possess crystalline ordered structures and high surface areas. COFs can be tailor-made toward specific (photocatalytic) applications, the size position their band gaps tuned by choice building blocks linkages. However, many types still unexplored photocatalytic moieties scope reactions photocatalyzed remains quite limited. In this work, we report synthesis application two bipyridine- or...
Enhanced green emission in YOF:Yb 3+ ,Er particles, achieved through metal ion co-doping, holds potential for thermometry. Toxicity assessments on NHDFs explore their suitability drug delivery.
To reduce the fabrication costs while maximizing superconducting and pinning properties of YBa2Cu3O7−δ (YBCO) nanocomposite films, drop-on-demand ink-jet printing technique was used to deposit colloidal YBCO inks onto LaAlO3 substrates. These containing preformed HfO2 nanocrystals were carefully adjusted, prior jettability, as droplet formation depends on rheological themselves. After adjusting parameters, 450-nm thick pristine films with a self-field critical current density (Jc) 2.7 MA...
Zr-metal organic frameworks (MOFs) are water-stable materials with high surface properties and chemical stabilities often employed for catalysis. They can also become hosts various upconverting nanoparticles via self-assembly, which opens up possibilities to use such nanocomposite combined catalysis–thermometry applications. In our work, we show that the NaGdF4:Er,Yb@UiO-66-NH2, NaGdF4:Tm,Yb@UiO-66-NH2, NaYF4:Er,Yb@NaYF4@UiO-66-NH2 display excellent temperature-dependent luminescence...
The flux pinning properties of the high temperature superconductor YBa2Cu3O7-δ (YBCO) have been conventionally improved by creating both columnar and dot-like centres into YBCO matrix. To study effects differently doped multilayer structures on pinning, several samples consisting a multiple number individually BaZrO3 (BZO) BaCeO3 (BCO) layers were fabricated. In matrix, BZO forms BCO defects. structure improves capability throughout whole angular range, giving rise to critical current...
Due to the beneficial properties of silver, it is anticipated that number commercially available applications will keep growing during next decade. In this study, 14 different commercial products claim contain solid silver were characterized by visual analysis, UV-VIS spectroscopy, inductive coupled plasma optical emission spectrometry (ICP-OES), scanning transmission electron microscopy with energy dispersive x-ray spectroscopy (STEM-EDX), and dynamic light scattering (DLS). Moreover...
Lanthanide-based luminescent nanoparticles that are thermally responsive can be used to probe temperature changes at a nanoscale regime. However, materials work as both nanothermometer and catalyst limited. Herein, we show covalent organic frameworks (COFs), which is an emerging class of porous crystalline materials, grown around lanthanide create unique core–shell nanostructures. In this way, the COF (shell) supports copper metal ions catalytic sites simultaneously (β-NaLuF4:Gd,Er,Yb—core)...