A5021709340- Ferroelectric and Piezoelectric Materials
- Multiferroics and related materials
- Electronic and Structural Properties of Oxides
- Magnetic and transport properties of perovskites and related materials
- Nanoparticles: synthesis and applications
- Nanowire Synthesis and Applications
- Shape Memory Alloy Transformations
- Advanced Electron Microscopy Techniques and Applications
- Catalytic Processes in Materials Science
- Air Quality and Health Impacts
- ZnO doping and properties
- Carbon Nanotubes in Composites
- Gas Sensing Nanomaterials and Sensors
- Perovskite Materials and Applications
- Characterization and Applications of Magnetic Nanoparticles
- Acoustic Wave Resonator Technologies
- Advanced Condensed Matter Physics
- Microwave Dielectric Ceramics Synthesis
- Dielectric properties of ceramics
- Advanced X-ray Imaging Techniques
- Electron and X-Ray Spectroscopy Techniques
- Semiconductor materials and interfaces
- Digital Holography and Microscopy
- Orbital Angular Momentum in Optics
- Luminescence and Fluorescent Materials
Swiss Federal Laboratories for Materials Science and Technology
2017-2023
Paul Scherrer Institute
2021
University of Geneva
2021
Swiss Light Source
2021
Institute of Materials for Electronics and Magnetism
2013-2020
Istituto Nanoscienze
2017
Institute for Microelectronics and Microsystems
2017
University of Ottawa
2017
University of Rochester
2017
Institute for Advanced Studies in Basic Sciences
2017
Titanium dioxide nanoparticles (TiO2NPs) suspensions (concentration 1.0 g/L) in synthetic sweat solution were applied on Franz cells for 24 h using intact and needle-abraded human skin. content into skin receiving phases was determined. Cytotoxicity (MTT, AlamarBlue® propidium iodide, PI, uptake assays) evaluated HaCat keratinocytes after h, 48 seven days of exposure. After exposure, no titanium detectable solutions both damaged found the epidermal layer exposure (0.47 ± 0.33 μg/cm2) while...
Abstract Material surfaces encompass structural and chemical discontinuities that often lead to the loss of property interest in so-called dead layers. It is particularly problematic nanoscale oxide electronics, where integration strongly correlated materials into devices obstructed by thickness threshold required for emergence their functionality. Here we report stabilization ultrathin out-of-plane ferroelectricity heterostructures through design an artificial flux-closure architecture....
In light of recent developments in nanotechnologies, interest is growing to better comprehend the interaction nanoparticles with body tissues, particular within cardiovascular system. Attention has recently focused on link between environmental pollution and diseases. Nanoparticles <50 nm size are known pass alveolar–pulmonary barrier, enter into bloodstream induce inflammation, but direct pathogenic mechanisms still need be evaluated. We thus our attention titanium dioxide (TiO2)...
The ultimate challenge for the development of new multiferroics with enhanced properties lies in achieving nanoscale control coupling between different ordering parameters. In oxide-based multiferroics, substitutional cation dopants offer unparalleled possibility to modify both electric and magnetic at a local scale. Herein it is demonstrated formation dopant-controlled polar pattern BiFeO3 leading spontaneous instauration periodic polarization waves. particular, nonpolar Ca-doped rich...
Abstract The secondary nature of polarization in improper ferroelectrics promotes functional properties beyond those conventional ferroelectrics. In technologically relevant ultrathin films, however, the ferroelectric behavior remains largely unexplored. Here, we probe emergence coupled and primary distortive order parameter thin films hexagonal YMnO 3 . Combining state-of-the-art situ characterization techniques separately addressing state its driving force, reveal a pronounced thickness...
We identify a transient enhancement of the depolarizing field, leading to an unexpected quench net polarization, during growth prototypical metal-ferroelectric-metal epitaxial system made BaTiO_{3} and SrRuO_{3}. Reduced conductivity and, hence, charge screening efficiency in early stage SrRuO_{3} top electrode promotes breakdown ferroelectric into domains. demonstrate how thermal annealing procedure can recover single-domain state. By tracking polarization state situ, using optical second...
First evidence of in vitro cytocompatibility SiC/SiO2 core-shell nanowires is reported. Different internalization mechanisms by adenocarcinomic alveolar basal epithelial cells, monocytic cell line derived from an acute leukemia, breast cancer and normal human dermal fibroblasts are shown. The occurs mainly for macropinocytosis sporadically direct penetration all models considered, whereas it occurred phagocytosis only leukemia cells. the proved analysis proliferation, cycle progression,...
Skin absorption and toxicity on keratinocytes of cobalt oxide nanoparticles (Co3O4NPs) have been investigated. Co3O4NPs are commonly used in industrial products biomedicine. There is evidence that these can cause membrane damage genotoxicity vitro, but no data available their skin cytotoxicity keratinocytes. Two independent 24 h vitro experiments were performed using Franz diffusion cells, intact (experiment 1) needle-abraded human 2). at a concentration 1000 mg/L physiological solution as...
Aurivillius phases constitute a promising class of materials displaying excellent ferroelectric properties, which make them fascinating potential candidates for ferroelectric-based devices. In this perspective, however, the realization thin films still represents an open challenge. work, high-quality single-crystalline Bi5FeTi3O15 are grown by pulsed laser deposition. Their structural and polar properties elucidated combining several atomic-resolution scanning transmission electron...
Dual-ion batteries (DIBs) are electrochemical energy storage devices that operate by the simultaneous participation of two different ion species at anode and cathode rely on use an electrolyte can withstand high operation potential cathode. Under such conditions cathode, issues associated with irreversible capacity loss formation solid–electrolyte interphase surface highly porous electrode materials far less significant than lower potentials, permitting exploration area, permanently...
Abstract Layered ferroelectrics, often referred to as natural superlattices, exhibit functionalities beyond those of the classical ferroelectric perovskite compounds due their highly anisotropic structure. Unfortunately, layered architecture has been impeding growth single crystalline thin films, and thus integration into oxide‐electronic devices. Here, fatigue‐free switching in epitaxial Bi 5 FeTi 3 O 15 films is demonstrated. The achievement twin‐free with sub‐unit‐cell thickness precision...
Phase transition points can be used to critically reduce the ionic migration activation energy, which is important for realizing high-performance electrolytes at low temperatures. Here, we demonstrate a route toward low-temperature thermionic conduction in solids, by exploiting lowered energy associated with oxygen transport Ca-substituted bismuth ferrite (Bi1-xCaxFeO3-δ) films. Our demonstration relies on finding that compositional phase occurs varying Ca doping ratio across xCa ≃ 0.45...
Giant magnetically induced twin variant reorientation, comparable in intensity with bulk single crystals, is obtained epitaxial magnetic shape-memory thin films. It found to be tunable and spatial response by the fine control of microstructural patterns at nanoscopic microscopic scales. A thorough experimental study (including electron holography) allows a multiscale comprehension phenomenon. As service our authors readers, this journal provides supporting information supplied authors. Such...
Charged domain walls in ferroelectrics hold great promise for the design of novel electronic devices due to their enhanced local conductivity. In fact, charged show unique properties including possibility being created, moved and erased by an applied voltage. Here, we demonstrate that are constituted a core region where most screening charge is localized such accumulation responsible particular, link between structural distortions phenomena 109° tail-to-tail BiFeO3 elucidated series...
Quantum wires (QWRs) form naturally when growing strain balanced InGaAs/GaAsP multi-quantum wells (MQW) on GaAs [100] 6° misoriented substrates under the usual growth conditions. The presence of instead could have several unexpected consequences for performance MQW solar cells, both positive and negative, that need to be assessed achieve high conversion efficiencies. In this letter, we study QWR properties from point view their as cells by means transmission electron microscopy, time...
The development of energy-efficient nanoelectronics based on ferroelectrics is hampered by a notorious polarization loss in the ultrathin regime caused unscreened polar discontinuity at interfaces. So far, engineering charge screening either bottom or top interface has been used to optimize state. Yet, it expected that combined effect both interfaces determines final state; fact more so thinner film is. competition and cooperation between have, however, remained unexplored far. Taking PbTiO3...
KITE is a novel mixed-mode CMOS electron counting ASIC developed for the readout of pixelated semiconductor radiation detectors targeted to 4D STEM applications. The chip features pixel pitch 100 μm arranged in 192 × matrix and can be bump-bonded both Si high-Z sensor materials. design an extremely fast front-end electronics use instant retrigger mechanism allow non-paralyzable mode up above 108 cts/s/pix, which corresponds 300 keV beam current 14 pA/pix. massive parallel combination with...
By varying the growth conditions in chemical vapour deposition synthesis we demonstrate possible tuning of core–shell ratio SiC/SiO<sub>2</sub> nanowires.
Abstract Magnetic shape memory materials hold a great promise for next‐generation actuation devices and systems energy conversion, thanks to the intimate coupling between structure magnetism in their martensitic phase. Here novel magnetic free‐standing nanodisks are proposed, proving that lack of substrate constrains enables exploitation new microstructure‐controlled mechanisms by combined application different stimuli–i.e., temperature field. The results show reversible areal strain (up...
Background and Aim Sparse evidence suggests a possible link between exposure to airborne nanoparticles (NPs) cardiovascular (CV) risk, perhaps through mechanisms involving oxidative stress inflammation. We assessed the effects of TiO2 Co3O4 NPs in human circulating angiogenic cells (CACs), which take part vascular endothelium repair/replacement. Methods CACs were isolated from healthy donors' buffy coats after culturing lymphomonocytes on fibronectin-coated dishes endothelial medium for 7...
A detailed atomic scale description of the interfaces between cerium oxide and metals is necessary for a clear understanding interfacial interactions, it may open way to optimization properties combined material in view its applications. In this study interface epitaxial films (111) surface platinum studied by aberration‐corrected scanning transmission electron microscopy ab initio density functional theory calculations. Local modifications registry lattices occurrence nanometric islands at...
A new system based on a Co film covered by ZnO nanorods has been fabricated with sputtering technique. It represents promising candidate for future generation of magnetic gas sensing devices.
The prominent magnetoelectric (ME) effect in ME composites usually originates from an interfacial strain-mediated coupling between ferroelectric and ferromagnetic components. While composite bilayer thin films have been proposed for microdevice applications, the is diminished because of substrate clamping effect. Here, we apply simple CMOS/MEMS compatible top-down fabrication techniques to BaTiO3 (BTO) CoFe2O4 (CFO) epitaxial control clamping. We found augmented micro-patterned compared...