A5042792025- Magnetic properties of thin films
- Gold and Silver Nanoparticles Synthesis and Applications
- Copper-based nanomaterials and applications
- Electron and X-Ray Spectroscopy Techniques
- nanoparticles nucleation surface interactions
- ZnO doping and properties
- Surface and Thin Film Phenomena
- Nanoparticles: synthesis and applications
- Magnetic Properties and Applications
- Catalytic Processes in Materials Science
- Physics of Superconductivity and Magnetism
- Magnetic Properties and Synthesis of Ferrites
- Semiconductor materials and devices
- Graphene research and applications
- Theoretical and Computational Physics
- Laser-Ablation Synthesis of Nanoparticles
- Force Microscopy Techniques and Applications
- Advanced Chemical Physics Studies
- Chalcogenide Semiconductor Thin Films
- Graphene and Nanomaterials Applications
- Metal and Thin Film Mechanics
- Diamond and Carbon-based Materials Research
- Molecular Junctions and Nanostructures
- 2D Materials and Applications
- Surface Modification and Superhydrophobicity
Instituto de Ciencia de Materiales de Madrid
2014-2024
Universidad Autónoma de Madrid
2023
Science Factory
2018-2021
International Council on Mining and Metals
2018-2021
Consejo Superior de Investigaciones Científicas
2010-2020
Instituto de Ciencia de Materiales de Sevilla
2019
Centro Nacional de Microelectrónica
2003-2007
Université Paris-Sud
1993-2003
Daresbury Laboratory
2002
Centre National de la Recherche Scientifique
1994-1997
We present an overview of the main techniques for production and processing graphene related materials (GRMs), as well key characterization procedures. adopt a 'hands-on' approach, providing practical details procedures derived from literature authors' experience, in order to enable reader reproduce results.
Core@shell and core@shell@shell nanoparticles are building blocks for more sophisticated systems a plethora of applications. The one-step generation such complex is reported where the atoms core shell can be easily inverted, avoiding intrinsic constraints chemical methods.
Citric juice-mediated tellurium nanoparticles with biomedical applications.
We present a bottom-up fabrication route based on the sputtering gas aggregation source that allows generation of nanoparticles with controllable and tunable chemical composition while keeping control cluster size. demonstrate particles can be monitored by individual adjustment working parameters magnetrons inserted in zone. Such leads to fine ion density each target material hence nanoparticles. In particular, we show through X-ray photoemission, atomic force microscopy, high-resolution...
Abstract Functional heterofibrous hybrid materials are prepared in an integrative approach from aqueous dispersions of nanofibrillated cellulose and sepiolite by applying high shear homogenization ultrasound irradiation. Both types nanofibers remain physically cross‐linked forming homogeneous very stable high‐viscosity gels that can be shaped as films considered “hybrid nanopapers” well. The presence modifies the surface roughness resulting casting process, which rendered hydrophobic,...
The development of new magnetic refrigerants demands an effective investigation materials with a large magnetocaloric effect in wide temperature range. Herein, we report on the structural, magnetic, and properties two-site disordered double perovskite GdSrCoFeO6 prepared by modified solid-state synthesis method. Temperature-dependent synchrotron X-ray diffraction analysis revealed that crystallizes orthorhombic phase (Pnma), Gd3+/Sr2+ Co2+/3+/Fe3+/4+ ions randomly distributed A- B-sites,...
Core@shell Co@Au nanoparticles of around 8 nm have been produced by the inert gas condensation method, revealing for first time that most exhibit an icosahedral shape in agreement with theoretical prediction. Additionally, we report existence a novel morphology which consists Co icosahedron surrounded fcc Au facets, reported here time.
Nanostructured silver (Ag) and gold (Au) are widely known to be potent biocidal cytotoxic agents as well biocompatible nanomaterials. It has been recently reported that combining both metals in a specific chemical composition causes significant enhancement their antibacterial activity against antibiotic-resistant bacterial strains, anticancer effects, while preserving cytocompatibility properties. In this work, Ag/Au bimetallic nanoparticles over complete atomic range were prepared at 10 at%...
Cancer and antimicrobial resistance to antibiotics are two of the most worrying healthcare concerns that humanity is facing nowadays. Some promising solutions for these problems may come from nanomedicine. While traditional synthesis nanomaterials often accompanied by drawbacks such as high cost or production toxic by-products, green nanotechnology has been presented a suitable solution overcome challenges. In this work, an approach tellurium (Te) nanostructures in aqueous media developed...
The local atomic structure of skutterudite-type compounds derived from CoSb3 plays a pivotal role in tuning their electronic and thermal properties thermoelectric applications. For instance, the shape occurring [Sb4] rings has direct consequences on band convergence and, then, possible enhancement efficiency. In this work, both structures skutterudite were evaluated by X-ray absorption technique. Extended X-ray-absorption fine-structure oscillations at Sb K-edge fitted good agreement to...
We report a tip-based nanofabrication method to generate carbon nanopatterns. The process uses the field-induced transformation of dioxide gas into solid material. It requires application low-to-moderate voltages ∼10–40 V. allow us fabricated sub-25 nm dots and it can be up scaled pattern square centimeter areas. Photoemission spectroscopy shows that is dominating atomic species structures. formation nanostructures oxides by force microscope nanolithography expands its potential providing...
The knowledge of the oxidation state transition metal cations in Sr(2)FeMO(6) (M = W, Mo, Re and Sb) double perovskites is paramount importance to understand their appealing magnetoresistive or magnetic properties. We present a systematic investigation valences Fe, Sb these using three different complementary techniques analysis. have used diffraction method, neutron powder (NPD), coupled with bond-valence model; two spectroscopy methods, X-ray photoemission (XPS) absorption (XAS). These are...
Experimental evidence for magnetothermal behavior in iron-iron oxide nanostructured systems has been obtained using x-ray absorption spectroscopy (XAS) and magnetic circular dichroism (XMCD) at the Fe ${L}_{2,3}$ edges. The purpose of this study is determination blocked state these spin-glass-like core-shell systems. A first overview species participating response was by analyzing XMCD saturating fields. Also, XAS revealed existence an antiferromagnetic FeO phase, likely located interface...
The thermal-induced diffusion at nanoscale is investigated through the detailed study of structural and magnetic properties Co@Au nanoparticles as a function deposition temperature. Nanoparticles 10 nm were fabricated using an ion cluster source from Co95Au5 target. While low-temperature leads to formation alloyed fcc CoAu core with incomplete cobalt oxide shell, higher temperature induces pure hcp Co intermediate Au shell compact outer shell. evolution presented discussed in light changes...
Direct, low temperature, catalyst-free and transfer-free growth of monolayer graphene films on silicon wafer with a native oxide.
The increasing demand for nanostructured materials is mainly motivated by their key role in a wide variety of technologically relevant fields such as biomedicine, green sustainable energy or catalysis. We have succeeded to scale-up type gas aggregation source, called multiple ion cluster the generation complex, ultra-pure nanoparticles made different materials. high production rates achieved (tens g/day) this kind sources, and inherent ability control structure controlled environment, make...
Tin selenide (SnSe) has notable thermoelectric properties, yet stable n-type polycrystalline SnSe is difficult to synthesize. Here, easily prepared by arc-melting as robust pellets, with properties repeatably changing negative Seebeck-coefficient above 580 K reaching a figure of merit ∼1.8 at 816 K. DC conductivity changes 4 orders magnitude temperature, whereas microwave increases only 4-fold, confirming the effects oxidized grain boundaries. Effects ambient oxygen exposure are probed X-ray...
Herein, gas phase synthesis and characterization of multifunctional core@shell, Au@TiOx nanoparticles have been reported. The were produced via a one-step process using multiple-ion cluster source under controlled environment that guaranteed the purity nanoparticles. growth Au cores (6 nm diameter) is stopped when they pass through Ti plasma where are covered by an ultra-thin (1 thick) homogeneous titanium shell oxidized in-flight before soft-landing found to be highly crystalline with...
One of the factors that limit spatial resolution in atomic force microscopy (AFM) is physical size probe. This limitation particularly severe when imaged structures are comparable to tip's apex. The AFM usually enhanced by using sharp tips with high aspect ratios. In present paper we propose an approach modify consists depositing nanoclusters on standard silicon tips. We show use those leads images higher ratios and resolution. has two major properties. It provides aspect-ratio nanoscale...
The study of the magnetic properties Co nanoparticles (with an average diameter 10.3 nm) grown using a gas-phase aggregation source and embedded in Au V matrices is presented. We investigate how matrix, number (counted by coverage percentage), interparticle interactions complex nanoparticles/matrix interface structure define studied systems. A threshold 3.5% monolayer was found both systems: below this coverage, behave as assembly independent single-domain entities with uniaxial anisotropy....
We present a study of the effect gold nanoparticles (Au NPs) on TiO2 charge generation and trapping during illumination with photons energy larger than substrate band gap. used novel characterization technique, photoassisted Kelvin probe force microscopy, to process at single Au NP level. found that photoinduced electron transfer from increases logarithmically light intensity due combined contribution electron-hole pair in space region TiO2-air interface metal-semiconductor junction. Our...
The electronic band structure of GaTe is calculated by numerical atomic orbital density-functional theory, in the local-density approximation. In addition, valence-band dispersion along various directions Brillouin zone determined experimentally angle-resolved photoelectron spectroscopy. Along these directions, good concordance with obtained measurements. It established that a direct-gap semiconductor gap located at Z point, is, Brillouin-zone border direction perpendicular to layers....
The onset of chemical order ($L{1}_{0}$ phase) and perpendicular magnetic anisotropy in $\mathrm{FePd}(001)$ thin films sputtered on $\mathrm{MgO}(001)$ at temperatures from room temperature to $700\phantom{\rule{0.2em}{0ex}}\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}$ thickness between 1.4 $22\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ are investigated. It is found that the formation $\mathrm{FePd}$ ordered phase exhibiting high with $c$ axis growth direction) affected by a two-dimensional...