A5024586392- Gold and Silver Nanoparticles Synthesis and Applications
- Nanocluster Synthesis and Applications
- Quantum Dots Synthesis And Properties
- Copper-based nanomaterials and applications
- Nanomaterials for catalytic reactions
- Iron oxide chemistry and applications
- Laser-Ablation Synthesis of Nanoparticles
- Magnetic properties of thin films
- Magnetic Properties and Synthesis of Ferrites
- Plasmonic and Surface Plasmon Research
- Characterization and Applications of Magnetic Nanoparticles
- Nonlinear Optical Materials Studies
- Magnetic and transport properties of perovskites and related materials
- Electrocatalysts for Energy Conversion
- Nanoparticles: synthesis and applications
- Molecular Junctions and Nanostructures
- Electronic and Structural Properties of Oxides
- nanoparticles nucleation surface interactions
- Advanced Condensed Matter Physics
- Mesoporous Materials and Catalysis
- Advanced biosensing and bioanalysis techniques
- Luminescence and Fluorescent Materials
- Electrochemical sensors and biosensors
- Catalytic Processes in Materials Science
- Health and Lifestyle Studies
Universidade de Vigo
2012-2023
Servicio Gallego de Salud
2023
Universidade Nova de Lisboa
2023
Galicia Sur Biomedical Foundation
2023
Universidade de São Paulo
2017
International Iberian Nanotechnology Laboratory
2010-2014
Dirección Regional de Salud del Callao
2013
University of Duisburg-Essen
2008-2009
University of Bayreuth
2008
Technische Universität Berlin
2008
Multipod Au nanoparticles (nanostars) with single crystalline tips were synthesized in extremely high yield through the reduction of HAuCl4 a concentrated solution poly(vinylpyrrolidone) (PVP) N,N-dimethylformamide (DMF), presence preformed nanoparticle seeds, but no need for external energy sources. Nanostar dispersions display well-defined optical response, which was found (through theoretical modeling) to comprise main mode confined within and secondary central body. Calculations surface...
Regular gold nanodecahedra (pentagonal bipyramids) are obtained in high yield through ultrasound-induced reduction of HAuCl4 by dimethylformamide on presynthesized seeds (see figure). A dependence the final morphology crystalline structure is demonstrated growing single-crystal platinum nanoparticles, which yields uniform octahedra. Resolution Maxwell's equations for bicones shows good agreement with experimental optical properties. Supporting information this article available WWW under...
The use of plasmonic metal nanoparticles as photosensitizers has undergone a strong development in the past few years given their ability to increase activity semiconductors into visible and near-infrared regions. present work reports an experimental theoretical study on critical influence that shape anisotropy gold exerts photocatalytic performance Au–TiO2 nanoarchitectures. obtained results show for amount metallic material, Au nanostars endow titania with strongly enhanced catalytic...
Core–shell and multishell bimetallic AuAg nanoparticles have been synthesized by successive reduction of metal salts with ascorbic acid on pre-made seeds in the presence a cationic surfactant, cetyltrimethylammonium bromide (CTAB). The coverage is extremely uniform, although some cases deviations from spherical shape are observed formation nanorods or nanoprisms. evolution optical properties as further layers deposited very dramatic can be modelled using Mie theory for multilayer spheres....
The synthesis of monodispersed, amorphous cobalt nanoparticles coated with silica in aqueous/ethanolic solution is described. Both the core size and shell thickness can be controlled through synthetic conditions. Furthermore, transformation cores into crystalline, metallic upon annealing air demonstrated X-ray diffraction data. initial, their crystalline counterpart are magnetic, which promises important applications for ferrofluid preparation magnetic recording media.
Gold nanorods with well-defined aspect ratios are homogeneously incorporated within poly(vinyl alcohol) thin films and subsequently aligned by heating stretching the nanocomposite films. The spatial alignment of is directly proved using transmission electron microscopy. polarization-dependent optical response rods measured compared a dipole model. Excellent agreement found. Additionally, irradiation film nanosecond laser pulses (1064 nm) leads to selective reshaping into nanospheres, we...
Silver nanoprisms with strong absorption in the near-IR have been synthesized using a modification of photoinduced method by illuminating preformed silver seeds under different illumination conditions. Low-intensity light-emitting diodes and white light combined color filters are used as sources. The lateral dimensions found to be correlated quasilinear fashion emission wavelength position main in-plane dipole plasmon band. structural characterization Ag nanoparticles, carried out scanning...
Abstract A simple method for the preparation of iron/iron oxide nanoparticles with core/shell cubic morphology is presented. The synthesis nanocubes was carried out through decomposition a preformed iron oleate complex at high temperature. Although this procedure has been shown previously to produce monodisperse magnetite spheres, [1] use squalene as solvent and presence sodium found induce cube formation. detailed high‐resolution transmission electron microscopy (HRTEM) analysis performed...
The volume phase transition of colloidal microgels made N-isopropylacrylamide (NIPAM) is well-studied and it known that the temperature can be influenced by copolymerization. A series poly( N-isopropylacrylamide- co-allylacetic acid) copolymers with different contents allylacetic acid (AAA) was synthesized means a simple radical polymerization approach. thermoresponsive behavior these particles studied using dynamic light scattering (DLS). Further characterization done employing transmission...
A new face of nanorod crystallinity: The structure single-crystal gold nanorods is reinterpreted on the basis high-resolution transmission electron microscopy standing rods. studies provided evidence for eight identical higher-index {250} lateral facets (see picture TEM image and proposed model). Detailed facts importance to specialist readers are published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made available submitted by authors....
Single-crystalline Cu nanoplates with a prominent in-plane dipole surface plasmon band are fabricated through reduction of copper salt hydrazine using PVP as stabilizer and no need for inert atmosphere. Due to the lower free-electron character copper, interband transitions overlap, therefore damp, out-of-plane resonance (see image). Detailed facts importance specialist readers published "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made...
Plasmon modes of the exact same individual gold nanoprisms are investigated through combined nanometer-resolved electron energy-loss spectroscopy (EELS) and cathodoluminescence (CL) measurements. We show that CL only probes radiative modes, in contrast to EELS, which additionally reveals dark modes. The combination both techniques on particles thus provides complementary information also demonstrates although give rise very similar spatial distributions when probed by EELS or CL, their...
The synthetic architectures of complex inorganic nanostructures, including multifunctional hollow capsules, are expected to play key roles in many different applications, such as drug delivery, photonic crystals, nanoreactors, and sensing. Implementation novel strategies for the fabrication materials is needed because infancy this knowledge, which still limits progress certain areas. Herein we report a straightforward approach development submicron reactors comprising catalytic gold...
We describe the modulation of localized surface plasmons in gold nanodumbbells through stepwise silver coating, along with a detailed discussion regarding experimental parameters affecting final core−shell morphology. Interestingly, whereas conformal growth was observed for thin coatings, intermediate and high salt concentrations, nanoparticles end up either rod-like or irregular faceted morphologies as consequence anisotropic growth. Upon reduction, pronounced changes optical properties...
Changing faces: The shape of gold nanorods can be finely tuned by controlled growth under sonication in DMF the presence poly(vinylpyrrolidone). Reshaping involves formation rods with sharp tips and strongly faceted lateral faces, ultimately leads to perfect, single-crystal octahedrons (see images). Mechanistic considerations indicate a shape-inducing effect polymer through different binding interactions for faces. Supporting information this article is available on WWW...
This paper describes morphological and optical changes induced by seed-mediated growth of gold nanorods in the presence iodide ions. Addition small amounts to solution results nanoparticles with dumbbell-like structure, meaning that salt reduction takes place preferentially at rod tips. However, when excess is added, homogeneous observed, therefore original shape retained. By controlling experimental conditions, position longitudinal plasmon band grown can be shifted up as much 250 nm. These...
Feature film: Thin films made by exponential layer-by-layer growth display high diffusivity and can be readily infiltrated with inorganic nanoparticles. They sequestrate molecular systems from solution as a function of the composition their layers, while providing intense surface-enhanced Raman scattering (SERS) signals (see picture).
Gold nanorods were used as seeds for platinum growth, using a mild reducing agent, ascorbic acid, in the presence of cationic surfactant cetyltrimethylammonium bromide (CTAB). Highly preferential growth on tips or complete overcoating can be achieved by manipulation reduction conditions, among which silver ions was found to highly dominant. In either case, epitaxial, demonstrated high resolution electron microscopy and Fourier transform analysis. Additionally, deposition mode leads very...
Rational nanostructure manipulation has been used to prepare nanocomposites in which multiwalled carbon nanotubes (MWCNTs) were embedded inside mesoporous layers of oxides (TiO(2), ZrO(2), or CeO(2)), turn contained dispersed metal nanoparticles (Pd Pt). We show that the MWCNTs induce crystallization oxide layer at room temperature and shell allows particles be accessible for catalytic reactions. In contrast samples prepared absence MWCNTs, both activity stability core-shell catalysts is...
It happens inside: Highly active nanoreactors are prepared by encapsulating dendritic Pt nanoparticles (NPs) grown on a polystyrene template inside hollow porous silica capsules. The catalytic activity of these NPs is preserved after encapsulation and removal. Different metals, such as Ni, can thus be reduced the capsules, thereby leading to formation composites with tunable magnetic properties.
Herein we describe a one-step method for the preparation of single-crystal, dendritic Pt nanoparticles with no need organic solvents, templates, or seeded growth. It is shown that two different shapes—spherical dendritic—can be efficiently supported onto sidewalls carbon nanotubes. Notably, nanostructrures yield unprecedented catalytic activity, evidenced through lowest activation energy within an electron-transfer reaction as compared those reported in literature nanostructures.
Changing the shape of things to come! [email protected] core–shell nanostructures with tailored morphology, ranging from nanorods all way spheres, through octahedrons (see picture), can be easily fabricated at room temperature selective reduction Ag+ ions onto surface Au by using hydroquinone as a reducing agent. Detailed facts importance specialist readers are published "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made available submitted...
Cobalt oxide octahedra were synthesized by thermal decomposition. Each octahedron-shaped nanoparticle consists of an antiferromagnetic CoO core enclosed eight {111} facets interfaced to a thin (∼4 nm) surface layer strained Co3O4. The nearly perfectly octahedral shaped particles with 20, 40, and 85 nm edge length show weak room-temperature ferromagnetism that can be attributed ferromagnetic correlations appearing due lattice configurations at the CoO/Co3O4 interface.