M. Arturo López-Quintela

M. Arturo López-Quintela
University of Santiago de Compostela | USC · Department of Physical Chemistry

Doctor of Chemistry

About

382
Publications
47,693
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
13,878
Citations
Introduction
M. Arturo López-Quintela currently works at the Department of Physical Chemistry, University of Santiago de Compostela. He does research in Nanotechnology, Materials Chemistry and Physical Chemistry. Current research main interest is in metal clusters: synthesis and catalytic properties.

Publications

Publications (382)
Article
In2S3 thin films were grown on indium tin oxide-coated glass substrates by a chemical spray pyrolysis technique at different substrate temperatures (300 °C, 360 °C, 400 °C and 460 °C). Structural analysis of the deposited films shows a combination of tetragonal and cubic structures. The crystallite size of the films increases with the substrate tem...
Article
Full-text available
In2S3 thin films have been deposited onto glass substrates at 340 °C using an inexpensive spray pyrolysis method (CSP) via the reaction between high purity indium chloride and thiourea. Structural, optical and photoconductive properties of thin films have been investigated by adjusting S/In molar ratio. The X-ray diffraction results revealed that I...
Article
The enhancement of catalysts efficiency of bimetallic nanoparticles depends on the ability to exert control over surface composition. However, results relating surface composition and feeding solution of bimetallic nanoparticles synthesized in microemulsions are controversial and apparently contradictory. In order to comprehend how the resulting su...
Preprint
Full-text available
In2S3 thin films were grown on indium tin oxide (ITO) glass substrate by chemical spray pyrolysis technique at 360°C. The structural analysis of the deposited films shows a combination of tetragonal and cubic structures. The average crystallite size is about 25 nm. The electrical properties of In2S3 thin films have been investigated in a wide frequ...
Article
Full-text available
Indium sulfide (In2S3) thin films have been synthesized on glass substrates using the spray technique (CSP). The S : In molar ratio was varied from 1 to 4 in the starting solution. The Raman analysis confirms the formation of the β-In2S3 material and the absence of a secondary phase. The EDS analysis reveals that our layers are pure. The thin film...
Chapter
The minimum reactant concentration required to synthesize Au/M (M = Ag, Pt, Pd, Ru . . .) core-shell nanoparticles by the one-pot microemulsion route was calculated by a simulation model under different synthesis conditions. This minimum concentration was proved to depend on the reduction potential of the slower metal M and on the rigidity of the s...
Article
The minimum reactant concentration required to synthesize Au/M (M = Ag, Pt, Pd, Ru …) core-shell nanoparticles by the one-pot microemulsion route was calculated by a simulation model under different synthesis conditions. This minimum concentration was proved to depend on the reduction potential of the slower metal M and on the rigidity of the surfa...
Article
Full-text available
The purpose of this paper is to compare the influence of boron and phosphor doping on the optical, structural and electrical properties of hydrogenated amorphous silicon (a-Si:H) thin films elaborated at low radiofrequency power and low hydrogen dilution. Structural properties of deposited films were investigated by Scanning Electron Microscopy (SE...
Article
Full-text available
ZnS1−xSex alloy nanostructures have been successfully synthesized through a simple and effective solvothermal method. Crystal structure, morphology, and optical properties of prepared nanopowders were characterized using X-ray diffraction (XRD), high resolution transmission electron microscopy, energy dispersive X-ray analysis, Field emission scann...
Chapter
Technological requirements to operate at increasingly smaller scales have brought nanoscience to develop chemical procedures that allow producing particles of subnanometric scale with well-controlled sizes. The properties of small nanoparticles (NPs) and large and small atomic quantum clusters (AQCs) are an illustration of how an incremental confin...
Article
Full-text available
Tin doped indium sulfide films were grown on glass substrates by spray pyrolysis technique at low different Sn:In atomic ratio in the starting solution and optimum experiment conditions (Ts = 340°C, S:In = 2). The tin to indium molar ratio Sn:In was varied from 0 to 4.10-3 in the solution. The obtained films with 2 μm of thickness, are perfectly ad...
Article
Full-text available
In this paper, novel magnetic silica nanocomposites were prepared by anchoring magnetite nanoparticles onto the outer surface of mesoporous SBA-15 silica; magnetic nanoparticles were prepared by microemulsion and solvothermal methods, varying the synthesis conditions in order to control the final physicochemical, textural and magnetic properties. T...
Article
Computer simulations were carried out to study the origin of the different metal segregation showed by bimetallic nanoparticles synthesized in microemulsions. Our hypothesis is that the kinetics of nanoparticle formation in microemulsions has to be considered on terms of two potentially limiting factors, chemical reaction itself and the rate of rea...
Article
Full-text available
An extremely simple, fast, cost-effective, transfer- and chemical-free, reliable and industrially scalable non-conventional rubbing method (substrates rubbing method) for obtaining high quality and large size mono- and few layer (MFL) graphene, hexagonal boron nitride (h-BN) and other two-dimensional (2D) material nanostripes (NSs) consisting of ar...
Article
Green synthesis of silver nanoparticle has been demonstrated using aqueous extract of the pericarp of Sapindus mukorossi fruit as a reducing agent as well as stabilizer. Reducing power of the extract has been evaluated by Cyclic Voltammetry (CV) experiment. The as-synthesized colloid is highly stable and particles remain disperse even after one yea...
Article
In this paper an easy method to prepare flexible conductive substrates has been demonstrated. The substrates are mainly PET (PolyEthyleneTerephthalate), on which AgNW (silver nanowire) are deposited by spin casting method. For adhesion purpose a common cosmetic material has been utilized. The material provides versatile features to these coated sub...
Article
Full-text available
A comparative study on different bimetallic nanocatalysts prepared from microemulsions using a one-pot method has been carried out. The analysis of experimental observations, complemented by simulation studies, provides detailed insight into the factors affecting nanoparticle architecture: (1) The metal segregation in a bimetallic nanocatalysts is...
Article
Understanding in vivo biodistribution of iron oxide nanoparticles (IONs), and the involvement of the phagocyte system in this process, is crucial for the assessment of their potential health risk. In the present study, the histochemical expression of iron in spleen and liver sections of CD-1 mice (aged 8 weeks) was quantified, 24 hours after intrav...
Article
Full-text available
Cu2SnS3 (CTS) nanocrystallites were successfully obtained through a facile solvothermal technique at 140 and 200 °C for 24 h. In this work, the effect of temperature on structural, morphological and optical characteristics was investigated. The X-ray diffraction patterns of the samples proved the polycrystalline nature and the formation of pure cub...
Article
Full-text available
Tin doped In2S3 film was grown by chemical spray pyrolysis (CSP) method using compressed air as a carrier gas. Structural, morphological, optical and electrical properties of film have been investigated. X-ray diffraction shows well crystallized film according to cubic -In2S3 phase. The FESEM photograph reveals that the film is dense without pinho...
Article
This work proposes a novel method to obtain catalytically active gold clusters by using the water-soluble 5,10,15,20-Tetrakis(4-trimethyl-ammonio-phenyl)porphyrin under mild conditions instead of using strong reducing agents. Uniform gold clusters were obtained with a diameter comprised between 1 and 2 nm and long-term stability. Furthermore, the w...
Article
Full-text available
In this study, tin doped indium sulfide thin films (In2S3:Sn) at different molar ratios of Sn:In (0-1 % by mol in solution) were deposited on glass substrates by chemical spray pyrolysis method. The films were investigated by X-ray diffraction, optical absorption, Raman and photoluminescence spectroscopies, field emission scanning electron microsco...
Article
Iron oxide nanoparticles (IONs) have physical and chemical properties that render them useful for several new biomedical applications. Still, so far, in vivo safety studies of IONs with coatings of biomedical interest are still scarce. The aim of this study, therefore, was to clarify the acute biological effects of polyacrylic acid (PAA)-coated ION...
Article
Gold nanorods have been succesfully synthesized by the seeds mediated method using Au clusters. This synthesis does not require silver ions to obtain large amounts of Au nanorods and have a good control over their aspect ratio. Au clusters are produced with the same recipe as for Au seeds, but using shorter reaction times. This very simple scheme c...
Article
Full-text available
In this work we report the synthesis, for the first time, of small, highly monodisperse Cu5 clusters in water without any surfactant or protective agent. For this purpose, we used a new approach based on the kinetic control of the reaction, which is achieved with an electrochemical method and using a solution with almost no conductivity (i.e. witho...
Article
In the present work we report the synthesis procedure of magnetic mesoporous SBA-15 silica materials with controlled morphology as potential composites for biomedical applications, mainly as scaffolds for bone tissue engineering. Different procedures and synthetic parameters are varied to control the physico-chemical, textural and magnetic properti...
Article
Full-text available
The factors that govern the reaction rate of Au/Pt bimetallic nanoparticles prepared in microemulsions by a one-pot method are examined in the light of a simulation model. Kinetic analysis proves that the intermicellar exchange has a strong effect on the reaction rates of the metal precursors. Relating to Au, reaction rate is controlled by the inte...
Article
Chitosan and gelatin are biodegradable and biocompatible polymers which may be used in the preparation of 3D scaffolds with applications in biomedicine. Chitosan/gelatin scaffolds crosslinked with glutaraldehyde were prepared by ice segregation induced self-assembly (ISISA); a unidirectional freezing at −196 °C followed freeze-drying to produce mac...
Article
Full-text available
Ability to control the metal arrangement in bimetallic nanocatalysts is the key to improving their catalytic activity. To investigate how metal distribution in nanostructures can be modified, we developed a computer simulation model on the synthesis of bimetallic nanoparticles obtained in microemulsions by a one-pot method. The calculations allow p...
Article
Subnanometric noble metal clusters, composed by only a few atoms, behave like molecular entities and display magnetic, luminescent and catalytic activities. However, non-covalent interactions of molecular metal clusters, lacking of any ligand or surfactant, have not been seen at work. Theoretically attractive and experimentally discernable, van der...
Article
The use of multifunctional nanoparticles (NPs), usually in the range of 3–100 nm, with their newly discovered properties – such as superparamagnetic (SPM) behaviour, enhancement of activity and selectivity in catalytic processes and localised surface plasmon resonance (LSPR) – offers new technical possibilities for biomedical applications such as m...
Article
Full-text available
Essential processes for living cells such as transcription and replication depend on the formation of specific protein-DNA recognition complexes. Proper formation of such complexes requires suitable fitting between the protein surface and the DNA surface. Adopting doxorubicin (DOX) as a model probe, we report here that Ag3 clusters (Ag-AQCs) inhibi...
Article
Full-text available
In 2 S 3 films have been grown on glass substrates by spray pyrolysis technique. The deposition was carried out in a 300–500 °C substrate temperature and the molar ratio S/In is fixed to 2. The characteristics of these films have been determined by X-ray diffraction, energy dis-persive spectroscopy, atomic force microscopy and spec-trophotometer. T...
Article
We present a theoretical model to predict the atomic structure of Au/Pt nanoparticles synthesized in microemulsions. Excellent concordance with the experimental results shows that the structure of the nanoparticles can be controlled at sub-nanometer resolution simply by changing only the concentration of the reactants. The results of this study not...
Article
We report the synthesis of copper nanoparticle using a completely green protocol. Aqueous copper sulphate solution was used as a precursor of copper nanoparticle whereas L-ascorbic acid and starch acted as reducing agent and stabilizer respectively. Formation of copper nanoparticle was confirmed by colour, UV-VIS spectroscopy and X-Ray Diffraction...
Article
Gold nanorods (GNRs) were initially prepared with 3 different aspect ratios (2.5, 2.9 and 3.8) via a seed-mediated chemical route, using cetyltrimethylammonium bromide (CTAB) as organic surfactant. These rods were then irradiated under continuous-wave (λ=1064 nm) and pulsed (λ=1064, 532, 355 nm) emission modes using Nd:YVO4 and Nd:YAG lasers, respe...
Article
Full-text available
Anisotropic gold nanostructures prepared by the seeds method in the presence of Ag ions have been used to study their photostability to low-power UV irradiation (254nm) at room temperature. It is observed that, whereas spheres are very stable to photoirradiaton, rods and prisms suffer from photocorrosion and finally dissolve completely with the pro...
Article
Subnanometric samples, containing exclusively Ag2 and Ag3 clusters, were synthesized for the first time by kinetic control using an electrochemical technique without the use of surfactants or capping agents. By combination of thermodynamic and kinetic measurements and theoretical calculations, we show herein that Ag3 clusters interact with DNA thro...
Article
Subnanometric samples, containing exclusively Ag2 and Ag3 clusters, were synthesized for the first time by kinetic control using an electrochemical technique without the use of surfactants or capping agents. By combination of thermodynamic and kinetic measurements and theoretical calculations, we show herein that Ag3 clusters interact with DNA thro...
Article
Full-text available
Tin-doped In2S3 films were grown by the chemical spray pyrolysis method using compressed air as a carrier gas. Tin is incorporated in the solution using SnCl4. Structural and optical properties of films were investigated by x-ray diffraction (XRD), absorption, Raman and photoluminescence spectroscopies. Field emission scanning electron microscopy (...
Article
Tin-doped In 2 S 3 films were grown by the chemical spray pyrolysis method using compressed air as a carrier gas. The films were annealed for 2 h at different temperatures (300, 400 and 500 °C) under nitrogen atmosphere. X-ray diffraction data show that In 2 S 3 :Sn films are polycrystalline with a cubic phase. The film grain size increases from 26...
Article
Full-text available
Tin-doped In 2 S 3 films were grown by the chemical spray pyrolysis method using compressed air as a carrier gas. The films were annealed for 2 h at different temperatures (300, 400 and 500 °C) under nitrogen atmosphere. X-ray diffraction data show that In 2 S 3 :Sn films are polycrystalline with a cubic phase. The film grain size increases from 26...
Article
This paper reports a novel procedure using nanosomes, made of bola-hydroxyl and mercapto-palmitic acids, for the production of gold clusters with robust luminescent emissions and very large Stokes shifts. It shows that these results cannot be explained by the currently accepted mechanism based on ligand-to-metal charge transfer absorptions involvin...
Article
Full-text available
Multifunctional sulfur-containing homo, block and random copolymers with a modulable number of noble metal affine groups were efficiently prepared by the atom transfer radical polymerization of S-(4-vinylbenzyl)thioacetate, in case with styrene. Their potential as model ligands for the stabilization of sub-5 nm noble metal nanoparticles is demonstr...
Article
Clusters are stable catalytic species, which are produced during the synthesis of nanoparticles (NPs). Their existence contradicts the thermodynamic principles used to explain the formation of NPs by the classical nucleation and growth theories (NGTs). Using chemical and electrochemical methods we will show that depending on the experimental condit...
Chapter
Small atomic clusters, with a few tens to a hundred of atoms, fill the gap between the atomic range and the nanoscale, completing the view of material systems up to the bulk scale. In this chapter, we provide an introduction to the novel structural and physicochemical properties that emerge in these small atomic clusters as a clear effect of the qu...
Article
Full-text available
Reducing the size from the bulk material to nanoparticles produces a scaling behavior in physical properties in the later ones, due to the large surface-to-volume fraction. By further size reduction, entering into the subnanometric cluster region, physical properties are largely affected by strong quantum confinement. These quantum size effects (HO...
Article
In this study we report on an assessment of the conservation condition of a sculpture partially made of synthetic polymers, and on the prediction of its long term durability. Compositional analysis, largely based on IR spectroscopy and Raman spectrometry, identified the epoxy vinyl ester resin used for modelling the lower part of the sculpture as t...
Article
Over the past decades, a great research interest has been focused on semiconductor (SC) photocatalysts, where TiO 2 (3.0 eV) received especially attention in spite of the UV irradiation necessary for its activation. Therefore, extending the photocatalytic activity to the visible light has been the subject of numerous studies, including TiO 2 doping...
Article
Full-text available
A new homogeneous assay for a fast, selective and sensitive detection and elimination of lead ions has been developed using copper clusters as novel fluorescent probes in aqueous solutions. At the same time, their elimination is achieved using the efficient photocatalytic activity of such clusters. Both effects are explained in terms of an efficien...
Article
Full-text available
The different distributions of metals in bimetallic nanoparticles synthesized in microemulsions were studied by computer simulation. The simulations demonstrated that if the difference between the reduction potentials of both metals is about 0.15-0.3 V, the compartmentalization of the reaction media causes the accumulation of slower reduction react...
Article
Iron oxide nanoparticles (ION) can have a wide scope of applications in biomedicine, namely in magnetic resonance imaging, tissue repair, drug delivery, hyperthermia, transfection, tissue soldering, and as antimicrobial agents. The safety of these nanoparticles, however, is not completely established, namely concerning their effect on immune system...
Article
Superparamagnetic nanocomposites were obtained by dispersion of oleic acid-coated magnetic ultrafine iron oxide nanoparticles (NPs) in poly(hydroxybutyrate) (PHB), a semicrystalline, biodegradable and biocompatible polymer. Film nanocomposites displayed an optically homogeneous structure formed by sub-micrometric clusters created by a strong NPs se...
Article
The inside cover picture shows the high versatility of reverse micelles as nanoreactors. The composition of the nonpolar organic medium has a huge effect on properties such as the interfacial micropolarity, the hydrogen-bonding ability, and the sequestrated water structure of sodium 1,4-bis(2-ethylhexyl)sulfosuccinate (AOT) reverse micelles (RMs)....
Article
Au clusters (25 atoms) are up to 180 times more active for the hydrogen oxidation reaction (HOR) than bulk Au. They were created from catalytically inactive Au clusters (2-5 atoms) by electrochemical activation in the presence of Au ions. The HOR activity depends on the cluster's size and it is related to the fact that the position of the LUMO is b...