Carlos Vázquez-Vázquez

Carlos Vázquez-Vázquez
University of Santiago de Compostela | USC · Department of Physical Chemistry

Doctor of Chemistry

About

117
Publications
16,631
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
2,808
Citations
Introduction
Carlos Vázquez-Vázquez currently works at the Department of Physical Chemistry, Universidade de Santiago de Compostela. He does research in Nanotechnology, Materials Chemistry and Physical Chemistry. Current research main interest is in metallic and semiconducting materials for environmental and energy applications.

Publications

Publications (117)
Article
Full-text available
Copper sulfide (CuS2) has been prepared by spray pyrolysis process. Structural and morphological properties of prepared sample were investigated by XRD and AFM. The X-ray diffraction showed that the structure of this film is cubic. The film surface was homogenous and dense. The UV absorbance and reflectance spectra show a high absorbance with gap e...
Article
Senescent cells accumulation can contribute to the development of several age-related diseases, including cancer. Targeting and eliminating senescence cells, would allow the development of new therapeutic approaches for the treatment of different diseases. The 4N1Ks peptide, a 10 amino acid peptide derived from TSP1 protein, combines both features...
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
Silicon carbide (SiCcs and SiCdk) powders have been prepared from Murzuq silica sand (fine silica) as a silica source(Mws), citrus Sinensis tree branches (cs), and dates kernels (dk) taken as carbon sources for industrial applications. The sol–gel method was employed to prepare the samples. The samples were calcinated in a bath containing silica/ca...
Article
Full-text available
In recent years, the application of magnetic nanoparticles as alternative catalysts to conventional Fenton processes has been investigated for the removal of emerging pollutants in wastewater. While this type of catalyst reduces the release of iron hydroxides with the treated effluent, it also presents certain disadvantages, such as slower reaction...
Article
The silicon carbide (SiC) powders were prepared from four types of silica sands as a silica source. These were collected from Alhasawneh Mountain, Muruq city, Sebha city and Zalaf region located in the southern of Libya. Here, the carbon source was orange tree branches and the sol-gel method was used for preparing the samples. The calcination proce...
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
Indium sulfide thin films with different amounts of silver doping were deposited by spray pyrolysis. The samples were tested as potential photocatalysts by degrading methylene blue (MB) dye aqueous solution under the effect of light. Samples were prepared using precursors with Ag/In ratios of 0 at.%, 4 at.%, and 6 at.%, corresponding to a measured...
Article
Full-text available
Today, the presence of recalcitrant pollutants in wastewater, such as pharmaceuticals or other organic compounds, is one of the main obstacles to the widespread implementation of water reuse. In this context, the development of innovative processes for their removal becomes necessary to guarantee effluent quality. This work presents the potentialit...
Article
Full-text available
The potential of nanoemulsions for the oral administration of peptides is still in its early stage. The aim of the present work was to rationally design, develop, and fully characterize a new nanoemulsion (NE) intended for the oral administration of hydrophobically modified insulin (HM-insulin). Specific components of the NE were selected based on...
Article
Full-text available
A set of silver-doped indium sulphide (In2S3:Ag) thin films were deposited by spray pyrolysis technique, at 350 °C, to analyze the effects of the Ag doping on the physical properties of the films. Within the limits of the analyzed dopant concentration, X-ray diffraction (XRD) revealed the polycrystalline nature of the films, crystalizing in the β-I...
Article
Indium sulfide thin film has been deposited by spray pyrolysis technique at 340 °C. Structural analysis by XRD and Raman analysis confirm that this sample is polycrystalline, belongs to the β cubic phase and has no secondary phases. The crystallite size is around 32 nm. Morphological study shows that the surface is entirely protected with grains of...
Article
The pressure on natural water resources associated with increasing water scarcity highlights the value of using reclaimed water through the development of efficient and environmentally friendly treatment technologies. In this work, the use of magnetic nanoparticles in photo-Fenton catalysis for water disinfection was considered to inactivate natura...
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...
Article
Full-text available
This work reports the thickness effect on the sensing performances of In2S3 material for some Volatile Organic Compounds (VOCs). In2S3 films were deposited on glass substrates by the spray pyrolysis technique. Different samples were prepared via changing the spray time in the range of 10–90 min. The film thickness varies from 0.8 μm to 6.1 μm. The...
Article
Metal sulfides have been studied for their high performances as new sensitive materials for gas detection. CdS has been used recently in view of its high degree of selectivity and sensitivity to NO2. The objective of this work is to replace Cadmium with Indium, which can be a good alternative in order to avoid the toxicity of cadmium. Thus, this wo...
Article
Full-text available
The annealing temperature (Ta) dependence of the structural, morphological, electrical and dielectric properties of ZnS thin films was investigated. In this work, we consider the as-deposited and annealed ZnS thin films at different temperatures. The as-deposited films were amorphous in nature. However, the films annealed at Ta ≥ 673 K, exhibited a...
Article
Full-text available
Emerging contaminants (ECs) represent a wide range of compounds, whose complete elimination from wastewaters by conventional methods is not always guaranteed, posing human and environmental risks. Advanced oxidation processes (AOPs), based on the generation of highly oxidizing species, lead to the degradation of these ECs. In this context, TiO 2 an...
Article
Full-text available
This study provides an overview of the environmental impacts associated with the production of different magnetic nanoparticles (NPs) based on magnetite (Fe 3 O 4), with a potential use as heterogeneous Fenton or photo-Fenton catalysts in wastewater treatment applications. The tendency of Fe 3 O 4 NPs to form aggregates in water makes necessary the...
Article
Full-text available
This paper reports the effect of the substrate temperature of sprayed In2S3 material on the sensing response to ethanol. Glass substrates have been the supports of In2S3 thin films elaborated by spray pyrolysis technique. The growth has been made at a substrate temperature in the range 300–500 °C and the S/In molar ratio was set to 2. The morpholog...
Article
Full-text available
The zinc oxide (ZnO) nanopowders were prepared by the sol gel method. The calcination process to calcine the samples was executed at different temperature values of 600° C and 700° C . The structures and morphology of samples were characterized using the X ray diffractometer (XRD), Raman and the scanni ng electron microscope (SEM). An amorphous str...
Article
Tin-doped indium sulfide (In2S3:Sn) thin films were deposited on the glass substrate by varying molar ratio of Sn:In from 0 to 4% using spray pyrolysis. X-ray diffraction analysis showed that the deposited films were polycrystalline and crystallized in a cubic structure. The evaluated crystallite size varied in the range, 14.8–25.5 nm. The root-mea...
Article
Full-text available
The development of scaffolds with suitable physicochemical and mechanical properties allowing for the structural regeneration of injured bone and recovery of the natural biological functionality is still a challenge in the tissue engineering field. Nanostructured materials with added theranostic abilities, together with an interconnected hierarchy...
Article
Full-text available
Indium sulfide thin films were deposited on preheated soda-lime glass substrates using spray technique over experiment optimum conditions (Ts = 340 °C, S/In = 2). The effect of annealing time on structural, morphological, optical and electrical properties of the films was investigated. X-ray diffraction spectra show that In2S3 films are polycrystal...
Article
Full-text available
With the recent development of nanotechnology, magnetic nanoparticles (mNPs) have received increasing attention as potential heterogeneous Fenton catalysts in wastewater treatment applications, as an alternative to the conventional Fenton process using dissolved iron salts. Due to their superparamagnetic properties, Fe3O4 mNPs can be easily recover...
Article
In this research, a new sequential batch reactor (SBR) coupled to an internal magnetic separator was developed. The separator consists of a set of axially magnetized permanent toroidal magnets, distributed along a non-magnetic steel rod, uniformly spaced with alternate polarity, which provide an external magnetic field of up to 1.2 T. The feasibili...
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...
Article
The development of nanotechnology has provided a range of diverse nanoscale carriers that can be potentially applied for enzyme immobilization. Among the different types of support, magnetic nanoparticles (mNPs) have received increasing attention because they can be easily recovered from the reaction medium by applying an external magnetic field. I...
Conference Paper
Full-text available
Tin doped In2S3 films have been prepared by the spray pyrolysis (CSP) technique on glass substrates at 350 °C. The Sn doping level was changed with Sn:In (0-2 % in solution). The structural studies reveal that the deposited films are polycrystalline in nature exhibiting cubic structure. The crystallite size decreases from 23.3 to 21 nm and RMS roug...
Article
Binding constants, Log K ≈ 6.6 M-1, and NMR characterization of the complexes formed by sulfobetaines and cucurbit[7]uril (CB7) support the electrostatic interaction as major driving force. This very strong binding motif is cross-linked by additional CB7 molecules resulting in the formation of supramolecular nanoparticles (SNPs) with an average dia...
Article
Full-text available
In this work, nickel (Ni) doped indium sulfide (In2S3) films have been prepared by the spray pyrolysis (CSP) technique on glass substrates at 350 °C. The Ni doping level was changed with Ni:In (0, 2 and 4 % in solution). The structural studies reveal that the deposited films are polycrystalline in nature exhibiting cubic structure. The crystallite...
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
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
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
High yield of vitamin B3 is produced using Ag/ZnO/graphene nanocomposite (1 wt%) as a nanocatalyst after its activation by a silicon precursor such as trimethylsilyl chloride(TMSCl) or tert-butyldimethylsilyl chloride (TBSCl) under visible light. TBSCl has been proved as more efficient activating agent than TMSCl in the oxidation of heterocyclic al...
Article
Full-text available
Nanotechnology is the manufacture and use of functional structures that have at least one characteristic dimension measured in nanometers. Among the wide range of applications nanoparticles (NPs) may present, they can be used as a catalyst or as carrier to immobilize biological catalysts, such as enzymes. The use of magnetic nanoparticles (mNPs) pr...
Poster
Nanomaterials are defined as materials with at least one characteristic dimension in the range of 1 and 100 nm. Engineered Nanomaterials differ from bulk materials in two main characteristics: relative surface area and quantum effects. Between the different ENMs, magnetic nanoparticles (mNPs) have received special attention because of their potenti...
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
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
In this paper, spherical [email protected] (multi-Fe3O4@C) magnetic beads (DMB∼ 100 nm), composed of several single cores of magnetite nanoparticles (MNPs) (Dsingle-core ∼ 15 nm) surrounded by a wide carbon shell (δ ∼ 20 nm), have been synthesized by a solvothermal procedure in organic solvent that provides good control over size, shape, and crysta...
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
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
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
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 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
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
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...