William Chamorro

Chronic neuroinflammation is characterized by increased blood-brain barrier (BBB) permeability, leading to molecular changes in the central nervous system that can be explored with biomarkers of active neuroinflammatory processes. Magnetic resonance imaging (MRI) has contributed to detecting lesions and permeability of the BBB. Ultra-small superpar...

Platinum (Pt), platinum-bismuth (PtBi), platinum-copper (PtCu) and platinum-bismuth-copper (PtCuBi) clusters were grown in a gas aggregation source (GAS) equipped with three in-plane plasma magnetrons located in a single region of gas aggregation zone. X-ray diffraction results have shown that PtCu clusters form alloys as the decrease of the lattic...

Palladium clusters are grown using a gas aggregation source coupled to magnetron sputtering with oxygen as reactive gas. Clusters with a mean size between 2.6 and 3.3 nm are obtained. Oxygen enhances the deposition rate by a factor 3 (from 4 to 11 mg/h cm ⁻²) at the expense of the formation of larger clusters and the modification of the cluster com...

Molecular dynamics simulations are carried out for describing growth of Pd and PdO nanoclusters using the ReaxFF force field. The resulting nanocluster structures are successfully compared to those of nanoclusters experimentally grown in a gas aggregation source. The PdO structure is quasi-crystalline as revealed by high resolution transmission mic...

Nanocomposite films consisting of gold nanoparticles embedded in zinc oxide (ZnO-Au) have been synthesized with different gold loadings by reactive magnetron sputtering at near-room temperature followed by ex-situ annealing in air up to 300°C. Using X-ray diffraction and high resolution transmission microscopy it is shown that during deposition gol...

We review our recent findings that reactive magnetron sputtering can be operated without thermal assistance to produce epitaxial ZnO films and highly conductive and transparent aluminum-doped ZnO (AZO) films on large surface area. The growth of epitaxial films requires working in direct current (DC) mode at large oxygen partial pressure but high po...

In this work, ZnS:Cu thin films were synthetized by RF magnetron co-sputtering using ceramic ZnS and metallic Cu targets. The power applied to Cu target was changed to vary the Cu content in the films while other experimental parameters remain constant. Whatever the copper content, only the hexagonal ZnS phase was detected by X-ray diffraction and...

We present the growth of In2S3 onto Cu3BiS3 layers and soda-lime glass (SLG) substrates by using chemical bath deposition (CBD) and physical co-evaporation. The results reveal that the microstructure and the optical properties of the In2S3 films are highly dependent on the growth method. X-ray diffractrograms show that In2S3 films have a higher cry...

We present the growth of In 2 S 3 onto Cu 3 BiS 3 layers and soda-lime glass (SLG) substrates by using chemical bath deposition (CBD) and physical co-evaporation. The results reveal that the microstructure and the optical properties of the In 2 S 3 films are highly dependent on the growth method. X-ray diffractrograms show that In 2 S 3 films have...

Composite materials can exhibit properties that none of the individual components show. Moreover, composites at the nanoscale can present new properties compared to the bulk state or to macro-composites due to confinement and quantum size effects. The semiconductor/metal nanocomposites are highly interesting due to their unique catalytic and optoel...

Composite materials can exhibit properties that none of the individual components show. Moreover, composites at the nanoscale can present new properties compared to the bulk state or to macro-composites due to confinement and quantum size effects. The semiconductor/metal nanocomposites are highly interesting due to their unique catalytic and optoel...

new effective medium theory is introduced to describe the optical properties of a two-dimensional array of metallic nanoislands. This model which takes into account both the nanoisland orientation and their shape distribution is successfully used to interpret the ellipsometric measurements performed on gold nanoislands sputtered on a silicon substr...

span style="font-family: LMRoman9-Regular; font-size: xx-small;"> Películas delgadas de ZnS fueron sintetizadas por el método CBD (Chemical bath deposition) usando una solución constituida por tiourea y acetato de zinc como fuentes de S y Zn y citrato de amonio como agente acomplejante. Estas fueron crecidas sobre sustratos de vidrio soda lime rec...

Single-domain epitaxial ZnO films are grown near-room temperature (below 40 °C) on (0 0 0 1)-sapphire using reactive magnetron sputtering of a zinc target in the transition between the metallic and compound sputtering regimes. As the oxygen content in the reactive gas mixture is increased, the in-plane six-fold symmetry of hexagonal wurtzite ZnO, p...

Resumen La búsqueda de fuentes de energía alternativas a los combus-tibles fósiles ha permitido el desarrollo y uso de diferentes tecnologías basadas en el uso de la energía solar. Las celdas solares basadas en compuestos organicos ofrecen grandes ventajas en aspectos económicos, ambientales y tecnológicos y es por eso que la evolución que ha tenid...

ZnS thin films were deposited by CBD (chemical bath deposition) method using a solution containing thiourea and zinc acetate as sources of S and Zn and ammonium citrate as complexing agent. The samples were grown on soda lime glass substrates covered with a Cu2SnZnS4 (CZTS) thin film. Through an extensive parameter study carried out varying the mai...

This study evaluates the effect of annealing on optical, structural, and morphological properties of poly (3-hexiltiofeno) (P3HT), methyl ester of phenyl-C61-butyric acid (PCBM), and (P3HT: PCBM) blend thin films grown on alkaline glass substrates by spin coating, varying temperature between 80 to 120 °C and the annealing time between 0 and 45 minu...

CuInS 2 films have been prepared by two-step process 1) Cyclic voltammetry electrodeposition of Copper and Indium layers on soda-lime glass covered of ITO and FTO, and 2) Sulfur evaporation in a high vacuum reactor. The bimetallic thin films with Cu/In = 0,98 and Cu/In = 0,49 molar ratios were annealed in a sulfur atmosphere at 300 ºC for 90 min to...

Recently, the compound semiconductor Cu(3)BiS(3) has been demonstrated to have a band gap of ~1.4 eV, well suited for photovoltaic energy harvesting. The preparation of polycrystalline thin films was successfully realized and now the junction formation to the n-type window needs to be developed. We present an investigation of the Cu(3)BiS(3) absorb...

Recibido 17.03.10; Aceptado 24.02.11; Publicado en línea 24.04.11. Resumen Este trabajo presenta resultados de un estudio realizado sobre el efecto de los parámetros de síntesis sobre la cinética de crecimiento y sobre las propiedades morfológicas de películas delgadas de ZnS depositadas por el método CBD (chemical bath deposition) sobre películas...