M. Meléndez‐Lira
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View article: Modelado de confinamiento cuántico para nanocristales de semiconductores
Modelado de confinamiento cuántico para nanocristales de semiconductores Open
Este estudio presenta el modelado de nanocristales de silicio en una matriz de SiO2 para aplicaciones optoelectrónicas, destacando el confinamiento cuántico. Utilizando la teoría en la aproximación isotrópica, se analizan las propiedades e…
View article: Towards ZnO-Based Near-Infra-Red Radiation Detectors: Performance Improvement via Si Nanoclusters Embedment
Towards ZnO-Based Near-Infra-Red Radiation Detectors: Performance Improvement via Si Nanoclusters Embedment Open
Si nanoparticles embedded in a ZnO matrix were produced by a sequential deposition of ZnO/Si/ZnO layers, by radio frequency sputtering. Sample growth temperatures of 25 °C, 300 °C, and 500 °C were used to deposit ZnO/Si/ZnO layers on soda …
View article: Optoelectronic properties of BiCuOSe p-type oxychalcogenides
Optoelectronic properties of BiCuOSe p-type oxychalcogenides Open
BiCuOSe systems are proposed as candidates to develop transparent p-type semiconductors in the visible region. This work reports the characterization results obtained for the BiCuOSe powders, synthesized by the solid-state reaction (SSR) m…
View article: Bandgap variation in semiconductor thin films of the solid solution (CdTe)<sub>1-x</sub>(In<sub>2</sub>Te<sub>3</sub>)x deposited by RF sputtering
Bandgap variation in semiconductor thin films of the solid solution (CdTe)<sub>1-x</sub>(In<sub>2</sub>Te<sub>3</sub>)x deposited by RF sputtering Open
(CdTe) 1-x (In 2 Te 3 ) x films, with 0.1 ≤ x ≤ 1, were deposited by radio frequency sputtering on glass substrates employing different targets, prepared for each composition. The x-ray diffractograms were consistent with substitutional In…
View article: Optical and structural properties of Fe2O3-ZnO composite thick films obtained by ultrasonic spray pyrolysis
Optical and structural properties of Fe2O3-ZnO composite thick films obtained by ultrasonic spray pyrolysis Open
Fe2O3-ZnO composite gained attention due the several applications like that sensors, photocatalysis, reduction of mercury ions. Fe2O3-ZnO composite thick films were prepared by Ultrasonic Spray Pyrolysis on a glass substrate, using 0.1 M a…
View article: Bandgap Variation in Semiconductor Thin Films of (Cdte)1-X(In2te3)X Solid Solution Deposited by Rf Sputtering
Bandgap Variation in Semiconductor Thin Films of (Cdte)1-X(In2te3)X Solid Solution Deposited by Rf Sputtering Open
View article: The role of Zn-complexing agents in the chemical bath deposition of ZnO and ZnS thin films
The role of Zn-complexing agents in the chemical bath deposition of ZnO and ZnS thin films Open
In order to control the deposition of Zn-related films by chemical bath deposition, the effects of Zn-complexing agent are analyzed. ZnS films were produced by chemical bath deposition technique employing sodium citrate, ethanolamine and T…
View article: Is sulfur the responsible for color of yellow Chiapas Amber?
Is sulfur the responsible for color of yellow Chiapas Amber? Open
Amber is a fossilized natural resin found in specific areas of the world; its geographical origin is associated to a characteristic color. Amber all over the world share basic characteristics due to a common polymeric matrix; however, its …
View article: Local hardening of Raman phonons in Ba<sub>x</sub>Sr<sub>1−x</sub>TiO<sub>3</sub> thin films deposited by r.f. sputtering
Local hardening of Raman phonons in Ba<sub>x</sub>Sr<sub>1−x</sub>TiO<sub>3</sub> thin films deposited by r.f. sputtering Open
Thin films of nanometric order of a solid solution of barium-strontium titanate Ba x Sr 1− x TiO 3 (BSTO), in the entire 0 ≤ x ≤ 1 range, were deposited at 495 °C on quartz by RF reactive co-sputtering. The composition was controlled throu…
View article: Study of the Effect of TiO<sub>2</sub> Layer on the Adsorption and Photocatalytic Activity of TiO<sub>2</sub>-MoS<sub>2</sub> Heterostructures under Visible-Infrared Light
Study of the Effect of TiO<sub>2</sub> Layer on the Adsorption and Photocatalytic Activity of TiO<sub>2</sub>-MoS<sub>2</sub> Heterostructures under Visible-Infrared Light Open
In the last decade, the urgent need to environmental protection has promoted the development of new materials with potential applications to remediate air and polluted water. In this work, the effect of the TiO 2 thin layer over MoS 2 mate…
View article: Effect of laser fluence on structural and optical properties of Cu<sub>x</sub>S films grown by pulsed laser deposition at different wavelengths
Effect of laser fluence on structural and optical properties of Cu<sub>x</sub>S films grown by pulsed laser deposition at different wavelengths Open
Cu x S thin films were grown onto soda-lime glass substrates by pulsed laser deposition at two different wavelengths: 1064 and 532 nm. X-ray diffraction, Raman and UV–vis spectroscopies were used to characterize the Cu x S films. Results a…
View article: Modification of the Crystalline Structure of ZnO Nanoparticles Embedded Within a SiO2 Matrix due to Thermal Stress Effects
Modification of the Crystalline Structure of ZnO Nanoparticles Embedded Within a SiO2 Matrix due to Thermal Stress Effects Open
Self-assembled nanocrystals of ZnO were embedded within a SiO2 matrix by a sequential deposit using reactive R.F. sputtering. The ZnO nanoparticles (NP’s) were obtained by depositing a very thin layer (~20 nm) of Zn on the bottom of the va…
View article: Modification of the Crystalline Structure of ZnO Nanoparticles Embedded Within a SiO2 Matrix due to Thermal Stress Effects
Modification of the Crystalline Structure of ZnO Nanoparticles Embedded Within a SiO2 Matrix due to Thermal Stress Effects Open
Self-assembled nanocrystals of ZnO were embedded within a SiO2 matrix by a sequential deposit using reactive R.F. sputtering. The ZnO nanoparticles (NP’s) were obtained by depositing a very thin layer (~20 nm) of Zn on the bottom of the va…
View article: Temperature–Power Simultaneous Effect on Physical Properties of BaxSr1−x TiO3 Thin Films Deposited by RF–Magnetron Cosputtering for 0 ≤ x ≤1
Temperature–Power Simultaneous Effect on Physical Properties of BaxSr1−x TiO3 Thin Films Deposited by RF–Magnetron Cosputtering for 0 ≤ x ≤1 Open
The combined effect on the variation of the in-situ deposition temperature and the variation of the applied power on the deposition rate (DR), gap energy (Eg), and resistivity (ρ) in barium strontium titanate thin films, deposited into RF …
View article: Bipolar resistive switching on Ti/TiO2/NiCr memory cells
Bipolar resistive switching on Ti/TiO2/NiCr memory cells Open
We investigated the electric-field-induced resistance-switching behavior of metal-insulator-metal (MIM) cells based on TiO2 thin films fabricated by the reactive RF-sputtering technique. MIM cells were constructed by sandwiched TiO2 thin f…
View article: Bipolar resistive switching on Ti/TiO2/NiCr memory cells
Bipolar resistive switching on Ti/TiO2/NiCr memory cells Open
We investigated the electric-field-induced resistance-switching behavior of metal-insulator-metal (MIM) cells based on TiO 2 thin films fabricated by the reactive RF-sputtering technique. MIM cells were constructed by sandwiched TiO 2 th…
View article: Set-Up Method on Properties of Ba<sub>X</sub>Sr<sub>1-X</sub>TiO<sub>3</sub> Thin Films Deposited by RF-Magnetron Co-Sputtering by Projecting Temperature and Stoichiometric Effect
Set-Up Method on Properties of Ba<sub>X</sub>Sr<sub>1-X</sub>TiO<sub>3</sub> Thin Films Deposited by RF-Magnetron Co-Sputtering by Projecting Temperature and Stoichiometric Effect Open
Thin films (100-400 nm) of BaxSr1-xTiO3 (0≤x≤1) deposited in RF-magnetron co-sputtering equipment are presented in this research work. The change of deposition rate, gap energy, and resistivity as a function of temperature- applied p…
View article: Structural and vibrational studies on composites polymer electrolytes (PEO)10CF3COONa + x wt.% Al2O3
Structural and vibrational studies on composites polymer electrolytes (PEO)10CF3COONa + x wt.% Al2O3 Open
"Composites formed by combinations of polyethylene oxide (PEO) and sodium trifluoroacetate (CF3COONa) with different aluminum oxide (Al2O3) concentrations were synthetized. Infrared (IR), Raman spectroscopy, X ray diffraction (XRD) and ato…
View article: Stoichiometry Calculation in Ba<sub><i>x</i></sub>Sr<sub>1−<i>x</i></sub>TiO<sub>3</sub> Solid Solution Thin Films, Prepared by RF Cosputtering, Using X-Ray Diffraction Peak Positions and Boltzmann Sigmoidal Modelling
Stoichiometry Calculation in Ba<sub><i>x</i></sub>Sr<sub>1−<i>x</i></sub>TiO<sub>3</sub> Solid Solution Thin Films, Prepared by RF Cosputtering, Using X-Ray Diffraction Peak Positions and Boltzmann Sigmoidal Modelling Open
A novel procedure based on the use of the Boltzmann equation to model the parameter, the film deposition rate, and the optical band gap of Ba x Sr 1− x TiO 3 thin films is proposed. The Ba x Sr 1− x TiO 3 films were prepared by RF cosputt…
View article: Boride coating on the surface of WC–Co-based cemented carbide
Boride coating on the surface of WC–Co-based cemented carbide Open
In this study, the structural properties and enhancement in the hardness of commercial WC–Co-based cemented carbide inserts are reported after the formation of a boronised layer on the surface. A boronising thermochemical treatment was giv…
View article: Facile Synthesis of SrCO3-Sr(OH)2/PPy Nanocomposite with Enhanced Photocatalytic Activity under Visible Light
Facile Synthesis of SrCO3-Sr(OH)2/PPy Nanocomposite with Enhanced Photocatalytic Activity under Visible Light Open
Pyrrole monomer was chemically polymerized onto SrCO3-Sr(OH)2 powders to obtain SrCO3-Sr(OH)2/polypyrrole nanocomposite to be used as a candidate for photocatalytic degradation of methylene blue dye (MB). The material was characterized by …
View article: Properties of Particle Size Distribution from Milled White Nixtamalized Corn Kernels as a Function of Steeping Time
Properties of Particle Size Distribution from Milled White Nixtamalized Corn Kernels as a Function of Steeping Time Open
This paper focuses on the particle size distribution (PSD) changes during nixtamalized corn kernels (NCK) as a function of the steeping time (ST). The process to obtain powder or corn flour from NCK was as follows: (i) the NCK with differe…
View article: Synthesis of self-assembled Ge nanocrystals employing reactive RF sputtering
Synthesis of self-assembled Ge nanocrystals employing reactive RF sputtering Open
"This work presents the results of a simple methodology able to control crystal size, dispersion and spatial distribution of germanium nanocrys- tals (Ge-NCs). It takes advantage of a self-assembled process taken place during the deposit o…
View article: Growth of TiO2 films by pulsed electrodeposition: Influence from frequency of voltage pulses
Growth of TiO2 films by pulsed electrodeposition: Influence from frequency of voltage pulses Open
TiO2 films were grown by pulsed electrodeposition on stainless steel substrates, and they were studied the influence of the frequency of the voltage pulse on the amount of mass deposited and the morphology of the samples. The electrolytic …
View article: Synthesis of CdS Nanocrystals by Employing the By‐Products of the Anaerobic Respiratory Process of <i>Desulfovibrio alaskensis</i> 6SR Bacteria
Synthesis of CdS Nanocrystals by Employing the By‐Products of the Anaerobic Respiratory Process of <i>Desulfovibrio alaskensis</i> 6SR Bacteria Open
A novel methodology for the direct synthesis of CdS nanoparticles, using a biological agent that avoids the extracellular processing, and the results of the characterization of CdS nanocrystals are presented. The by‐products of the anaerob…