Antonio Jiménez González

Antonio Jiménez González
Universidad Nacional Autónoma de México | UNAM · Departamento de Materiales Solares

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37
Publications
3,191
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1,146
Citations
Citations since 2016
6 Research Items
399 Citations
20162017201820192020202120220102030405060
20162017201820192020202120220102030405060
20162017201820192020202120220102030405060
20162017201820192020202120220102030405060

Publications

Publications (37)
Article
Full-text available
This study examined the synthesis of the n -type nanostructured titanium dioxide semiconductor using a combined sol-gel/solvothermal method at 200°C, varying the concentrations of H 2 O and HCl used as a catalyst for the hydrolysis of the titanium isopropoxide precursor. A white powder of TiO 2 nanoparticles was obtained via the solvothermal proces...
Article
Full-text available
A dye-sensitized solar cell (DSSC) is a photovoltaic device capable of generating electrical power from the absorption of solar radiation. These cells use a SnO 2 : F/TiO 2 /dye heterojunction as the active electrode (working electrode). Active electrodes containing TiO 2 in the anatase crystalline phase and synthetic dyes are used to achieve high...
Article
Full-text available
Undoped zinc oxide (ZnO) and fluorine doped zinc oxide (ZnO:F) thin films were deposited on sodalime glass substrates by the ultrasonic chemical spray technique. The effect of the relevant deposition variables, namely, doping concentration, solvent proportions and solution aging on the Haacke´s Figure of Merit, φM, of ZnO:F thin films, is reported...
Article
TiO2 and iron-doped TiO2 microsized powder is prepared by sol–gel method combined with hydrothermal treatment as an alternative to obtain high specific area under controlled conditions. Synthesis parameters such as temperature of hydrothermal treatment (125 °C–210 °C), calcination temperature (500 °C–900 °C), and calcination time (1 h–9 h) along wi...
Article
A multiscale model is presented to describe the radiation absorption field in photocatalytic reactors with supported catalyst. The characteristic matrix method is applied at the photocatalyst layer scale, and is embedded within a Monte Carlo ray tracing method, applied at the photoreactor scale. This approach allows to account for important design...
Article
In this work, we report the effect of deposition time on the physical properties such as structural, morphological, optical and electrical properties of aluminum and indium co-doped ZnO (AIZO) thin films. AIZO films were deposited by ultrasonic spray pyrolysis technique on glass substrates at different deposition times (10, 12 and 15 min) using bal...
Article
Full-text available
Anatase nanoparticles were synthesized from a titanium isopropoxide solution using a hydrothermal process at different pressures in an autoclave system while keeping the volume of the solution constant. As the autoclave pressure was increased from 1 to 71 atm (23 to 210 °C), the crystal size in the nanoparticles increased from 9 to 13.8 nm. The ana...
Article
Photodegradation studies of carbaryl pesticides were performed as a function of solar concentration using newly designed CPC collectors with different geometric solar concentration ratios. Design of a Multiple Compound Parabolic Concentrator, or MCPC, was performed by taking into account both that photocatalytic degradation efficiency is a function...
Article
The tungsten trioxide (WO3) is a promising material with important technologic and scientific applications, due to its electrochromic, gasochromic and photochromic properties. Usually, this material is synthesized following several routes, for example, sputtering, chemical deposition, sol-gel, hydrothermal, among others. However, these methods are...
Article
An analog electrical technique is presented to measure a small current that is generated by a thermionic converter when it is operated at low temperature regime. Direct and inverse currents are generated simultaneously in a thermionic converter at steady state (emitter temperature > 1500K); although, at low temperature regime any of them may be mor...
Article
An analog electrical technique is presented to measure a small current that is generated by a thermionic converter when it is operated at low temperature regime. Direct and inverse currents are generated simultaneously in a thermionic converter at steady state (emitter temperature > 1500K); although, at low temperature regime any of them may be mor...
Article
Atrazine is a highly persistent and carcinogenic compound used as herbicide around the world. This compound has been banned in USA and some European countries but in Mexico it is still widely used in the agriculture. In order to achieve a high mineralization of atrazine, present as active compound in the Gesaprim commercial herbicide, detoxificatio...
Article
Artificial neural networks (ANN) were proposed as a multivariate experimental design tool for monitoring a photo‐Fenton treatment of wastewaters containing a synthetic mixture of pesticides. ANN and Nelder‐Mead simplex methods were used to find out the optimum operating parameters of a photo‐Fenton pilot plant. ANN was developed to predict the most...
Article
The design of solar photocatalytic reactors is aimed at making the best use of the available solar radiation. This contribution addresses the development and modeling of solar photocatalytic reactors. Particular emphasis is placed on the work carried out by our research group and on recent contributions by researchers at other institutions. Due to...
Article
TiO2 is a versatile material that makes for fascinating study in any of its several physical forms: monocrystal, polycrystal, powder or thin film. Its enhanced photosensitivity to UV radiation and excellent chemical stability in acidic and aqueous media point to its excellent potential for use in a variety of applications, such as solar cells, elec...
Article
Mexico is located in the Earth’s sunbelt, where solar energy is plentiful for potential applications of solar energy conversion systems. According to several estimations (Renn� et al. 2000), the average insolation over the country’s surface amounts to 5 kWh/day, which puts Mexico in a privileged situation for the deployment of solar energy technolo...
Chapter
The generation of electric power for supplying the populations of large cities is effected at an elevated cost, given that this cost does not include solely the price of generating the electric power itself, i.e., production, storage, labor, maintenance of installations, distribution, etc., but, in addition, bears the associated costs of damage to...
Article
Photocatalytic degradation of water pollutants using TiO2 and solar light has been proposed as an effective alternative of treatment. Usually, TiO2 as a finely divided powder is added to polluted water forming a suspension, which is then irradiated under sunlight to conduct photochemical reactions. Although the literature frequently points out the...
Article
Photocatalytic degradation of the pesticide Aldrin dissolved in water was carried out, in one case, using concentrated solar radiation and, in another case, using non-concentrated solar radiation. In these experiments, the effects of catalyst concentration, oxidant agent concentration, and solar irradiation were tested. In experiments without irrad...
Article
An electrical circuit model which accounts for the internal electrical characteristics of a real vacuum thermionic converter (VTC) is presented. Using this model, the expected theoretical behavior of the VTC was determined in its equilibrium state. Besides this, its dynamic behavior was found when the VTC was operated under transient conditions. It...
Article
An attempt to identify intermediate and final products of photocatalytic degradation of sodium dodecylbenzensulfonate (DBSNa) in aqueous solution was carried out. Synthetic samples of DBSNa containing TiO2 as catalyst were treated in a solar concentrator device. Samples were taken at regular intervals and analyzed by GC/MS. Two main types of signal...
Article
Indium thin film (∼20nm) deposited on intrinsic lead sulfide films leads to the formation of an n-type composite layer when annealed in nitrogen atmosphere at 350–400°C. The formation of metallic lead and indium oxide is observed in the X-ray diffraction patterns of the films. The dark conductivity of the PbS+In films after nitrogen annealing at 40...
Article
By combining the electrochemical and sol-gel deposition methods it was possible to prepare the heterojunction NiOx/SnO2:F. High quality SnO2:F thin films were prepared by the sol-gel technique on glass substrates. These films are very transparent in the visible region, with optical transmittance >85%, and have conductivity around 230 Ω-1 cm-1. By u...
Article
This paper reports experimental results on photocatalytic degradation of sodium dodecylbenzene sulfonate (DBSNa), using the solar energy concentrator for photocatalysis studies (SECPS). The SECPS operation is based on the concentration of ultraviolet solar radiation on a reactor that contains contaminated water and a catalyst where the photocatalyt...
Article
Pure and aluminum-doped ZnO thin films of high quality were prepared by the solgel deposition method. ZnO thin films are formed by a three-step decomposition of the chemical complex (Zn(CH3COO)2·2H2O) to ZnO. The aluminum doping was achieved by the addition of AlCl3·2H2O and Al(NO3)3·9H2O in the methanol solution of the chemical complex at an atomi...
Article
Intrinsic bismuth sulfide deposited on indium thin films (∼20 nm) change ton-type when annealed in air or nitrogen atmosphere. Asdepositedbismuth sulfide on the In films is amorphous and electrically very resistive. Annealing the films in air at 200, 300, and 400°C results in the formation of In2O3as observed in the X-ray diffraction patterns of th...
Article
Polycrystalline ZnO:Al thin films have been prepared by the (Sol–gel) chemical deposition method. The ZnO:Al thin films are very transparent (∼90%) in the near UV, VIS and IR regions. The films are oriented along the c-axis ([002] direction) in the hexagonal structure. It is known that pure ZnO thin films are not chemically stable in corrosive medi...
Article
With the propose of investigating the effect of transition elements in ZnO thin films prepared by the Successive Ion Layer Adsorption and Reaction (SILAR) technique, the deposition solutions were chemically impurified with Ni, Cu, and Cd, as elements of the Ib, IIb, and VIIIa groups. X-ray fluorescence (XRF) analyses confirm that the impurification...
Article
ZnO thin films prepared by the chemical deposition technique, SILAR (successive ion layer adsorption and reaction) exhibit zincite (hexagonal) structure, are transparent in the visible and infrared region (∼ 90% optical transmittance), and photoconductive. Heat treatments significantly modify the stoichiometry and crystal structure of as-prepared Z...
Article
The use of well defined γ‐Al2O3 thin films enables the use of the surface sensitive ultraviolet photoelectron spectroscopy (UPS) for an absolute determination of the work function Φ. Thereby, the changes in the surface potential V s and dipole moment χ are determined also. We find these values to change characteristic upon variation of annealing te...
Article
The electronic structure and surface properties of γ-Al2O3 thin films are studied. We have prepared the films by oxydizing Al foils under controlled conditions and we characterize the γ-Al2O3 samples by means of XPS, UPS, and TEM and found no charging. Pronounced effects in temperature-dependent changes of the work function are observed which resul...
Article
Model catalysts based on γ-AlâOâ, prepared by oxidizing Al foils and thin films, are chemically modified by Mo and Pt. Electron spectroscopies reveal the chemical states of Mo and Pt depending on the treatment in oxidizing, reducing, and sulfidizing atmospheres. The authors find Mo to exist in the oxidation states 4+, 5+, and 6+, whereas Pt appear...
Article
Full-text available
El TiO 2 en forma de polvo ultrafino, con tamaño de partícula promedio entre 50 y 100 nm y predominio de la fase anatasa, es el material más comúnmente usado en las plantas de tratamiento de aguas; también es el precursor usual en la preparación de catalizadores soportados para el tratamiento de aire. Resulta por lo tanto importante discutir brevem...

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