Michael Morales Luna

Tecnológico de Monterrey | ITESM · School of Engineering and Sciences - Department of Chemistry and Nanotechnology

The present work analyses the transmittance and reflectance spectra of molybdenum trioxide film doped by silver nanoparticles as a function of angle of incidence and wavelength. As will be seen in this work, at values of angle of incidence below 40 degrees and with volume filling fraction below 1% also, some differences between the two Effective Me...

We used thermal evaporation and post-deposition thermal treatment to prepare photoconductive Ag-Sb-S thin films. Firstly, to obtain the Ag2S/Sb2S3/substrate samples, we sequentially evaporated both Sb2S3 and Ag2S precursors. Secondly, we converted the double-layered structure in Ag-Sb-S thin films through a post-annealing treatment. Finally, consid...

Abstract Antimony doped tin oxide (ATO) thin films are deposited on corning glass substrate using the spray pyrolysis technique. The experimental parameters such as distance between the substrate and source (10-30 cm), substrate temperature (350-450°C) and atmospheres (Nitrogen and Forming gas) are varied to study their effect on the properties of...

his work focused on the application of the effective medium theory to describe the extinction coefficient (Qext) in molybdenum trioxide (MoO3) doped with different kinds of plasmonic nanoparticles, such as silver (Ag), gold (Au), and copper (Cu). Usually, in studies of these materials, it is normal to analyze the transmission or absorption spectra....

Yttrium oxide nanostructures doped with erbium and ytterbium ions were incorporated into a titanium dioxide (TiO 2) host by a hydrother-mal method to modify the bandgap of TiO 2. The samples were prepared with different concentrations of nanophosphors (Y 2 O 3 : Er 3+-Yb 3+). Then, the samples were characterized by x-ray diffraction (XRD), transmis...

Molybdenum oxide thin films were deposited using the laser ablation technique, at three values of working pressure and four values of the mean kinetic energy (E k) of the plasma ions. The structural characterization of the films performed by X-ray diffraction and Raman spectroscopies showed the presence of the a-MoO 3 phase in all cases. On the oth...

Molybdenum oxide thin films were deposited using the laser ablation technique, at three values of working pressure and four values of the mean kinetic energy (Ek) of the plasma ions. The structural characterization of the films performed by X-ray diffraction and Raman spectroscopies showed the presence of the α–MoO3 phase in all cases. On the other...

The growing interest in functional transition metal oxides for efficient energy consumption or in the bio-sensing process; indicates that is necessary to develop a new theoretical method that describes experiments. This article presents a new theoretical methodology to characterize molybdenum trioxide (MoO3) thin films doped with resonant gold – na...

Undoped and Al, B and Ga-doped In2S3 thin films were deposited on flexible PET/ITO substrates using chemical bath deposition by varying the deposition temperatures (60, 70, 80 and 90 °C) and growth times (120, 150 and 180 min). Citric acid was used as complexing agent along with indium trichloride and thioacetamide as indium and sulfur sources, res...

The influence of a cadmium selenide (CdSe) layer on the thermochromic and photochromic properties of molybdenum trioxide (MoO3) thin films was studied. The films were deposited on glass substrates by thermal evaporation in vacuum using two different bilayer configurations, namely, substrate/MoO3/CdSe (SMC) and substrate/CdSe/MoO3 (SCM). The film th...

The role of the sputtering power, film thickness, and sputtering working pressure on the adsorption capacity and photocatalytic activity of MoO3 thin films was studied. The MoO3 thin films were deposited at room temperature by radio frequency reactive magnetron sputtering and subsequently post-annealed in air at 500 °C. X-ray diffractograms reveale...

The role of the sputtering power, film thickness, and sputtering working pressure on the adsorption capacity and photocatalytic activity of MoO3 thin films was studied. The MoO3 thin films were deposited at room temperature by radio frequency reactive magnetron sputtering and subsequently post-annealed in air at 500 °C. X-ray diffractograms reveale...

The thermochromic, photochromic, and electrochromic properties of molybdenum trioxide (MoO3) thin films were studied. MoO3 thin films were deposited by rf reactive magnetron sputtering and the influence of deposition parameters, i.e. O2/Ar gas ratio and working pressure, on the chromogenic properties was investigated. Thermochromism was induced by...

The photocatalytic activity of molybdenum trioxide (MoO3) thin films was studied. The MoO3 thin films were deposited on Corning glass substrates by radio frequency reactive magnetron sputtering using a metallic Mo target. The dependence of the physical properties of the metal oxides on the sputtering power and working pressure was investigated. X-r...

Molybdenum trioxide (MoO3) thin films were deposited on glass substrates by rf reactive magnetron sputtering using a metallic molybdenum target. The thermochromic effect was induced by exposing the samples to either argon or air at specific temperatures within the range 25–300 °C. Optical absorption spectra indicated that the samples annealed in ar...

The effect of thermal annealing in an inert atmosphere (argon) on the structural and thermochromic properties of MoO 3 thin films was investigated. MoO 3 thin films were deposited by thermal evaporation in vacuum of MoO 3 powders. X-ray diffraction patterns of the films showed the presence of the monoclinic Magneli phase Mo 9 O 26 for annealing tem...

The effect of deposition conditions on the photocatalytic activity of TiO2-ZnO thin films was studied. By using a (Ti)90-(Zn)10 alloy target, the samples were deposited at room temperature on glass substrates by dc reactive magnetron sputtering and post-annealed in air at 500 °C. The dependence of the physical properties of the films on the O2/Ar g...

The effect of thermal annealing in an inert atmosphere (argon) on the structural and thermochromic properties of MoO 3 thin films was investigated. MoO 3 thin films were deposited by thermal evaporation in vacuum of MoO 3 powders. X-ray diffraction patterns of the films showed the presence of the monoclinic Magneli phase Mo 9 O 26 for annealing tem...

We investigated the electrochromic properties of tungsten–nickel–titanium oxide (W 1–x–y Ni x Ti y O 3) thin films. Special emphasis was put on W 0.83–x Ni x Ti 0.17 O 3 since this composition gave the highest electrochemical durability. The films were deposited onto indium–tin oxide coated glass by reactive DC magnetron sputtering, and cyclic volt...

We investigated the electrochromic properties of tungsten–nickel–titanium oxide (W1–x–yNixTiyO3) thin films. Special emphasis was put on W0.83–xNixTi0·17O3 since this composition gave the highest electrochemical durability. The films were deposited onto indium–tin oxide coated glass by reactive DC magnetron sputtering, and cyclic voltammetry as wel...

Previous research demonstrated that a small amount of nickel enhances the coloration efficiency of tungsten–nickel oxide electrochromic (EC) thin films with respect to that of pure tungsten oxide (WO3) films. Furthermore the incorporation of titanium gives an improvement in the durability of tungsten–titanium oxide EC thin films. In this work we in...

Previous research demonstrated that a small amount of nickel enhances the coloration efficiency of tungsten–nickel oxide electrochromic (EC) thin films with respect to that of pure tungsten oxide (WO3) films. Furthermore the incorporation of titanium gives an improvement in the durability of tungsten–titanium oxide EC thin films. In this work we in...

The effect of a ZnSe layer on the thermochromic properties of MoO3 thin films was investigated. ZnSe/MoO3 and MoO3 thin films were deposited by thermal evaporation in vacuum of MoO3 and ZnSe powders. Photoacoustic spectra of the films indicated that the thermochromic response for the ZnSe/MoO3 bilayer system was more accentuated, with respect to th...

The photochromic and thermochromic properties of molybdenum oxide (MoO3) thin films doped with zinc selenide (ZnSe) were studied. The films were deposited on glass substrates by thermal evaporation of MoO3-ZnSe powder mixtures. EDS measurements confirmed the incorporation of ZnSe in the MoO3 matrix while MicroRaman spectra of the samples showed st...

The effect of a ZnSe layer on the thermochromic properties of MoO 3 thin films was investigated. ZnSe/MoO 3 and MoO 3 thin films were deposited by thermal evaporation in vacuum of MoO 3 and ZnSe powders. Photoacoustic spectra of the films indicated that the thermochromic response for the ZnSe/MoO 3 bilayer system was more accentuated, with respect...

The effect of a ZnSe layer on the thermochromic properties of MoO 3 thin films was investigated. ZnSe/MoO 3 and MoO 3 thin films were deposited by thermal evaporation in vacuum of MoO 3 and ZnSe powders. Photoacoustic spectra of the films indicated that the thermochromic response for the ZnSe/MoO 3 bilayer system was more accentuated, with respect...

We apply the transfer matrix method to study optical transmission properties of multilayered structures with complex and negative indices. We show that the true refraction angle of electromagnetic waves in complex permittivity media does not change sign at low frequencies. Based on the invariance of the slab's scattering amplitudes, we show that it...