Optical and Electrical Properties of Thin Films of CuS Nanodisks Ensembles Annealed in a Vacuum and Their Photocatalytic Activity

Effects on the optical, electrical, and photocatalytic properties of undoped CuS thin films nanodisks vacuum annealed at different temperatures were investigated. The chemical bath prepared CuS thin films were obtained at 40°C on glass substrates. The grain size of 13.5±3.5 nm was computed directly from high-resolution transmission electron microscopy (HRTEM) images. The electrical properties were measured by means of both Hall effect at room temperature and dark resistivity as a function of the absolute temperature 100–330 K. The activation energy values were calculated as 0.007, 0.013, and 0.013 eV for 100, 150, and 200°C, respectively. The energy band gap of the films varied in the range of 1.98 up to 2.34 eV. The photocatalytic activity of the CuS thin film was evaluated by employing the degradation of aqueous methylene blue solution in the presence of hydrogen peroxide. The CuS sample thin film annealed in vacuum at 150°C exhibited the highest photocatalytic activity in presence of hydrogen peroxide

Effect of gamma-irradiation on the growth of ZnO nanorod films for photocatalytic disinfection of contaminated water

321-2009-Concytec-OAJConsejo Nacional de Ciencia, Tecnología e Innovación Tecnológica - Concyte

Structure and morphology of high quality indium-doped ZnO films obtained by spray pyrolysis

Indium-doped zinc oxide thin films were prepared by spray pyrolytic decomposition of zinc acetate with indium acetate in an alcoholic solution. The films were deposited onto soda lime glass substrate, alumina, and sodium chloride crystal. X-Ray energy dispersive spectroscopy (EDS) and rutherford backscattering spectroscopy (RBS) were used to determine film composition. More detailed information about the crystallographic structure of the films was obtained with the application of Rietveld refinement method to analyse X-ray diffraction spectra. From the position and shape of the X-ray line profiles lattice parameters, domain size and micro strains were determined. Small. In amounts (< 3 at.%) cause decreasing lattice parameters, then, with further In insertion an increase of these parameters is observed. Preferential growth orientation was dependent on the In contents. The inverse pole figure (IPF), in the direction normal to the surface, was obtained semi-quantitativel

Synthesis of Poly(styrene-acrylates-acrylic acid) Microspheres and Their Chemical Composition towards Colloidal Crystal Films

In this paper, polystyrene colloidal microspheres have been prepared using hexyl acrylate (HA), ethylhexyl acrylate (EHA), isooctyl acrylate (IOA), butyl acrylate (BA), or isobutyl acrylate (IBA) as comonomers. Microspheres with diameters from 212 to 332 nm and with a polystyrene content of 65–78% were prepared. The particles prepared in this work do not present the typical core-shell structure; as a consequence, DSC analysis showed that the microspheres exhibited only one Tg. TEM images show that the particles with comonomer content below ~30% were spherical and regular. Microspheres containing comonomer between 21 to 25% produced the less brittle films showing very iridescent colors. The films prepared from microspheres containing hexyl, ethylhexyl, and isooctyl acrylate as comonomers are firmly attached to the substrate due to their adhesive properties. The large decrease of the fragility observed in these films makes them much more attractive materials in sensing applications