Título

Microstructural characterization, optical and photocatalytic properties of bilayered CuO and ZnO based thin films

Autor

ANGELICA SAENZ TREVIZO

PATRICIA AMEZAGA MADRID

PEDRO PIZA RUIZ

OSCAR OMAR SOLIS CANTO

CARLOS ELIAS ORNELAS GUTIERREZ

MARIO MIKI YOSHIDA

Nivel de Acceso

Acceso Abierto

Licencia

http://creativecommons.org/about/cc0/

Materias

Thin films - (VAPOR DEPOSITION) Microstructure - (OPTICAL PROPERTIES) SEM - (TEM) CIENCIAS FÍSICO MATEMÁTICAS Y CIENCIAS DE LA TIERRA - (CTI) FÍSICA - (CTI) OTRAS ESPECIALIDADES FÍSICAS - (CTI) OTRAS - (CTI)

Resumen o descripción

In this work, it is presented the synthesis, microstructural characterization and

photocatalytic properties of bilayered CuO–ZnO/ZnO thin films onto borosilicate glass

and fused silica substrates. The films were deposited by aerosol assisted chemical

vapor deposition, using an experimental setup reported elsewhere. Deposition

conditions were optimized to get high quality films; i.e. they were structurally uniform,

highly transparent, non-light scattering, homogeneous, and well adhered to the

substrate. Different Cu/Zn atomic ratios were tried for the upper layer. The

microstructure of the films was characterized by grazing incidence X-ray diffraction

(GIXRD), scanning electron microscopy (SEM), high resolution transmission electron

microscopy (HRTEM) and X-ray photoelectron spectroscopy. GIXRD results indicate

the presence of ZnO Wurzite and Cu oxide phases. Results of SEM and HRTEM

analysis of the cross sectional microstructure showed that the films were composed of

compact and dense layers with no visible evidence of an interfacial boundary or

porosity. Optical absorbance of the bilayered films showed a clear shift of the absorption

toward the visible range. Optical band gap was determined roughly at 3.2 and 2 eV for

ZnO and Cu oxide, respectively. Photocatalytic activity of the samples, for the

degradation of a 10-5 mol dm-3 solution of methylene blue (MB), was determined after

120 and 240 min of irradiation with an UV-A source. Around 90% of MB degradation was reached by bilayered films with roughly 50 at.% of Cu in the upper Zn–Cu oxide layer deposited onto a ZnO buffer film.

Fecha de publicación

2014

Tipo de publicación

Memoria de congreso

Versión de la publicación

Versión enviada

Recurso de información

http://cimav.repositorioinstitucional.mx/jspui/handle/1004/1829

Formato

application/pdf

Idioma

Inglés

Repositorio Orígen

Fuente de Objetos Científicos Open Access

Descargas

869