The report presents the effects of the thickness on the TiO2 thin films prepared by the GLAD technique with incline spinning substrate on rotating holder (ISSRH) by using the electron beam evaporation. The prepared films were heated at 500 °C for 2 hr in air. The microstructure of films was investigated by UV- visible photometer, X-ray diffraction, XRD and field emission scanning electron microscope, FE-SEM. The results showed the thickness of 10, 50, 100 and 300 nm films exhibited continuity distribution of the crystalline. The crystalline structure evidenced the dominant peak at the 300 nm thickness. GLAD TiO2 films exhibited the columnar growth and porosity. The TiO2 nanostructures showed rutile phase.
Abstract.We have investigated TiO2 nanostructures prepared by anodization in conjunction with hydrothermal method using Ti metal plates. The TiO2 nanoporus were fabricated by electrochemical anodization in a NH4F/EG4/H2O electrolyte system. Ultrasonic wave was used to clean the surface of TiO2 nanoporus in the medium of water after completing the anodization. After drying in air, the nanoporusarrays were calcined at 450 °C for 2 h in air. The TiO2 nanostructures were converted by hydrothermal in air.The TiO2 nanostructures were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). XRD patterns show the TiO2 anatase structure. SEM images indicate that the TiO2 structures depend on preparation temperatures. The density of TiO2 nanostructures increases as the time increases. The growth of TiO2 nanostructures was observed to be times dependence. The nanostructures are nanowires and nanospikes when the peraring time was 18 h, nanoflowers when the preparing time was 24h. This approach provides the capability of creating patterned 1D TiO2 nanowires at 18h. The diameter of TiO2 nanowires varies from 20 nm to 25 nm and length of several 250 nm.
In this work optical properties of CuO nanostructure were studied. CuO nanostructure were synthesized by the hydrothermal treatment method. The structural and chemical natures of the obtained materials were studied using powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and study optical properties by UV-visible spectral. The XRD patterns of the CuO nanostructures indicated that CuO phases (JCPDS 05- 0661). The top-view SEM images, it can be seen clearly that high-density, horizontally scattered nanorod were grown on the product prepared at concentration of NaOH (aq) 7.5 M at 180 C for 12 h. The spectral of UV-vis data recorded showed the strong cut off at 341 nm.
This paper reports the synthesis of CuO nanorods from Copper (II) sulphate (CuSO4) aqueous solution under the hydrothermal condition variable concentration of NaOH (aq) at 160 °C for 12 h. The thin films of the nanorods on glass were prepared by dip-coating technique. The structure and chemical natures of the obtained materials were studied using powder X-ray diffraction (XRD), Scanning Electron Microscopy (SEM). The optical properties of the nanorods were also studied by UV-visible spectra. The diffraction peaks were quite identical to those of pure CuO, which can be indexed as the monoclinic structure CuO. The diameters of CuO nanorods vary from 10 nm to 100 nm and the length is about several micrometers. The top-view SEM images be seen clearly that high-density, horizontally scattered nanorod were grown on the product prepared at concentration of NaOH (aq) 10 M at 160 °C for 12 h. The spectral of UV-vis data showed the strong cut off at 336 nm.
ZnO nanostructures were synthesized by thermal evaporation method using Zn metal plate in air. The Zn metal plates were frozen at -10 C, before into the furnace at a temperature ranging from 300 to 420 C for 15 minutes. The ZnO nanostructures were characterized by X-ray diffraction, XRD and field emission scanning electron microscopy( FE-SEM) and X-ray diffraction( XRD) pattern showed the crystal nanostructure of ZnO. FE-SEM images indicated that the nanowires were depended on temperatures. The diameter of ZnO nanowires werevaried from 50 nm to 70 nm and length of several 100 micrometers.
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