Sol–gel-derived percolative copper film

“…The lower band gap is for CuO of 1.2 eV, which is mainly used in device applications such as catalysis and photo-catalysis, humidity and gas sensors [3][4][5]. Many techniques were used to prepare high quality copper oxide thin films such as activated reactive evaporation, thermal oxidation, spray pyrolysis [6], chemical deposition [7], sol-gel [8], electro-deposition [9][10][11], electron beam deposition and pulsed laser deposition and sputtering [12]. Both monoclinic CuO and cubic Cu 2 O crystalline phases are characterized by two diffraction peaks in XRD measurements that are close to each other, i.e.…”

Section: Introductionmentioning

confidence: 99%

Determination of the optical band gap for amorphous and nanocrystalline copper oxide thin films prepared by SILAR technique

Rafea¹,

Roushdy²

2008

J. Phys. D: Appl. Phys.

144

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Amorphous copper oxide films were deposited using the SILAR technique. Both Cu2O and CuO crystallographic phases exist in deposited and annealed films. Crystallization and growth processes by annealing at temperatures up to 823 K form grains with nano- and micro-spherical shapes. The calculated crystallite size from the XRD measurement was found to be in the range 14–21 nm while nano-spheres in the diameter range 50–100 nm were observed by SEM micrographs. The band gap for amorphous film was found to be 2.3 eV which increased slowly to 2.4 eV by annealing the film at 373 K. This was explained by defect redistribution in amorphous films. Annealing in the temperature range 373–673 K decreased the band gap gradually to 1.85 eV. The decrease of the band gap with annealing temperature in the range 373–673 K agrees well with the Brus model of the energy gap confinement effect in nanostructured semiconducting materials. Annealing in the temperature range 673–823 K decreases the band gap slowly to 1.7 eV due to the smaller contribution of the confinement effect. Below 573 K, Cu2O is the most probable crystalline phase in the film, while Cu2O and CuO crystalline phases may coexist at annealing temperatures above 573 K due to further oxidation of Cu2O. A wider transmittance spectral window in the visible region was obtained by controlling the annealing conditions of the amorphous copper oxide film and its applicability to the window layer of solar cell was suggested.

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“…Nanoparticles of metal oxide have potential to replace noble metal catalysts for carbon monoxide oxidation [6] . Nano-fluids of metal oxide nanoparticles have excellent thermal conductivity suitable for their applications as heat transfer fluids in machine tools.Different techniques have been applied to prepare metal oxide thin films [7][8].…”

Section: Introductionmentioning

confidence: 99%

Spectral and Physical Studies on Some Metal Complexes of Lysine Amino Acid and the Adsorption Properties of their Nano Oxides

El–Dossoki

Rady

Hosny

2020

Alfarama Journal of Basic & Applied Sciences

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Lys-Zn, Lys-Co, Lys-Cu and Lys-Ni complexes prepared by reaction of metal acetates with lysine (Lys). Complexes were characterized by elemental analysis (C, H, N and M), (UV/Vis) electronic spectra, FT-IR, 1H-13C NMR, (ESR) spectroscopy, Thermal analyses (TGA) and magnetic moments measurements. Physical studies were applied on the synthesis complexes such as solubility, density, molar volume, refractive index and excess refractive index and electronic (UV/Vis) spectra measurements. Nickel oxide nanoparticles synthesized from calcinations of complex at 800 o C. Nanoparticles were characterized by (XRD) and (TEM). Molecular size is at range 43-52 nm. Nanoparticles were used to remove dyes from aqueous solution such as methylene blue (MB) and the percent of removal is 96 %. The best model which represents the adsorption of MB is Langmuir isotherm. The best model for adsorption kinetic of MB ispseudo-second-order model with determination coefficient (R 2 ) close to the unity.

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Sol–gel-derived percolative copper film

Cited by 10 publications

References 33 publications

Nanocrystalline p-type-cuprous oxide thin films by room temperature chemical bath deposition method

Nanocrystalline p-type-cuprous oxide thin films by room temperature chemical bath deposition method

Determination of the optical band gap for amorphous and nanocrystalline copper oxide thin films prepared by SILAR technique

Spectral and Physical Studies on Some Metal Complexes of Lysine Amino Acid and the Adsorption Properties of their Nano Oxides

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