Abstract
Optical properties of chromium oxide (Cr2O3) thin films which were prepared by pulse laser deposition method, onto glass substrates. Different laser energy (500-900) mJ were used to obtain Cr2O3 thin films with thickness ranging from 177.3 to 372.4 nm were measured using Tolansky method. Then films were annealed at temperature equal to 300 °C. Absorption spectra were used to determine the absorption coefficient of the films, and the effects of the annealing temperature on the absorption coefficient were investigated. The absorption edge shifted to red range of wavelength, and the optical constants of Cr2O3 films increases as the annealing temperature increased to 300 °C. X-ray diffraction (XRD) study reveals that Cr2O3 thin films are amorphous; while the crystal structure of annealed Cr2O3 films is rhombohedral after annealing at 300 °C for two hour. AFM studies of Cr2O3 thin films exhibit a smooth and well dispersed on the surface.
Highlights
Chromium oxide (Cr2O3)nanoparticles are of interest for applications such as green pigments, wear resistance, thermal protection, digital recording systems, and chemical catalysts [1]
The optical transmittance spectra for Cr2O3 thin films prepared by PLD technique at R.T., and annealed at 300 °C; using different energies are shown in Figs. 2 and 3
It is clear from these figures that for each analyzed thin film it has been noticed that the transmittance decreased with increasing annealing temperature
Summary
Chromium oxide (Cr2O3)nanoparticles are of interest for applications such as green pigments, wear resistance, thermal protection, digital recording systems, and chemical catalysts [1]. Iraqi Journal of Physics, 2018 thermodynamically stable phase above 500 °C, and is interesting for its very high hardness and chemical resistance properties. It is used as a protective coating on hightemperature battery electrodes, as intermediate layers in corrosionresistant applications on semiconductors and metals, as wearresistant layers on magnetic particles, and as anti-oxidation layers on metals such as stainless steel [3, 4]. Literature reports indicate that Cr2O3 thin films have been produced by a number of techniques by a number of researchers These include the vacuum evaporation [6], sputtering [4], Chemical Vapor Deposition (CVD) [5], Spray pyrolysis [7] and reactive pulsed laser ablation techniques [8]
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