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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 18:03 |
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Conference: Bucharest University Faculty of Physics 2009 Meeting
Section: Atomic and Molecular Physics; Astrophysics
Title:
Characterization of thin oxide layers obtained by
oxygen reaction with copper surfaces
Authors:
Raluca Iordanescu, Cristiana Grigorescu, Mircea Bercu
Affiliation:
University of Bucharest, Faculty of Physics;
INOE
E-mail
iorda85@yahoo.com
Keywords:
Oxygen, copper oxide, surface reaction
Abstract:
The reaction of oxygen with copper surfaces at different temperatures has been used to obtain Cu-oxide thin films on metallic copper substrate. The oxides’ properties related to the oxidation temperature have been investigated mainly by vibration spectrometry techniques. The transitions due to the infrared and Raman activities were monitored versus temperature in the range 160 – 600 0C through the corresponding spectra. According to the specific IR absorption bands of copper oxide found in the samples, the thin films obtained below 250 0C show a single phase Cu2O. Due to the concentration gradient of the oxidative species the top of the initial Cu2O layer is much more exposed to the oxygen attack than the region of the oxide-metal interface thus being turned into CuO phase. According to the experimental conditions of this study the onset of this process has been found at 280 0C. The main absorption bands at 611cm-1(Cu2O) and 470, 540 cm-1(CuO) were monitored for isochronal and isothermal oxidation processes to determine the corresponding activation energies. The optical parameters as real and imaginary part of the refractive index were extracted from the experimental data by an original approach based on UV-Vis simulation spectra.
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