“School of Physics”
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| Paper IPM / P / 9559 |
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| Abstract: | |||||||||||
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Cu@Cu2O core-shell nanoparticles on the a-C:H thin films are prepared by co-deposition of RF-Sputtering
and RF-PECVD. The samples with different Cu concentration and Cu nanoparticle with different size are
grown. X-ray photoelectron spectroscopy (XPS) characterization indicates that the surface of the Cu
nanoparticles oxidizes when they are exposed to air. The results are indicative that the shell of
nanoparticle is mainly Cu2O phase with CuO cover thin layer. Surface plasmon resonance (SPR) peak that
is signature of the existence of the Cu core nanoparticles appears in visible spectra of these films. Several
interesting information are obtained from XPS study of these core-shells nanoparticles. The CuO/Cu2O
ratio that is obtained by deconvolution of Cu2p[3/2] main peak and from intensity ratio of the main and
satellite peak of Cu2p[3/2] are consistent. Background of XPS spectra is assigned to the scattering
photoelectrons from Cu ions and plasmon of Cu nanoparticles. We observed that Cu core addition to
copper oxide improves absorption of CO gas.
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