Nonmetal–metal transition in carbon films embedded by nickel nanoparticles: absorption coefficients studies and Wemple–Didomenico dispersion parameters

Nonmetal–metal transition in carbon films embedded by nickel nanoparticles: absorption... In this paper, the optical properties of carbon films embedded by Ni nanoparticles under four deposition processing using mosaic targets made of graphite and nickel with Ni surface areas from 1.78 to 4.64% with a special emphasis on the absorption edge were investigated. Resulting films with Ni surface areas 1.78, 3.21, 3.92 and 4.64% have approximately Ni atomic ratio of about 59.7, 86.5, 90 and 92.9 wt%, respectively. The optical reflectance and transmittance spectra in the wavelength range 300–2500 nm were used to compute the absorption coefficient. The optical dispersion parameters were calculated according to Wemple and Didomenico single oscillator model (WDD). The variation of complex optical conductivity σ with energy of films exhibit values for optical gaps from about 0.8 to 4 eV which correspod to the fundamental indirect and direct gap which are about 0.3 to 3.7 eV. It can be seen that at Ni surface areas 3.92% the films have minimum indirect optical band gap about 0.2 eV. Due to high Ni content of films at 4.64%, they have maximum disordered. It can be seen that these optical properties were in consistent with room temperature electrical resistivity of films. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Optical and Quantum Electronics Springer Journals

Nonmetal–metal transition in carbon films embedded by nickel nanoparticles: absorption coefficients studies and Wemple–Didomenico dispersion parameters

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Publisher
Springer US
Copyright
Copyright © 2017 by Springer Science+Business Media, LLC
Subject
Physics; Optics, Lasers, Photonics, Optical Devices; Electrical Engineering; Characterization and Evaluation of Materials; Computer Communication Networks
ISSN
0306-8919
eISSN
1572-817X
D.O.I.
10.1007/s11082-017-1092-6
Publisher site
See Article on Publisher Site

Abstract

In this paper, the optical properties of carbon films embedded by Ni nanoparticles under four deposition processing using mosaic targets made of graphite and nickel with Ni surface areas from 1.78 to 4.64% with a special emphasis on the absorption edge were investigated. Resulting films with Ni surface areas 1.78, 3.21, 3.92 and 4.64% have approximately Ni atomic ratio of about 59.7, 86.5, 90 and 92.9 wt%, respectively. The optical reflectance and transmittance spectra in the wavelength range 300–2500 nm were used to compute the absorption coefficient. The optical dispersion parameters were calculated according to Wemple and Didomenico single oscillator model (WDD). The variation of complex optical conductivity σ with energy of films exhibit values for optical gaps from about 0.8 to 4 eV which correspod to the fundamental indirect and direct gap which are about 0.3 to 3.7 eV. It can be seen that at Ni surface areas 3.92% the films have minimum indirect optical band gap about 0.2 eV. Due to high Ni content of films at 4.64%, they have maximum disordered. It can be seen that these optical properties were in consistent with room temperature electrical resistivity of films.

Journal

Optical and Quantum ElectronicsSpringer Journals

Published: Jul 12, 2017

References

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