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Coatings 2018, 8(8), 290; https://doi.org/10.3390/coatings8080290

Interconnections between Electronic Structure and Optical Properties of Multilayer Nanolaminate TiAlN/Ag and Al2O3/Ag Coatings

1
Surface Phenomena Researches Group, I.P. Bardin Central Research Institute for Ferrous Metallurgy, 23/9 bdg. 2, Radio str., 105005 Moscow, Russia
2
Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Científicas, E-28049 Madrid, Spain
3
Surface Engineering and Precision Institute, School of Aerospace, Transport and Manufacturing (SATM), Cranfield University, College Road, Cranfield, Bedfordshire MK43 0AL, UK
*
Author to whom correspondence should be addressed.
Received: 27 April 2018 / Revised: 11 August 2018 / Accepted: 11 August 2018 / Published: 18 August 2018
(This article belongs to the Special Issue Surface Engineering and Nanofilms)
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Abstract

Multilayer nanolaminate TiAlN/Ag and Al2O3/Ag metal-insulator-metal (MIM) coatings with thicknesses of individual layers from a few to several hundreds of nanometers were fabricated by direct current magnetron sputtering. Their optical transmittance and reflectance spectra were measured for photon energies 1–5 eV (1240–248 nm). The spectra were non-monotonous as their transmission and reflection bands were strongly dependent on the coating architecture. A set of advanced electron spectroscopy methods was used to analyse the electronic structure of the coatings controlling optical properties. Energies of plasmons peaks and the distribution of their intensities are functions of the Ag layers thickness as well as the composition and thickness of the dielectric nanolayers in the MIM nanocomposite. Statistical analysis established the cross-correlations between geometrical parameters of the coatings, transmissions and reflection bands on the optical spectra and parameters of the electronic structure. Particularly, the blue side of the transmittance band is controlled by plasmons while the dielectric band gap determines the transmittance of the red side. The obtained experimental results allowed us to fulfil the computed architectural design of a multilayer Al2O3/Ag coating with a narrow bandwidth in the visible light region and strong reflection in the infrared and ultraviolet regions. View Full-Text
Keywords: multilayer MIM coatings; TiAlN/Ag; Al2O3/Ag; reflectance; transmittance; electron spectroscopy; Auger electrons spectroscopy (AES); scanning plasmon microscopy; high-resolution electron energy losses spectroscopy (HREELS) multilayer MIM coatings; TiAlN/Ag; Al2O3/Ag; reflectance; transmittance; electron spectroscopy; Auger electrons spectroscopy (AES); scanning plasmon microscopy; high-resolution electron energy losses spectroscopy (HREELS)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Wainstein, D.; Kovalev, A.; Vakhrushev, V.; Gago, R.; Endrino, J.L. Interconnections between Electronic Structure and Optical Properties of Multilayer Nanolaminate TiAlN/Ag and Al2O3/Ag Coatings. Coatings 2018, 8, 290.

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