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Open AccessFeature PaperArticle

Anomalous Heat Transport in Nanolaminate Metal/Oxide Multilayer Coatings: Plasmon and Phonon Excitations

1
Surface Phenomena Researches Group, I.P. Bardin Central Research Institute for Ferrous Metallurgy, 105005 Moscow, Russia
2
Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Científicas, E-28049 Madrid, Spain
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Basque Center for Materials, Applications & Nanostructures, UPV/EHU Science Park, Barrio Sarriena s/n, 48940 Leioa, Spain
4
IKERBASQUE, Basque Foundation for Science, Maria Diaz de Haro 3, 48013 Bilbao, Spain
*
Author to whom correspondence should be addressed.
Coatings 2020, 10(3), 260; https://doi.org/10.3390/coatings10030260
Received: 27 January 2020 / Revised: 9 March 2020 / Accepted: 10 March 2020 / Published: 11 March 2020
(This article belongs to the Special Issue Nanolaminate Multilayer Coatings)
In this work, the anomalous reduction in the thermal conduction observed for nanolaminate metal-dielectric multilayers has been extended to the case of oxides. For this purpose, Ag/Al2O3 coatings were produced with different layer thicknesses (from 1 to 5 nm for Ag and 8 to 40 nm for Al2O3) and numbers of stacks. It was found that the thermal conduction is significantly lower in such metal–oxide nanolaminates compared to the bulk oxide. Such anomalous behaviour is explained by the influence of plasmon and phonon propagation confinement in nanolayers and at the interfaces. To this end, the characteristics of the different types of acoustic and optical phonon waves propagating in the multilayer coating have been studied. In particular, the electronic structures of the different layers and their influences on the plasmon resonance are investigated as a function of the multilayer design. The plasmon-polariton mechanism of energy transfer through oxide–metal and metal–oxide interfaces is discussed. View Full-Text
Keywords: multilayer Al2O3/Ag heterostructures; physical vapour deposition (PVD); thermal conductivity; interface; size effect; plasmon; phonon propagation; confinement; high resolution electron energy loss spectroscopy (HREELS) multilayer Al2O3/Ag heterostructures; physical vapour deposition (PVD); thermal conductivity; interface; size effect; plasmon; phonon propagation; confinement; high resolution electron energy loss spectroscopy (HREELS)
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MDPI and ACS Style

Kovalev, A.; Wainstein, D.; Vakhrushev, V.; Gago, R.; Endrino, J.L. Anomalous Heat Transport in Nanolaminate Metal/Oxide Multilayer Coatings: Plasmon and Phonon Excitations. Coatings 2020, 10, 260.

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