Microstructure of high-performance thermochromic ZrO2/V0.984W0.016O2/ZrO2 coating with a low transition temperature (22 °C) prepared on flexible glass

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23520%2F21%3A43962453" target="_blank" >RIV/49777513:23520/21:43962453 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1016/j.surfcoat.2021.127654" target="_blank" >https://doi.org/10.1016/j.surfcoat.2021.127654</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.surfcoat.2021.127654" target="_blank" >10.1016/j.surfcoat.2021.127654</a>

Result language

angličtina

Original language name

Microstructure of high-performance thermochromic ZrO2/V0.984W0.016O2/ZrO2 coating with a low transition temperature (22 °C) prepared on flexible glass

Original language description

We report on the microstructure of high-performance thermochromic ZrO2/V0.984W0.016O2/ZrO2 coating deposited on ultrathin flexible glass using a pulsed magnetron sputtering without any substrate bias voltage and post-deposition annealing. The coating combines a low transition temperature of 22 °C, an integral luminous transmittance approaching 50% and a modulation of the solar energy transmittance over 10%. The microstructure of the coating was studied mainly by high-resolution transmission electron microscopy and selected area electron diffraction. The active V0.984W0.016O2 layer, prepared at a relatively low temperature of 330 °C, is ~70 nm thick. It is composed of closely packed vertically aligned single-crystalline W-doped VO2 nanocolumns that directly attach to the bottom and the top ZrO2 antireflection layer. The majority of the VO2 nanocolumns have a height of ~70 nm (equal to the thickness of the layer) and a lateral size of ~15 nm to 40 nm. The nanocolumns are formed predominantly by the high-temperature thermochromic tetragonal VO2(R) phase with only minor presence of the metastable non-thermochromic orthorhombic VO2(P) phase, which might be stabilized by the used low W-doping. An array of amorphous, low-density nanodomains of a size ~2–4 nm originated particularly along the interface between the V0.984W0.016O2 layer and the top ZrO2 layer. The V0.984W0.016O2 layer is well adhered to both ZrO2 layers. The ZrO2 layers, prepared at a very low temperature (&lt;60 °C), consist of the monoclinic and the tetragonal ZrO2 phase. The bottom ZrO2 layer (~180 nm thick) exhibits an adherent and seamless interface with the flexible glass substrate. The top ZrO2 layer (~170 nm thick) is sufficiently compact to provide mechanical protection and environmental stability for the thermochromic coating. The results are important for further improvement of the performance of multilayer thermochromic coatings designed for smart-window applications.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20506 - Coating and films

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2021

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Surface and Coatings Technology

ISSN

0257-8972

e-ISSN

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Volume of the periodical

424

Issue of the periodical within the volume

25 OCT 2021

Country of publishing house

CH - SWITZERLAND

Number of pages

10

Pages from-to

127654-1-127654-10

UT code for WoS article

000697567600024

EID of the result in the Scopus database

2-s2.0-85114098037