Next Article in Journal
Polydopamine-Inspired Surface Modification of Polypropylene Hernia Mesh Devices via Cold Oxygen Plasma: Antibacterial and Drug Release Properties
Previous Article in Journal
Unevenness of Thin Liquid Layer by Contact Angle Variation of Substrate during Coating Process
Previous Article in Special Issue
Synthesis of Solution-Stable PEDOT-Coated Sulfonated Polystyrene Copolymer PEDOT:P(SS-co-St) Particles for All-Organic NIR-Shielding Films
Article Menu

Export Article

Open AccessArticle
Coatings 2019, 9(3), 163; https://doi.org/10.3390/coatings9030163

Thermochromic Behavior of VO2/Polymer Nanocomposites for Energy Saving Coatings

1
Institute of Electronic Structure and Laser, Foundation for Research and Technology Hellas 100 N, Plastira str., Vassilika Vouton, 70013 Heraklion, Crete, Greece
2
Department of Physics, University of Crete, 71003 Heraklion, Crete, Greece
3
Department of Material Science & Technology, University of Crete, 71003 Heraklion, Crete, Greece
4
Department of Physics, Crete Center for Quantum Complexity and Nanotechnology, University of Crete, 71003 Heraklion, Crete, Greece
*
Author to whom correspondence should be addressed.
Received: 19 January 2019 / Revised: 21 February 2019 / Accepted: 22 February 2019 / Published: 1 March 2019
(This article belongs to the Special Issue Smart Coatings for Energy Saving Applications)
Full-Text   |   PDF [4494 KB, uploaded 1 March 2019]   |  
  |   Review Reports

Abstract

Vanadium dioxide (VO2) is a well-known thermochromic material that can potentially be used as a smart coating on glazing systems in order to regulate the internal temperature of buildings. Most growth techniques for VO2 demand high temperatures (>250 °C), making it impossible to comply with flexible (polymeric) substrates. To overcome this problem, hydrothermally synthesized VO2 particles may be dispersed in an appropriate matrix, leading to a thermochromic coating that can be applied on a substrate at a low temperature (<100 °C). In this work, we reported on the thermochromic properties of a VO2/Poly-Vinyl-Pyrrolidone (PVP) nanocomposite. More specifically, a fixed amount of VO2 particles was dispersed in different PVP quantities forming hybrids of various VO2/PVP molar ratios which were deposited as films on fused silica glass substrates by utilizing the drop-casting method. The crystallite size was calculated and found to be 35 nm, almost independent of the PVP concentration. As far as the thermochromic characteristics are concerned, the molar ratio of the VO2/PVP nanocomposite producing VO2 films with the optimum thermochromic properties was 0.8. These films exhibited integral solar transmittance modulation (overall wavelengths) ΔTrsol = 0.35%–1.7%, infrared (IR) switching at 2000 nm ΔTrIR = 10%, visible transmittance at 550 nm TrVis = 38%, critical transition temperature TC = 66.8 °C, and width of transmittance hysteresis loop ΔTC = 6.8 °C. Moreover, the critical transition temperature was observed to slightly shift depending on the VO2/PVP molar ratio. View Full-Text
Keywords: hydrothermal synthesis; thermochromic VO2; low-temperature VO2/PVP nanocomposites; thermochromic coatings hydrothermal synthesis; thermochromic VO2; low-temperature VO2/PVP nanocomposites; thermochromic coatings
Figures

Figure 1

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).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Xygkis, M.; Gagaoudakis, E.; Zouridi, L.; Markaki, O.; Aperathitis, E.; Chrissopoulou, K.; Kiriakidis, G.; Binas, V. Thermochromic Behavior of VO2/Polymer Nanocomposites for Energy Saving Coatings. Coatings 2019, 9, 163.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Coatings EISSN 2079-6412 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top