Durable vanadium dioxide with 33-year service life for smart windows applications

Vu, Tuan Duc; Xie, Hong; Wang, Shancheng; Hu, Jingtian; Zeng, Xin; Yi, Long

doi:10.1016/j.mtener.2022.100978

Cited by 23 publications

(21 citation statements)

References 34 publications

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“…Our focus was to explore the strategies to improve the stability, uniformity, and switching efficiency of the solution-processed films by investigating different types of polymers and their ratio between VO 2 nanocrystals. Though, in previous studies, some approaches have been reported to lower the T c in VO 2 films to make them suitable for smart window applications, , lowering of T c by using those strategies was not within the scope of this work. In future, the film preparation process and their thermochromic performances can be explored using doped VO 2 NPs to lower the temperature of films near room temperature to make them more feasible for practical applications.…”

Section: Resultsmentioning

confidence: 98%

Solution-Processed VO₂ Nanoparticle/Polymer Composite Films for Thermochromic Applications

Kabir

Yang

Kayani

et al. 2022

ACS Appl. Nano Mater.

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Thin films composed of vanadium dioxide (VO2), a well-known thermochromic material with reversible insulator-to-metal-transition near room temperature, are intriguing for intelligent and energy-efficient heat-blocking applications. However, the conventional vacuum-based deposition methods often involve a high-temperature annealing process, and oxidation of VO2 under air exposure further limits their practical applications. In this work, we demonstrate a room-temperature solution process to prepare VO2-based thermochromic thin films using a smart ink composed of crystalline VO2 nanoparticles. To enhance their chemical stability against oxidation and assist in the uniform deposition of the VO2 thin films, polymers were used as both capping agents and for surface modification of the VO2 nanocrystals. Specifically, the concentration of VO2 nanocrystals, the type of polymers, and the molar ratio between VO2 and polymers are systematically tailored, and their effects on the thermochromic performance are also explored. It is revealed that the inclusion of optimum polymers enhanced the thermochromic performance with an almost 4-fold increase in IR switching with a visible luminous transmittance of 86% and a solar modulation of 17.61%. In addition, the inks are compatible with an array of scalable manufacturing processes. We demonstrate uniform films on different substrates, both rigid and flexible, by dip coating, drop casting, and screen printing, offering great feasibility for further scaling up.

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Section: Resultsmentioning

confidence: 98%

Solution-Processed VO₂ Nanoparticle/Polymer Composite Films for Thermochromic Applications

Kabir

Yang

Kayani

et al. 2022

ACS Appl. Nano Mater.

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“…Thermal conductivity can be improved using the thin and thermally conductive materials and/or applying an electrostatic force to enhance contact as being reported previously . The VO 2 is expected to have a service life of ∼16–33 years if it is well encapsulated to prevent water and oxygen. − Reducing the friction can improve the durability and reduce abrasion loss of materials, and potential improvement methods can reduce the layer thickness and increase the gap size as demonstrated in Figures h and S5.…”

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confidence: 90%

On-Demand Solar and Thermal Radiation Management Based on Switchable Interwoven Surfaces

Wang

et al. 2022

ACS Energy Lett.

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On-demand and selective regulation of the radiative cooling (longwave infrared, LWIR) and solar heat gain (ultraviolet-, visible-and near-IR, UV− vis−NIR) of building facades is a grand challenge but essential to decrease energy usage in buildings. Here, we report a reconfigurable interwoven surface that can dynamically switch the overlapping sequence to achieve spectral selectivity and ultrabroadband modulations for windows, walls/roofs with decent spectral modulations, and energy-saving performance. The result surpasses the best reported passive radiative cooling smart windows with a more than doubled visible transmittance (T lum = 0.50) and LWIR modulation (Δ ε LWIR = 0.57). Our energy-saving samples outperform the commercial building materials across climate zones 2−6. This design principle is scalable and applicable for diverse materials, interwoven structures, and 2D-3D surfaces, which provide a strategy to give programmable heating/cooling modulations in various applications.

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“…Heat is a widespread energy source in life, and traditional thermochromic materials often achieve color transformation through thermally induced changes in molecular structure and crystalline state. In contrast, thermally driven deformation is often based on shape memory polymers, whose function is mainly based on the existence of two phases within the material that are not fully compatible, i.e., a fixed phase that maintains the shape of the finished product and a reversible phase that softens/hardens and changes reversibly with temperature changes [ 53 , 54 , 55 , 56 , 57 ].…”

Section: Driving Modes Of Mechanoresponsive Smart Windowsmentioning

confidence: 99%

Review on Mechanoresponsive Smart Windows: Structures and Driving Modes

et al. 2023

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The growing awareness about the global energy crisis and extreme weather from global warming drives the development of smart windows market. Compared to conventional electrochromic, photochromic, or thermochromic smart windows, mechanoresponsive smart windows present advantages of simple construction, low cost, and excellent stability. In this review, we summarize recent developments in mechanoresponsive smart windows with a focus on the structures and properties. We outline the categories and discuss the advantages and disadvantages. Especially, we also summarize six unconventional driving modes to generate mechanical strain, including pneumatic, optical, thermal, electric, magnetic, and humidity modes. Lastly, we provide practical recommendations in prospects for future development. This review aims to provide a useful reference for the design of novel mechanoresponsive smart windows and accelerate their practical applications.

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Durable vanadium dioxide with 33-year service life for smart windows applications

Cited by 23 publications

References 34 publications

Solution-Processed VO₂ Nanoparticle/Polymer Composite Films for Thermochromic Applications

Solution-Processed VO₂ Nanoparticle/Polymer Composite Films for Thermochromic Applications

On-Demand Solar and Thermal Radiation Management Based on Switchable Interwoven Surfaces

Review on Mechanoresponsive Smart Windows: Structures and Driving Modes

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Durable vanadium dioxide with 33-year service life for smart windows applications

Cited by 23 publications

References 34 publications

Solution-Processed VO2 Nanoparticle/Polymer Composite Films for Thermochromic Applications

Solution-Processed VO2 Nanoparticle/Polymer Composite Films for Thermochromic Applications

On-Demand Solar and Thermal Radiation Management Based on Switchable Interwoven Surfaces

Review on Mechanoresponsive Smart Windows: Structures and Driving Modes

Contact Info

Product

Resources

About

Solution-Processed VO₂ Nanoparticle/Polymer Composite Films for Thermochromic Applications

Solution-Processed VO₂ Nanoparticle/Polymer Composite Films for Thermochromic Applications