Strategies for Enhanced Optical Performance and Durability of VO<sub>2</sub>‐Based Thermochromic Windows

Alsaadi, Mtawa; Lerttraikul, Kittitat; Chatraphorn, Sojiphong; Kittiwatanakul, Salinporn

doi:10.1002/adem.202302224

Adv Eng Mater

2024

DOI: 10.1002/adem.202302224

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Strategies for Enhanced Optical Performance and Durability of VO₂‐Based Thermochromic Windows

Mtawa Alsaadi,

Kittitat Lerttraikul,

Sojiphong Chatraphorn

et al.

Abstract: Due to the growing need for smart windows for buildings to reduce energy usage, vanadium dioxide (VO2) has been investigated as a potential material for thermochromic smart windows due to its ease of implementation and simplicity in industrial production. VO2 undergoes a reversible phase shift from a monoclinic (M, P21/c) semiconductor to a rutile (R, P42/mnm) metal at a critical temperature of 68 °C. This transition is accompanied by acute variations in IR reflectance, transmittance, and electrical resistance… Show more

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Cited by 2 publications

References 179 publications

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Inverted optical functionality of phase change material surfaces through Mie resonances of VO₂@Si core–shell structures

Pirouzfam,

Mashinchi Abbasi,

Sendur

2024

J. Opt. Soc. Am. B

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Vanadium dioxide (VO2) has attracted extensive attention due to its reversible transition from the insulator to metal phase at a critical temperature of 68°C. Below the critical temperature VO2 transmits the infrared radiation in the insulator phase, whereas above the critical temperature VO2 reflects the infrared portion of the incident radiation. However, smart surface interfaces for high-temperature emitter surfaces require the opposite functionality within the 1–3 µm spectral range. Here, we demonstrate that a core–shell structure, composed of VO2@Si, which is deposited on a thin layer of Ag, achieves the inverted optical functionality within the 1–3 µm spectral range, making it ideal as smart interfaces for radiative heat applications as high-temperature emitters. The proposed material architecture also increases the thermal stability of VO2 in addition to enhancing its optical properties in near-infrared region. The results were obtained using numerical simulations. Our results indicate that in its metallic state, the core–shell structure with metallic underlayer promotes efficient absorption in the near-infrared spectrum. On the other hand, in its insulating state dielectric resonances within the core–shell structure along with the metallic underlayer, resulting in increased reflection, offer inverse optical functionalities. Our findings present a significant step toward designing dynamic filters that can efficiently capture and respond to changing conditions in the near-infrared spectrum.

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Inverted optical functionality of phase change material surfaces through Mie resonances of VO₂@Si core–shell structures

Pirouzfam,

Mashinchi Abbasi,

Sendur

2024

J. Opt. Soc. Am. B

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Towards Passive Building Thermal Regulation: A State-of-the-Art Review on Recent Progress of PCM-Integrated Building Envelopes

Jiao,

Lu,

Zhao

et al. 2024

Sustainability

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The building envelope serves as a barrier against climatic conditions and as insulation to prevent energy waste within buildings. As global energy shortages become more pressing, the requirements for building envelopes are becoming increasingly stringent. Among the available technologies, phase change materials (PCMs) stand out for their high latent thermal energy storage and temperature stabilization capabilities. This paper reviews the recent advancements in PCM technology for building envelopes, starting with an overview of organic, inorganic, and eutectic PCMs, along with their respective advantages and disadvantages. The paper explores various incorporation methods such as shape stabilization, macroencapsulation, micro/nanoencapsulation, and solid–solid transition techniques. The integration of PCMs enhances thermal inertia, reduces thermal fluctuations, and delays heat peaks, presenting several multifunctional benefits. However, challenges such as fire hazards, potential toxicity, pollution, reduced mechanical performance, and higher initial costs persist. In light of these challenges, criteria for PCM integration in building applications are introduced. Additionally, the paper reviews recent hybrid technologies that combine PCMs with other novel technologies for building envelopes, including radiant temperature regulation systems, thermochromic windows, passive radiative cooling coatings, and others. It is shown that these PCM-integrated hybrid technologies significantly improve energy savings and indoor comfort. PCMs offer substantial potential for modern green building strategies and have further applications in other building contexts. Finally, the paper provides future prospects for studies in this field, aiming towards a green and energy-saving future.

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Strategies for Enhanced Optical Performance and Durability of VO₂‐Based Thermochromic Windows

Cited by 2 publications

References 179 publications

Inverted optical functionality of phase change material surfaces through Mie resonances of VO₂@Si core–shell structures

Inverted optical functionality of phase change material surfaces through Mie resonances of VO₂@Si core–shell structures

Towards Passive Building Thermal Regulation: A State-of-the-Art Review on Recent Progress of PCM-Integrated Building Envelopes

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Strategies for Enhanced Optical Performance and Durability of VO2‐Based Thermochromic Windows

Cited by 2 publications

References 179 publications

Inverted optical functionality of phase change material surfaces through Mie resonances of VO2@Si core–shell structures

Inverted optical functionality of phase change material surfaces through Mie resonances of VO2@Si core–shell structures

Towards Passive Building Thermal Regulation: A State-of-the-Art Review on Recent Progress of PCM-Integrated Building Envelopes

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Product

Resources

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Strategies for Enhanced Optical Performance and Durability of VO₂‐Based Thermochromic Windows

Inverted optical functionality of phase change material surfaces through Mie resonances of VO₂@Si core–shell structures

Inverted optical functionality of phase change material surfaces through Mie resonances of VO₂@Si core–shell structures