Infrared Gasochromic Devices Based on Metal Thin Films

Cheng, Baizhang; Liu, Dongqing; Jia, Yan; Cheng, Haifeng

doi:10.1002/adom.202201702

Cited by 4 publications

(1 citation statement)

References 62 publications

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“…The IR emissivity/reflectivity of materials can also be electrically modulated. , Under the condition that ωτ ≪ 1 (ω is the angular frequency of the electromagnetic wave, τ is the relaxation time of conducting electrons in materials), the relationship between the spectral normal emissivity (ε) and the electrical resistivity (ρ) for a certain material approximately satisfies the Hagen–Rubens equation in the long-wavelength region (λ > 5 μm): − ε = 2 2 ρ ε 0 ω where ε 0 is the vacuum electric permittivity. Tunning carrier densities and electrical properties of materials is thus feasible to manipulate their IR emissivity.…”

Section: Bioinspired Thermal Energy Regulationmentioning

confidence: 99%

Biological and Bioinspired Thermal Energy Regulation and Utilization

Shi

Jiang

et al. 2023

Chem. Rev.

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The regulation and utilization of thermal energy is increasingly important in modern society due to the growing demand for heating and cooling in applications ranging from buildings, to cooling high power electronics, and from personal thermal management to the pursuit of renewable thermal energy technologies. Over billions of years of natural selection, biological organisms have evolved unique mechanisms and delicate structures for efficient and intelligent regulation and utilization of thermal energy. These structures also provide inspiration for developing advanced thermal engineering materials and systems with extraordinary performance. In this review, we summarize research progress in biological and bioinspired thermal energy materials and technologies, including thermal regulation through insulation, radiative cooling, evaporative cooling and camouflage, and conversion and utilization of thermal energy from solar thermal radiation and biological bodies for vapor/electricity generation, temperature/infrared sensing, and communication. Emphasis is placed on introducing bioinspired principles, identifying key bioinspired structures, revealing structure–property–function relationships, and discussing promising and implementable bioinspired strategies. We also present perspectives on current challenges and outlook for future research directions. We anticipate that this review will stimulate further in-depth research in biological and bioinspired thermal energy materials and technologies, and help accelerate the growth of this emerging field.

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Section: Bioinspired Thermal Energy Regulationmentioning

confidence: 99%

Biological and Bioinspired Thermal Energy Regulation and Utilization

Shi

Jiang

et al. 2023

Chem. Rev.

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Dynamic Infrared Radiation Regulator Enabling Positive and Reversible Modulation of Emissivity and Temperature

Huang,

Yuan,

Liao

et al. 2024

Adv Materials Technologies

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The ongoing advancements and growing adoption of infrared detection technology have spurred a tremendous amount of interest in thermal camouflage technology. Various approaches are employed to develop infrared camouflage materials capable of manipulating emissivity or surface temperature. However, the range of thermal radiation regulation implemented by these materials is still somewhat limited. In this paper, a combined emissivity and temperature regulation strategy that integrates a thermoelectric device (TED) and a thermochromic structure is proposed. By utilizing this strategy, it becomes possible to simultaneously control the surface temperature and the emissivity without needing additional complex excitation. As a concept demonstration, large tunabilities of 0.38 for long‐wave infrared (8–14 µm) emittance and 87 °C for surface temperature are observed, resulting in a prominent tunability of the thermal radiation temperature that is 15.4 °C greater than that of a conventional TED with constant emissivity. This work aims to introduce a new design paradigm for future thermal radiation management and camouflage techniques.

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Realizing Sunlight‐Induced Efficiently Dynamic Infrared Emissivity Modulation Based on Aluminum‐Doped zinc Oxide Nanocrystals

Jia,

Liu,

Chen

et al. 2024

Advanced Science

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Dynamic manipulation of an object's infrared radiation characteristics is a burgeoning technology with significant implications for energy and information fields. However, exploring efficient stimulus–spectral response mechanism and realizing simple device structures remains a formidable challenge. Here, a novel dynamic infrared emissivity regulation mechanism is proposed by controlling the localized surface plasmon resonance absorption of aluminum‐doped zinc oxide (AZO) nanocrystals through ultraviolet photocharging/oxidative discharging. A straightforward device architecture that integrates an AZO nanocrystal film with an infrared reflective layer and a substrate, functioning as a photo‐induced dynamic infrared emissivity modulator, which can be triggered by weak ultraviolet light in sunlight, is engineered. The modulator exhibits emissivity regulation amount of 0.72 and 0.61 in the 3–5 and 8–13 µm ranges, respectively. Furthermore, the modulator demonstrates efficient light triggering characteristic, broad spectral range, angular‐independent emissivity, and long cyclic lifespan. The modulator allows for self‐adaptive daytime radiative cooling and nighttime heating depending on the ultraviolet light in sunlight and O2 in air, thereby achieving smart thermal management for buildings with zero‐energy expenditure. Moreover, the potential applications of this modulator can extend to rewritable infrared displays and deceptive infrared camouflage.

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Infrared Gasochromic Devices Based on Metal Thin Films

Cited by 4 publications

References 62 publications

Biological and Bioinspired Thermal Energy Regulation and Utilization

Biological and Bioinspired Thermal Energy Regulation and Utilization

Dynamic Infrared Radiation Regulator Enabling Positive and Reversible Modulation of Emissivity and Temperature

Realizing Sunlight‐Induced Efficiently Dynamic Infrared Emissivity Modulation Based on Aluminum‐Doped zinc Oxide Nanocrystals

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