Self-Assembled Multilayer Structure and Enhanced Thermochromic Performance of Spinodally Decomposed TiO<sub>2</sub>–VO<sub>2</sub> Thin Film

Sun, Guangming; Zhou, Huaijuan; Cao, Xun; Li, Rong; Tazawa, Masato; Okada, Masahisa; Jin, Ping

doi:10.1021/acsami.5b12476

Cited by 50 publications

(22 citation statements)

References 31 publications

(47 reference statements)

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“…However, in most case, the reduced τ c by doping is always gained at the expense of lower T lum and smaller Δ T sol . To overcome this trade‐off, many methods including nano‐thermochromic, porous films, photonic crystals structure, biomimetic surface reconstruction, co‐doping, gridded structure, and multilayered antireflective overcoating are developed. Compared with other approaches, nanothermochromic (the oval line marked in Figure a,b), which is to mix VO 2 nanoparticles with a glass or polymer matrix, has the optimum performance from both experiment data and theoretical results .…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Synthesis of VO₂ Polymorphs: Advantages, Challenges and Prospects for the Application of Energy Efficient Smart Windows

Magdassi

Gao

et al. 2017

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Vanadium dioxide (VO ) is a widely studied inorganic phase change material, which has a reversible phase transition from semiconducting monoclinic to metallic rutile phase at a critical temperature of τ ≈ 68 °C. The abrupt decrease of infrared transmittance in the metallic phase makes VO a potential candidate for thermochromic energy efficient windows to cut down building energy consumption. However, there are three long-standing issues that hindered its application in energy efficient windows: high τ , low luminous transmittance (T ), and undesirable solar modulation ability (ΔT ). Many approaches, including nano-thermochromism, porous films, biomimetic surface reconstruction, gridded structures, antireflective overcoatings, etc, have been proposed to tackle these issues. The first approach-nano-thermochromism-which is to integrate VO nanoparticles in a transparent matrix, outperforms the rest; while the thermochromic performance is determined by particle size, stoichiometry, and crystallinity. A hydrothermal method is the most common method to fabricate high-quality VO nanoparticles, and has its own advantages of large-scale synthesis and precise phase control of VO . This Review focuses on hydrothermal synthesis, physical properties of VO polymorphs, and their transformation to thermochromic VO (M), and discusses the advantages, challenges, and prospects of VO (M) in energy-efficient smart windows application.

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Section: Introductionmentioning

confidence: 99%

Hydrothermal Synthesis of VO₂ Polymorphs: Advantages, Challenges and Prospects for the Application of Energy Efficient Smart Windows

Magdassi

Gao

et al. 2017

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“…With respect to our magnetron sputtering technique, the fast quenching from high temperature is not suitable since both the substrates and the thin films could easily fracture upon quenching. Therefore, to ensure the composition stability and uniformity of amorphous films, we first propose a two-step approach, namely, the room temperature sputtering-annealing (RTS-A) approach in our TVO system 29 , the schematic diagram of which is presented in Fig. S1.…”

Section: Resultsmentioning

confidence: 99%

“…4(c)). The change is reasonable because the perpendicular orientation of the microscopic structure causes incomplete coverage of the V-rich layers on the substrate thus increases the total transmittance for the higher transparent property of Ti-rich layer 29 , and lowers the thermochromic functional area. SD-M displays relatively high thermochromic performance with T lum of 32.3% at 20 °C, 35.9% at 90 °C, ΔT sol of 6.6%, and ΔT 2000 nm of 51.9%.…”

Section: Resultsmentioning

confidence: 99%

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Multi-nanolayered VO2/Sapphire Thin Film via Spinodal Decomposition

Sun

Cao

Yue

et al. 2018

Sci Rep

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Coating of VO2-based thin film has been extensively studied for fabricating energy-saving smart windows. One of the most efficient ways for fabricating high performance films is to create multi-nanolayered structure. However, it has been highly challenge to make such layers in the VO2-based films using conventional methods. In this work, a facile two-step approach is established to fabricate multilayered VO2-TiO2 thin films. We first deposited the amorphous thin films upon sputtering, and then anneal them to transform the amorphous phase into alternating Ti- and V-rich multilayered nanostructure via a spinodal decomposition mechanism. In particular, we take advantage of different sapphire substrate planes (A-plane (11–20), R-plane (1–102), C-plane (0001), and M-plane (10-10)) to achieve different decomposition modes. The new approach has made it possible to tailoring the microstructure of the thin films for optimized performances by controlling the disorder-order transition in terms of both kinetic and thermodynamic aspects. The derived thin films exhibit superior optical modulation upon phase transition, significantly reduced transition temperature and hysteresis loop width, and high degradation resistance, these improvements indicate a high potential to be used for fabricating the next generation of energy saving smart windows.

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“…On the contrary, the material is a tetragonal structure (P4 2 / mnm,R), which is reflective for IR radiation [33,34]. This feature makes VO 2 an amazing material for thermochromic smart coatings [34][35][36][37][38][39][40][41][42].…”

Section: Introductionmentioning

confidence: 99%

Dual phase titanium alloy hot forging process design: experiments and numerical modeling

Ducato¹,

Buffa

Fratini³

et al. 2015

Adv. Manuf.

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With an urgent demand of energy efficient coatings for building fenestrations, vanadium dioxide (VO 2 )-based thermochromic smart coatings have been widely investigated due to the reversible phase transition of VO 2 at a critical transition temperature of 68°C, which is accompanied by the modulation of solar irradiation, especially in the near-infrared region. As for commercial applications in our daily life, there are still some obstacles for VO 2 -based smart coatings, such as the high phase transition temperature, optical properties (luminous transmittance and solar modulation ability), environmental stability in a long-time period, as well as mass production. In this review, recent progress of thermochromic smart coatings to solve above obstacles has been surveyed. Meanwhile, future development trends have also been given to promote the goal of commercial production of VO 2 smart coatings.

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Self-Assembled Multilayer Structure and Enhanced Thermochromic Performance of Spinodally Decomposed TiO₂–VO₂ Thin Film

Cited by 50 publications

References 31 publications

Hydrothermal Synthesis of VO₂ Polymorphs: Advantages, Challenges and Prospects for the Application of Energy Efficient Smart Windows

Hydrothermal Synthesis of VO₂ Polymorphs: Advantages, Challenges and Prospects for the Application of Energy Efficient Smart Windows

Multi-nanolayered VO2/Sapphire Thin Film via Spinodal Decomposition

Dual phase titanium alloy hot forging process design: experiments and numerical modeling

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Self-Assembled Multilayer Structure and Enhanced Thermochromic Performance of Spinodally Decomposed TiO2–VO2 Thin Film

Cited by 50 publications

References 31 publications

Hydrothermal Synthesis of VO2 Polymorphs: Advantages, Challenges and Prospects for the Application of Energy Efficient Smart Windows

Hydrothermal Synthesis of VO2 Polymorphs: Advantages, Challenges and Prospects for the Application of Energy Efficient Smart Windows

Multi-nanolayered VO2/Sapphire Thin Film via Spinodal Decomposition

Dual phase titanium alloy hot forging process design: experiments and numerical modeling

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Self-Assembled Multilayer Structure and Enhanced Thermochromic Performance of Spinodally Decomposed TiO₂–VO₂ Thin Film

Hydrothermal Synthesis of VO₂ Polymorphs: Advantages, Challenges and Prospects for the Application of Energy Efficient Smart Windows

Hydrothermal Synthesis of VO₂ Polymorphs: Advantages, Challenges and Prospects for the Application of Energy Efficient Smart Windows