Nanostructured VO2 thin films via cathodic deposition

Minch, Robert; Es‐Souni, M.

doi:10.1039/c3ce40848e

Cited by 14 publications

(9 citation statements)

References 18 publications

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“…3. In the spectral results, we were able to clearly assign the peak position at 142, 192, 223, 260, 309, 339, 389, 497, 613 cm −1 to V-O and V-V [54][55][56][57] characteristic vibration modes respectively that are both associated with the monoclinic phase, except the Si peak at 520 cm −1 which originated from the substrate. Following structural assessment of our samples, we carried out scanning electron microscope (SEM) analysis to visualize the morphological aspects.…”

Section: Experimental Methodsmentioning

confidence: 88%

Selective IR response of highly textured phase change VO₂ nanostructures obtained via oxidation of electron beam deposited metallic V films

Uslu¹,

Misirlioglu²,

Şendur³

2018

Opt. Mater. Express

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We demonstrate the growth of highly textured VO 2 nanocrystals via annealing of e-beam deposited amorphous metallic V. Temperature dependent ellipsometry results reveal the pronounced reflection near the IR spectrum above the transition and an almost temperature independent weak reflection in the visible spectrum. The IR reflection displays a strong hysteresis during heating and cooling near the transition temperature at 68°C, indicating a first order transition and a strain-free structure. Our work demonstrates the feasibility to obtain high quality phase change nanostructures that transmit the visible spectrum but reflect IR and is suitable for large scale fabrication.

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Section: Experimental Methodsmentioning

confidence: 88%

Selective IR response of highly textured phase change VO₂ nanostructures obtained via oxidation of electron beam deposited metallic V films

Uslu¹,

Misirlioglu²,

Şendur³

2018

Opt. Mater. Express

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“…Moreover, scaling VO 2 particles to nanoscale offers the possibility to further enhance its thermochromic performance at a moderate τ c . Several chemical and physical techniques have been reported to construct nanostructures of thermochromic VO 2 , including hydrothermal, magnetron sputtering, CVD, PVD, sol–gel, confined‐space combustion method, electrochemical and solution methods . Among them, vapor deposition is an efficient method for high quality VO 2 ‐film fabrication, but the equipment required for the film deposition is usually complex and expensive; a solution‐based deposition process is more cost effective, high‐yielding, and flexible, but it always suffers from multiple‐steps, lower purity, and small‐scale production .…”

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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185

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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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“…In both ways the glycerol will protect the a-VO 2 colloidsfrom agglomeration. [20,36,41,46,49,50] Figure 9s hows the temperature-dependent resistance of the 420 nm thick VO 2 (M) NP filmw ith an electrode distance of 1mm. No V 2 O 5 crystallites were found even after annealing at 350 8Cf or 5min.…”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, spin-coating of VO 2 (M) nanoparticles (NPs) is proven to be very simple method for fabricating VO 2 (M) thin films. [41] The preparationo fV O 2 (M) NPs with low cost and easy manipulation is still agreat challenge for practical applications. Hydrothermal methodsc an lead to VO 2 (M) NPs at al arger scale, but are highlyt ime and energy consuming, and usually need ah igh-temperature thermalt reatment under ac ontrolled atmosphere.…”

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confidence: 99%

Electrochemical Synthesis of Amorphous VO₂ Colloids and Their Rapid Thermal Transforming to VO₂(M) Nanoparticles with Good Thermochromic Performance

Zhong

et al. 2016

Chemistry A European J

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Amorphous VO (a-VO ) colloids were synthesized by electrochemical anodic oxidation of metallic vanadium. It was found that the a-VO colloids have a cotton-like morphology composed of very small clusters, and that the crystallization temperature of the a-VO colloids can be adjusted either by the electrolyte of the anodic oxidation or/and the dispersion agent of the colloids. VO (M) nanoparticles (NPs) (and a NP film) with an average size of about 50 nm can be obtained by a rapid thermal annealing of the a-VO colloids at 310 °C under air, which is beneficial for practical applications. The VO (M) NP film shows an obvious metal-semiconductor transition with a resistance less than 10 Ω in the metallic state. An integral visible transmittance of 40.7 %, a solar transmittance modulation of 9.4 %, and a resistance modulation in the order of 5×10 were realized in the VO (M) NP film.

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Nanostructured VO2 thin films via cathodic deposition

Cited by 14 publications

References 18 publications

Selective IR response of highly textured phase change VO₂ nanostructures obtained via oxidation of electron beam deposited metallic V films

Selective IR response of highly textured phase change VO₂ nanostructures obtained via oxidation of electron beam deposited metallic V films

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

Electrochemical Synthesis of Amorphous VO₂ Colloids and Their Rapid Thermal Transforming to VO₂(M) Nanoparticles with Good Thermochromic Performance

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Nanostructured VO2 thin films via cathodic deposition

Cited by 14 publications

References 18 publications

Selective IR response of highly textured phase change VO2 nanostructures obtained via oxidation of electron beam deposited metallic V films

Selective IR response of highly textured phase change VO2 nanostructures obtained via oxidation of electron beam deposited metallic V films

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

Electrochemical Synthesis of Amorphous VO2 Colloids and Their Rapid Thermal Transforming to VO2(M) Nanoparticles with Good Thermochromic Performance

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Selective IR response of highly textured phase change VO₂ nanostructures obtained via oxidation of electron beam deposited metallic V films

Selective IR response of highly textured phase change VO₂ nanostructures obtained via oxidation of electron beam deposited metallic V films

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

Electrochemical Synthesis of Amorphous VO₂ Colloids and Their Rapid Thermal Transforming to VO₂(M) Nanoparticles with Good Thermochromic Performance