VO2(M)@CeO2 core-shell nanospheres for thermochromic smart windows and photocatalytic applications

Saini, Meenu; Dehiya, Brijnandan S.; Umar, Ahmad

doi:10.1016/j.ceramint.2019.09.062

Cited by 38 publications

(19 citation statements)

References 53 publications

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“…In addition to SiO 2 , various types of oxides, such as ZnS [146], TiO 2 [11], and ZrO 2 [147], have been utilized for overcoating to prepare core-shell NPs. Saini et al demonstrated an approach to improve the thermal stability and thermochromic properties of VO 2 (M) NPs by overcoating with CeO 2 [148]. VO 2 (M)@CeO 2 NPs were observed to be thermally stable for up to 320 • C in air, which confirmed the enhancement in stability after overcoating.…”

Section: Fabrication Of Flexible Vo 2 (M) Films Through Solution-based Deposition Processmentioning

confidence: 96%

Recent Advances in Fabrication of Flexible, Thermochromic Vanadium Dioxide Films for Smart Windows

Kim¹,

Paik²

2021

Nanomaterials

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Monoclinic-phase VO2 (VO2(M)) has been extensively studied for use in energy-saving smart windows owing to its reversible insulator–metal transition property. At the critical temperature (Tc = 68 °C), the insulating VO2(M) (space group P21/c) is transformed into metallic rutile VO2 (VO2(R) space group P42/mnm). VO2(M) exhibits high transmittance in the near-infrared (NIR) wavelength; however, the NIR transmittance decreases significantly after phase transition into VO2(R) at a higher Tc, which obstructs the infrared radiation in the solar spectrum and aids in managing the indoor temperature without requiring an external power supply. Recently, the fabrication of flexible thermochromic VO2(M) thin films has also attracted considerable attention. These flexible films exhibit considerable potential for practical applications because they can be promptly applied to windows in existing buildings and easily integrated into curved surfaces, such as windshields and other automotive windows. Furthermore, flexible VO2(M) thin films fabricated on microscales are potentially applicable in optical actuators and switches. However, most of the existing fabrication methods of phase-pure VO2(M) thin films involve chamber-based deposition, which typically require a high-temperature deposition or calcination process. In this case, flexible polymer substrates cannot be used owing to the low-thermal-resistance condition in the process, which limits the utilization of flexible smart windows in several emerging applications. In this review, we focus on recent advances in the fabrication methods of flexible thermochromic VO2(M) thin films using vacuum deposition methods and solution-based processes and discuss the optical properties of these flexible VO2(M) thin films for potential applications in energy-saving smart windows and several other emerging technologies.

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Section: Fabrication Of Flexible Vo 2 (M) Films Through Solution-based Deposition Processmentioning

confidence: 96%

Recent Advances in Fabrication of Flexible, Thermochromic Vanadium Dioxide Films for Smart Windows

Kim¹,

Paik²

2021

Nanomaterials

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“…Coulombic efficiency can be calculated from the galvanostatic charging and discharging characteristics with eqn (6). 65…”

Section: Electrochemical Characterizationmentioning

confidence: 99%

“…Coulombic efficiency can be calculated from the galvanostatic charging and discharging characteristics with eqn (6). 65 where t d = discharging time, t c = charging time, All the GCD curves show symmetry of charging and discharging, which is an essential condition for an ideal capacitor. The Coulombic efficiency of PGV0.3 at a current density of 0.5 A g −1 was 122.4%.…”

Section: Electrochemical Characterizationmentioning

confidence: 99%

Prolific intercalation of VO₂ (D)/polypyrrole/g-C₃N₄ as an energy storing electrode with remarkable capacitance

et al. 2022

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“…1 ). Due to the reversible property changes, VO is suitable for switching applications such as memory storage 15 – 17 , smart windows 18 – 21 , infrared detection 22 or evasion 23 , photocatalysis 19 , 24 , thermal energy storage 25 , and radio-frequency modulation 26 , 27 . The remaining challenges facing the commercial implementation of VO include a complex or time-consuming synthesis, a relatively high , and an unresolved MIT mechanism.…”

Section: Introductionmentioning

confidence: 99%

Local structure elucidation of tungsten-substituted vanadium dioxide (V$$_{1-x}$$W$$_x$$O$$_2$$)

Wilson

Gibson

Cuillier

et al. 2022

Sci Rep

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Initially, vanadium dioxide seems to be an ideal first-order phase transition case study due to its deceptively simple structure and composition, but upon closer inspection there are nuances to the driving mechanism of the metal-insulator transition (MIT) that are still unexplained. In this study, a local structure analysis across a bulk powder tungsten-substitution series is utilized to tease out the nuances of this first-order phase transition. A comparison of the average structure to the local structure using synchrotron x-ray diffraction and total scattering pair-distribution function methods, respectively, is discussed as well as comparison to bright field transmission electron microscopy imaging through a similar temperature-series as the local structure characterization. Extended x-ray absorption fine structure fitting of thin film data across the substitution-series is also presented and compared to bulk. Machine learning technique, non-negative matrix factorization, is applied to analyze the total scattering data. The bulk MIT is probed through magnetic susceptibility as well as differential scanning calorimetry. The findings indicate the local transition temperature ($$T_c$$ T c ) is less than the average $$T_c$$ T c supporting the Peierls-Mott MIT mechanism, and demonstrate that in bulk powder and thin-films, increasing tungsten-substitution instigates local V-oxidation through the phase pathway VO$$_2\, \rightarrow$$ 2 → V$$_6$$ 6 O$$_{13} \, \rightarrow$$ 13 → V$$_2$$ 2 O$$_5$$ 5 .

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VO2(M)@CeO2 core-shell nanospheres for thermochromic smart windows and photocatalytic applications

Cited by 38 publications

References 53 publications

Recent Advances in Fabrication of Flexible, Thermochromic Vanadium Dioxide Films for Smart Windows

Recent Advances in Fabrication of Flexible, Thermochromic Vanadium Dioxide Films for Smart Windows

Prolific intercalation of VO₂ (D)/polypyrrole/g-C₃N₄ as an energy storing electrode with remarkable capacitance

Local structure elucidation of tungsten-substituted vanadium dioxide (V$$_{1-x}$$W$$_x$$O$$_2$$)

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VO2(M)@CeO2 core-shell nanospheres for thermochromic smart windows and photocatalytic applications

Cited by 38 publications

References 53 publications

Recent Advances in Fabrication of Flexible, Thermochromic Vanadium Dioxide Films for Smart Windows

Recent Advances in Fabrication of Flexible, Thermochromic Vanadium Dioxide Films for Smart Windows

Prolific intercalation of VO2 (D)/polypyrrole/g-C3N4 as an energy storing electrode with remarkable capacitance

Local structure elucidation of tungsten-substituted vanadium dioxide (V$$_{1-x}$$W$$_x$$O$$_2$$)

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Prolific intercalation of VO₂ (D)/polypyrrole/g-C₃N₄ as an energy storing electrode with remarkable capacitance