Thermal aging effect of vanadyl acetylacetonate precursor for deposition of VO2 thin films with thermochromic properties

Yu, Jonghan; Nam, Sang-Hun; Kim, Donguk; Kim, Minha; Seo, Heejin; Ro, Yu Hyeon; Joo, Yong Tae; Lee, Jaehyeong; Boo, Jin‐Hyo

doi:10.1016/j.materresbull.2016.01.051

Cited by 9 publications

(4 citation statements)

References 27 publications

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“…This was stirred for 2 h at 45 °C in an air atmosphere by a magnetic stirrer with a rotation of 350 rpm, resulting in a solution that was blackish green. This solution was visibly stable for up to 15 days of aging (Figure S1), which is much better compared to the previously reported precursor solutions. , …”

Section: Experimental Detailsmentioning

confidence: 51%

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Synthesis of Self-Assembled Randomly Oriented VO₂ Nanowires on a Glass Substrate by a Spin Coating Method

et al. 2020

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Randomly oriented vanadium dioxide (VO 2 ) nanowires were produced on a glass substrate by spin coating from a cosolvent. SEM studies reveal that highly dense VO 2 nanowires were grown at an annealing temperature of 400 °C. X-ray diffraction (XRD) provides evidence of the high crystallinity of the VO 2 nanowires-embedded VO 2 thin films on the glass substrate at 400 °C. Characterization by high-resolution transmission electron microscopy (HR-TEM) confirmed the formation of VO 2 nanowires. The optical band gap of the nanowires-embedded VO 2 thin films was also calculated from the transmittance data to be 2.65− 2.70 eV. The growth mechanism of the solution-processed semiconducting VO 2 nanowires was proposed based on both solvent selection and annealing temperature. Finally, the solar water splitting ability of the VO 2 nanowires-embedded VO 2 thin films was demonstrated in a photoelectrochemical cell (PEC).

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Section: Experimental Detailsmentioning

confidence: 51%

“…This solution was visibly stable for up to 15 days of aging (Figure S1), which is much better compared to the previously reported precursor solutions. 27,31 2.2. Preparation of VO 2 Nanowires.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Self-Assembled Randomly Oriented VO₂ Nanowires on a Glass Substrate by a Spin Coating Method

et al. 2020

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“…The peaks at 205, 220, 277, and 307 nm correspond to the transitions by π → π* (VO(acac) 2 ), n → π* (nitrate in AN), π → π* (H(acac)), and n → π* (VO(acac) 2 ), respectively (see Table S2). − After the DUV irradiation under nitrogen gas flow, it was observed that the overall absorption in the AN-free VO(acac) 2 film was reduced by 15 to 38% due to the DUV-driven photochemical degradation of acetylacetonate residues in the as-deposited VO 2 film (Figure d). ,,, Interestingly, the same DUV irradiation but with the presence of AN in the VO 2 film induces more pronounced reduction in the UV–visible absorption spectra by 47 to 67% (Figure e). This can be attributed to the more effective removal of organic residues such as acetylacetonate from VO(acac) 2 with the aid of OH and NO 2 radicals which are generated in situ from ammonium nitrate by DUV absorption .…”

Section: Results and Discussionmentioning

confidence: 97%

In Situ Tracking of Low-Temperature VO₂ Crystallization via Photocombustion and Characterization of Phase-Transition Reliability on Large-Area Flexible Substrates

Lee

Yoon

et al. 2020

Chem. Mater.

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Low-temperature processing methods targetting for sol−gel metal oxides have been limited to amorphous metal oxide films because a much higher energy budget is required for crystalline functional metal oxide formation. Herein, we report the photocombustion developed to dramatically reduce the crystallization temperature of a sol−gel VO 2 film from 600 to 250 °C by combining deep ultraviolet irradiation with a carbon-free oxidizer for reactive radical generation. The morphological transition and crystal evolution of the sol−gel films annealed via various conditions including combustion, photoactivation, and photocombustion were thoroughly investigated using in situ and ex situ TEM techniques, allowing us to separate the regimes of amorphous and crystal solid formation. TGA-DTA, UV−vis spectroscopy, and EDX analyses reveal that, at [AN]/[VO(acac) 2 ] of 1.5, impurity removal and V−O−V polycondensation are most effective and suggest that oxygen vacancies generated during reduction play a key role in accelerating crystallization. Functional VO 2 films were successfully deposited on polyimide substrates for large-area flexible phase-transition device arrays, while their excellent uniformity and phasetransition reliability were confirmed under various bending conditions. We believe that the low-temperature crystallization via DUVassisted photocombustion is useful for strain-sensitive low temperature devices of crystalline metal oxide films fabricated via sol−gel routes.

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“…5 (d)). The reference sample showed the typical packed nanoparticle morphology of crystalline solution-based VO 2 [67,68].…”

Section: Laser-thin Film Interactionmentioning

confidence: 99%

Rapid Laser-Induced Low Temperature Crystallization of Thermochromic Vo2 Sol-Gel Thin Films

Basso¹,

Colusso²,

Carraro³

et al. 2023

Preprint

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Thermal aging effect of vanadyl acetylacetonate precursor for deposition of VO2 thin films with thermochromic properties

Cited by 9 publications

References 27 publications

Synthesis of Self-Assembled Randomly Oriented VO₂ Nanowires on a Glass Substrate by a Spin Coating Method

Synthesis of Self-Assembled Randomly Oriented VO₂ Nanowires on a Glass Substrate by a Spin Coating Method

In Situ Tracking of Low-Temperature VO₂ Crystallization via Photocombustion and Characterization of Phase-Transition Reliability on Large-Area Flexible Substrates

Rapid Laser-Induced Low Temperature Crystallization of Thermochromic Vo2 Sol-Gel Thin Films

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Thermal aging effect of vanadyl acetylacetonate precursor for deposition of VO2 thin films with thermochromic properties

Cited by 9 publications

References 27 publications

Synthesis of Self-Assembled Randomly Oriented VO2 Nanowires on a Glass Substrate by a Spin Coating Method

Synthesis of Self-Assembled Randomly Oriented VO2 Nanowires on a Glass Substrate by a Spin Coating Method

In Situ Tracking of Low-Temperature VO2 Crystallization via Photocombustion and Characterization of Phase-Transition Reliability on Large-Area Flexible Substrates

Rapid Laser-Induced Low Temperature Crystallization of Thermochromic Vo2 Sol-Gel Thin Films

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Product

Resources

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Synthesis of Self-Assembled Randomly Oriented VO₂ Nanowires on a Glass Substrate by a Spin Coating Method

Synthesis of Self-Assembled Randomly Oriented VO₂ Nanowires on a Glass Substrate by a Spin Coating Method

In Situ Tracking of Low-Temperature VO₂ Crystallization via Photocombustion and Characterization of Phase-Transition Reliability on Large-Area Flexible Substrates