Particle size, morphology and phase transitions in hydrothermally produced VO<sub>2</sub>(D)

Teixeira, Diana; Quesada-Cabrera, Raúl; Powell, Michael; Goh, Gregory K. L.; Sankar, Gopinathan; Parkin, Ivan P.; Palgrave, Robert G.

doi:10.1039/c7nj02165h

Cited by 27 publications

(11 citation statements)

References 31 publications

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“…It is monoclinic with space group P2/c , a = 4.597 Å, b = 5.684 Å, c = 4.913 Å, and β = 89.39° . An attempt to measure the Raman scattering from this phase led to the sample degradation and the formation of V 2 O 5 …”

Section: Vanadium Oxide Polymorphs: Structures and Raman Spectramentioning

confidence: 99%

A review of Raman spectroscopy of vanadium oxides

Shvets

Dikaya

Maksimova

et al. 2019

J Raman Spectroscopy

335

216

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This review summarizes Raman scattering data for different stable and metastable phases of vanadium oxides. We analyze literature data on crystal structures existing in the binary vanadium‐oxygen system. If available, we combine these data with experimental Raman spectra and relations of vibrational modes with the atomic arrangements and motions in crystals. Further, we employ arc sputtering to produce vanadium oxide films, including α and β‐vanadium, V14O6, VO, V2O3, V3O5, several phases of VO2, V6O13, V3O7, and V2O5, as confirmed by X‐ray diffraction analysis. All the films are studied using Raman spectroscopy: low‐ and high‐temperature V3O5 and VOx (1.67 < x < 2) are investigated for the first time. We demonstrate that a significant change in the V3O5 spectrum takes place along the phase transition occurring at approximately 140 °C. Moreover, we describe differences between the spectra of VO2 polymorphs produced without doping impurities, VO2 (M1), VO2 (M2), and VO2 (T). Finally, we analyze conflicting data on V7O16 and V3O7 and provide an explanation of the observed spectra. Overall, 21 spectra are identified for 53 known phases. Our work is aimed at laying the groundwork for easy identification of vanadium oxide phases in thin films, using Raman spectroscopy.

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Section: Vanadium Oxide Polymorphs: Structures and Raman Spectramentioning

confidence: 99%

A review of Raman spectroscopy of vanadium oxides

Shvets

Dikaya

Maksimova

et al. 2019

J Raman Spectroscopy

335

216

View full text Add to dashboard Cite

show abstract

“…46 VO 2 nanoparticles of ∼25, 32, and 45 nm do not show intersections in Figure 4f, benefiting from the sufficiently small VO 2 nanoparticles. 15 It is believed that the local surface plasmon resonance (LSPR) of the metallic R-phase VO 2 enhances visible light absorption if the particle size is small enough, 20,39 leading to a positive ΔT lum .…”

Section: Resultsmentioning

confidence: 99%

“…The oxygen partial pressure in autoclaves is normally set lower to prevent the formation of high-valence V 5+ ions. Therefore, oxygen-deficient VO 2 (M) is usually obtained. , …”

Section: Introductionmentioning

confidence: 99%

Size-Controllable M-Phase VO₂ Nanocrystals for Flexible Thermochromic Energy-Saving Windows

Chang

Wang

Zhao

et al. 2021

ACS Appl. Nano Mater.

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Ultrafine M-phase VO2 nanocrystals with good crystallinity are desirable for highly efficient thermochromic flexible films. Herein, we report an oxygen-controlled hydrothermal method to achieve the one-step preparation of stoichiometric and size-controllable VO2(M) nanoparticles for scaled-up production. The specific ratio of oxygen intake to V ions was first determined to guarantee the acquisition of stoichiometric VO2(M). Then, the hydrothermal conditions were optimized to perform size-controllable growth of VO2(M) nanoparticles. VO2(M) nanoparticles with average particle sizes of 25, 32, 41, and 52 nm were prepared by changing the precursor solution concentration under the determined oxygen intake/V ion ratio. Smaller VO2(M) nanoparticles exhibit better thermochromic performance because a smaller size favors light transmission and promotes blue-shifting of the local surface plasmon resonance. The flexible film fabricated with 25 nm VO2(M) nanoparticles shows an excellent thermochromic performance with a solar modulation efficiency (ΔT sol) of 19.2% and a luminous transmittance (T lum) up to 66.42%. This work proposes a simple and effective hydrothermal process producing size-controllable VO2(M) nanoparticles with low cost and scalable production and demonstrates that the size reduction of VO2(M) nanoparticles is favorable for flexible films to exhibit excellent thermochromic properties.

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“…This observed reduction in crystallite size is attributed to the increase in grain boundaries in the crystal structure [49,50]. On the other hand, the increase and decrease in the crystallite size of vanadium oxide nanostructures is explained by the phase transition in the vanadium oxide nanostructures [51].…”

Section: X-ray Diffractionmentioning

confidence: 95%

Microwave assisted growth of highly oriented vanadium oxides nanostructures: structural, vibrational and electrical properties

et al. 2021

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The proposed work focuses on the effects of growth time and annealing on the physico-chemical performance of vanadium oxides nanostructures (VO-NSs) films synthesized by a novel single reaction microwave synthesis. Thin films of VO-NSs were produced on glass substrates by varying the growth time and annealing temperature. Structural studies revealed that VO-NSs of synthesized films of VO 2 (B) + V 6 O 13 , VO 2 (B), V 3 O 7 and V 2 O 5 were crystallized in the form of monoclinic, monoclinic, tetragonal and orthorhombic structures with predominant orientation along ( 110), ( 110), ( 330) and ( 001) lattice plane, respectively. SEM analysis revealed that the VO-NSs thin films are dense and have uniform morphological characteristics. Furthermore, Raman spectroscopy show that all the samples undergo changes in intensities and peak positions that reflect changes in electronic structure and the vibrational properties. Our results demonstrate that the control of time and annealing treatment has a significant effect on the stoichiometry and the crystallinity leading to the control of the structure, size and morphology of VO-NSs. Moreover, the I-V curves were clearly linear and symmetrical with respect to both axes, with increasing the growth time and annealing treatment are two crucial parameters to improve the electrical conductivity, which influences the electrical properties and affects the behavior of the synthesized nanostructures. This synthesis approach offers a novel and simple route to produce one-dimensional nanostructured metal oxides, which are suitable for a wide range of applications, especially energy storage devices.

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Particle size, morphology and phase transitions in hydrothermally produced VO₂(D)

Abstract: An easy and reproducible method to synthesise thermochromic VO2[M] via VO2[D] at a low calcination temperature.

Cited by 27 publications

References 31 publications

A review of Raman spectroscopy of vanadium oxides

A review of Raman spectroscopy of vanadium oxides

Size-Controllable M-Phase VO₂ Nanocrystals for Flexible Thermochromic Energy-Saving Windows

Microwave assisted growth of highly oriented vanadium oxides nanostructures: structural, vibrational and electrical properties

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Particle size, morphology and phase transitions in hydrothermally produced VO2(D)

Abstract: An easy and reproducible method to synthesise thermochromic VO2[M] via VO2[D] at a low calcination temperature.

Cited by 27 publications

References 31 publications

A review of Raman spectroscopy of vanadium oxides

A review of Raman spectroscopy of vanadium oxides

Size-Controllable M-Phase VO2 Nanocrystals for Flexible Thermochromic Energy-Saving Windows

Microwave assisted growth of highly oriented vanadium oxides nanostructures: structural, vibrational and electrical properties

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Product

Resources

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Particle size, morphology and phase transitions in hydrothermally produced VO₂(D)

Size-Controllable M-Phase VO₂ Nanocrystals for Flexible Thermochromic Energy-Saving Windows