Microstructure control and property switching in stress-free van der Waals epitaxial VO2 films on mica

Ekström, Erik; Hurand, S.; Febvrier, Arnaud Le; Elsukova, Anna; Persson, Per O. Å.; Paul, Biplab; Eriksson, Fredrik; Sharma, Geetu; Voznyy, Oleksandr; Sangiovanni, Davide; Ramanath, Ganpati; Eklund, Per

doi:10.1016/j.matdes.2023.111864

Cited by 6 publications

(2 citation statements)

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“…In view of the strong chemical interaction between VO 2 and the substrate, which causes significant strain during MIT, they proposed van der Waals epitaxy as a tool to effectively alter the phase transition kinetics in VO 2 -like systems. Ekström et al further demonstrated van der Waals epitaxy of stress-free thin films of VO 2 nonlayered materials by using magnetron sputtering to grow VO 2 films on mica substrates. , Zhang et al used the differential scanning calorimetry (DSC) technique to study the transformation kinetics of tungsten-doped VO 2 nanoparticles . They combined the isoconversional kinetics with the classical nucleation kinetics model to reasonably explain the asymmetry of MIT in the heating and cooling stages caused by tungsten doping.…”

Section: Introductionmentioning

confidence: 99%

Phase Change Kinetics of Vanadium Dioxide Thin Film Prepared by Sol–Gel Deposition

Li,

Chang,

Xia

et al. 2024

J. Phys. Chem. C

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VO 2 is an attractive material for sustainable smart window applications due to its unique near-infrared light modulation capabilities; however, its energy efficiency is affected by its phase transition behavior of different forms. In this work, we first obtained high-quality VO 2 films by a facile sol−gel method followed by dip-coating and then thoroughly investigated the phase transition kinetics of the VO 2 thin films using an in situ XRD technique. Two phase transition kinetic models have been established and compared. The first based on the JMAK theory shows that, upon heating, monoclinic VO 2 started to transfer to rutile VO 2 phase transition at about 70 °C with an activation energy of 392.4 kJ/mol, and upon cooling the critical temperature dropped dramatically to about 45 °C with an activation energy of 126.0 kJ/mol, which is more suitable than the second model based on Kissinger's theory. This study enriched the existing theoretical systems of VO 2 phase transition kinetics, bridged the gap in understanding the thin film kinetics, and provided support for wide thermochromic applications in the future.

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Section: Introductionmentioning

confidence: 99%

Phase Change Kinetics of Vanadium Dioxide Thin Film Prepared by Sol–Gel Deposition

Li,

Chang,

Xia

et al. 2024

J. Phys. Chem. C

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“…Moreover, the color-coded inverse pole figure map along the out-of-plane Z direction (IPF- Z ) has a pure blue color, indicating that all of the nanoflakes take the [111] direction as the out-of-plane orientation. In addition, the IPF- Y of the nanoflakes takes the ⟨101⟩ crystal orientation (Figure S7), and these specific crystallographic orientations indicate the epitaxial growth of γ-Fe 2 O 3 on the surface of mica substrates. − Thanks to the naturally atomically flat surface and the absence of dangling bonds of mica, reactive atoms could efficiently migrate, dock, and crystallize at the interface connected by weak van der Waals interactions, ensuring the good orientation and high crystal quality of the nanoflakes. − …”

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confidence: 99%

Controlled Growth and Size-Dependent Magnetic Domain States of 2D γ-Fe₂O₃

Wang,

Fan,

Xue

et al. 2023

Nano Lett.

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Nonlayered two-dimensional (2D) magnets have attracted special attention, as many of them possess magnetic order above room temperature and enhanced chemical stability compared to most existing vdW magnets, which offers remarkable opportunities for developing compact spintronic devices. However, the growth of these materials is quite challenging due to the inherent three-dimensionally bonded nature, which hampers the study of their magnetism. Here, we demonstrate the controllable growth of air-stable pure γ-Fe2O3 nanoflakes by a confined-vdW epitaxial approach. The lateral size of the nanoflakes could be adjusted from hundreds of nanometers to tens of micrometers by precisely controlling the annealing time. Interestingly, a lateral-size-dependent magnetic domain configuration was observed. As the sizes continuously increase, the magnetic domain evolves from single domain to vortex and finally to multidomain. This work provides guidance for the controllable synthesis of 2D inverse spinel-type crystals and expands the range of magnetic vortex materials into magnetic semiconductors.

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Single‐Phase Growth, Stabilization, and Electrical Properties of B Phase VO₂ Films Grown on Mica by Reactive Magnetron Sputtering

Ekström

Hurand

Yildizhan

et al. 2023

Advanced Physics Research

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The VO2 metastable (B) phase is of interest for applications in temperature sensing, bolometry, and Li‐ion batteries. However, single‐phase growth of thin films of this metastable phase is a challenge because vanadium oxide exhibits many polymorphs and the VO2 stable (M1) phase is usually present as a secondary phase. Additionally, the phase transition at 350 °C in the (B) phase severely narrows the processing window for achieving phase‐pure films. Here, single‐phase growth of 5‐to 50‐nm thick VO2 (B) films on muscovite, mica, by pulsed direct‐current reactive magnetron sputtering at 400 °C is demonstrated. The films are phase‐pure and exhibit a high density of 4.05 g cm−3 and low resistivity of about 50 mΩcm at 30 °C. Increasing the film thickness to 100 nm results in a V2O5‐capped VO2 (B) film with a resistivity of 8000 mΩcm. These results indicate that the stability of the VO2 (B) phase is sensitive to in situ annealing during deposition. These findings should serve as a basis to design processes to exclusively obtain phase‐pure VO2 (B) films.

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Microstructure control and property switching in stress-free van der Waals epitaxial VO2 films on mica

Cited by 6 publications

References 53 publications

Phase Change Kinetics of Vanadium Dioxide Thin Film Prepared by Sol–Gel Deposition

Phase Change Kinetics of Vanadium Dioxide Thin Film Prepared by Sol–Gel Deposition

Controlled Growth and Size-Dependent Magnetic Domain States of 2D γ-Fe₂O₃

Single‐Phase Growth, Stabilization, and Electrical Properties of B Phase VO₂ Films Grown on Mica by Reactive Magnetron Sputtering

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Microstructure control and property switching in stress-free van der Waals epitaxial VO2 films on mica

Cited by 6 publications

References 53 publications

Phase Change Kinetics of Vanadium Dioxide Thin Film Prepared by Sol–Gel Deposition

Phase Change Kinetics of Vanadium Dioxide Thin Film Prepared by Sol–Gel Deposition

Controlled Growth and Size-Dependent Magnetic Domain States of 2D γ-Fe2O3

Single‐Phase Growth, Stabilization, and Electrical Properties of B Phase VO2 Films Grown on Mica by Reactive Magnetron Sputtering

Contact Info

Product

Resources

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Controlled Growth and Size-Dependent Magnetic Domain States of 2D γ-Fe₂O₃

Single‐Phase Growth, Stabilization, and Electrical Properties of B Phase VO₂ Films Grown on Mica by Reactive Magnetron Sputtering