Ultrathin Nanosheets of Half‐Metallic Monoclinic Vanadium Dioxide with a Thermally Induced Phase Transition

Yao, Takeshi; Liu, Liang; Xiao, Chong; Zhang, Xiaodong; Liu, Qinghua; Wei, Shiqiang; Xie, Yi

doi:10.1002/anie.201302891

Cited by 53 publications

(43 citation statements)

References 32 publications

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“…As VO 2 films approach nanoscale dimensions, various exotic phases have been predicted, such as half metallicity and semi-Dirac cones [60,61]. With the interface quality established and the surface well-characterized, we can now confidently study the effects of film thickness on the thermally-induced MIT.…”

Section: Resultsmentioning

confidence: 99%

X-Ray Spectroscopy of Ultra-Thin Oxide/Oxide Heteroepitaxial Films: A Case Study of Single-Nanometer VO2/TiO2

et al. 2015

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Epitaxial ultra-thin oxide films can support large percent level strains well beyond their bulk counterparts, thereby enabling strain-engineering in oxides that can tailor various phenomena. At these reduced dimensions (typically < 10 nm), contributions from the substrate can dwarf the signal from the epilayer, making it difficult to distinguish the properties of the epilayer from the bulk. This is especially true for oxide on oxide systems. Here, we have employed a combination of hard X-ray photoelectron spectroscopy (HAXPES) and angular soft X-ray absorption spectroscopy (XAS) to study epitaxial VO2/TiO2 (100) films ranging from 7.5 to 1 nm. We observe a low-temperature (300 K) insulating phase with evidence of vanadium-vanadium (V-V) dimers and a high-temperature (400 K) metallic phase absent of V-V dimers irrespective of film thickness. Our results confirm that the metal insulator transition can exist at atomic dimensions and that biaxial strain can still be used to control the temperature of its transition when the interfaces are atomically sharp. More generally, our case study highlights the benefits of using non-destructive XAS and HAXPES to extract out information regarding the interfacial quality of the epilayers and spectroscopic signatures associated with exotic phenomena at these dimensions.

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Section: Resultsmentioning

confidence: 99%

X-Ray Spectroscopy of Ultra-Thin Oxide/Oxide Heteroepitaxial Films: A Case Study of Single-Nanometer VO2/TiO2

et al. 2015

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“…To date, delamination or exfoliation is the most commonly developed approaches to prepare lamellar inorganic materials. However, it usually requires the modification of interlamellar environment and the appropriate selection of the solvent system, whereas it always takes over one week to get highly exfoliated nanosheets due to the tedious longterm aging and sonification process [8][9][10]. Moreover, the lateral scale of two-dimensional nanosheets prepared by chemical exfoliation is highly dependent on the pristine bulk materials used and the employed violent sonification would break the nanosheets into smaller pieces than the raw bulk materials itself.…”

Section: Introductionsmentioning

confidence: 99%

Template-free synthesis of ultra-large V2O5 nanosheets with exceptional small thickness for high-performance lithium-ion batteries

et al. 2015

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“…[32] Recently, it was also found that V 2 O 3 was one new intercalation-type high-capacity anode materials with a high capacity of LIBs (≈732 mA h g −1 ) based on the ex situ XRD technology, and it also exhibited the potential for anode materials of NIBs. ), [38,39] especially graphene-like 2D ultrathin nanomaterials which result in a wealth of unprecedented functionalities, [40,41] have exhibited a large superiority for LIBs. [34] Nanomaterials have shown huge advantages for various energy storage applications because of the ultra-large specific surface area and ultra-short diffusion path of ions/electrons.…”

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confidence: 99%

Recent Progress in the Applications of Vanadium‐Based Oxides on Energy Storage: from Low‐Dimensional Nanomaterials Synthesis to 3D Micro/Nano‐Structures and Free‐Standing Electrodes Fabrication

Liu

Zhu

Gao

et al. 2017

Advanced Energy Materials

167

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IntroductionWith the economic, science and technology increasing at an amazing speed, energy has become one of the most important issues in the 21 st century. In addition, the supply of fossil With revolutionary electric vehicles and the smart grid fast developing, more advanced energy storage technologies become quite crucial issues. Li-ion batteries (LIBs) and Na-ion batteries (NIBs) are considered as the most promising electrochemical energy storage technologies. Low-dimensional nano-structural electrode materials can greatly increase the specific capacity, but they still suffer from poor cycling and rate performances due to their serious self-aggregations. Constructing 3D structures, such as micro/ nano-structures and free-standing electrodes, is a quite promising method to address the above issues. Such 3D structures can simultaneously avoid the disadvantages of low-dimensional nanomaterials, and preserve their advantages. As one group of promising high-capacity and low-cost electrode materials, vanadium-based oxides have exhibited an quite attractive electrochemical performance for energy storage applications in many novel works. However, their systematic reviews are quite limited, which is disadvantageous to their further development. Herein, this article provides an overview of vanadium-based oxides in the applications of LIBs and NIBs by focusing mainly on the aspect from low-dimensional nanomaterials synthesis to 3D micro/nano-structures and free-standing electrodes fabrication. Moreover, a feasible strategy to controllably fabricate the 3D micro/nano-structure for the whole vanadium-based oxides family is presented. Furthermore, and importantly, a quite promising solution method for the practical commercialized applications of vanadium oxides cathode materials in the future is proposed, i.e., fabricating the "vanadium oxides-based cathode/solid electrolyte/Li metal anode-type" all solid-state secondary-ion batteries.

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Ultrathin Nanosheets of Half‐Metallic Monoclinic Vanadium Dioxide with a Thermally Induced Phase Transition

Cited by 53 publications

References 32 publications

X-Ray Spectroscopy of Ultra-Thin Oxide/Oxide Heteroepitaxial Films: A Case Study of Single-Nanometer VO2/TiO2

X-Ray Spectroscopy of Ultra-Thin Oxide/Oxide Heteroepitaxial Films: A Case Study of Single-Nanometer VO2/TiO2

Template-free synthesis of ultra-large V2O5 nanosheets with exceptional small thickness for high-performance lithium-ion batteries

Recent Progress in the Applications of Vanadium‐Based Oxides on Energy Storage: from Low‐Dimensional Nanomaterials Synthesis to 3D Micro/Nano‐Structures and Free‐Standing Electrodes Fabrication

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