Cryo-mediated exfoliation and fracturing of layered materials into 2D quantum dots

Wang, Yan; Liu, Yang; Zhang, Jianfang; Wu, Jingjie; Xu, Hui; Wen, Xiewen; Zhang, Xiang; Yang, Wei; Vajtai, Róbert; Zhang, Yong; Chopra, Nitin; Odeh, Ihab N.; Wu, Yucheng; Ajayan, Pulickel M.

doi:10.1126/sciadv.1701500

Cited by 100 publications

(90 citation statements)

References 41 publications

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“…Compared to Sb 2 Te 3 , with higher interlayer distances and weaker interactions, there are not many exfoliation works reported too. High‐quality sheets of Sb and Sb 2 Te 3 have been obtained by epitaxial growth, mechanical and/or liquid‐phase exfoliation methods.…”

Section: Introductionmentioning

confidence: 99%

Towards Antimonene and 2D Antimony Telluride through Electrochemical Exfoliation

Marzo

Gusmão

Sofer

et al. 2020

Chemistry A European J

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Two-dimensional (2D) layered antimony (Sb) and antimony telluride (Sb 2 Te 3 )a re two valuable materials for optoelectronic devices and thermoelectric applications. Preparing high-quality sheets of thesem aterials is the initial phase to promotet heir expected issues. Herein, micrometer-sized few-to-multilayered sheetso fS ba nd Sb 2 Te 3 have been obtained by electrochemical exfoliation. The layered rhombo-hedralS bw as exfoliated in Na 2 SO 4 and Li 2 SO 4 electrolytes by anodic-cationic intercalation, and Sb 2 Te 3 was exfoliated in Na 2 SO 4 .T hese findings are important contributions for the solution-based room-temperature electrochemical exfoliation, whichi ss table under glove-box-free conditions, to further improve the productiono fh igh-quality exfoliated sheets. exfoliated switchingv oltage in 4and 10 min. In the insert the height profilesa long the x axis of some selected sheets.

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Section: Introductionmentioning

confidence: 99%

Towards Antimonene and 2D Antimony Telluride through Electrochemical Exfoliation

Marzo

Gusmão

Sofer

et al. 2020

Chemistry A European J

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“…Actually, when the size in either 1D/2D/3D is reduced to the nanolevel, the bandgap of the semiconductor will be markedly increased due to the quantum confinement effect . As there are so many uncertainties for simultaneously decreasing 3D sizes of the semiconductor for the photocatalytic reaction, 2D photocatalyst seems to be a middle ground. Compared with the bulk one, 2D semiconductor with a wider bandgap possesses a stronger redox capability and the more efficient transfer and separation of the photogenerated charge carriers due to the ultrathin 2D structure, which is very significant for improving the photocatalytic performance.…”

Section: Introductionmentioning

confidence: 99%

Accelerating Photogenerated Charge Kinetics via the Synergetic Utilization of 2D Semiconducting Structural Advantages and Noble‐Metal‐Free Schottky Junction Effect

She

et al. 2019

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holes and the reduction reaction from the photogenerated electrons. The redox capability of the semiconductor is determined by the band structure. The more positive valence band (VB) and more negative conduction band (CB) edges mean the stronger redox capability for the semiconductor, indicating that the wide-bandgap semiconductor possesses the stronger redox capability. [5] However, the wide-bandgap semiconductor can only be excited by the ultraviolet light, which counts against the utilization of solar energy due to a spot of the ultraviolet light (≈5%) in the solar spectrum. [5][6][7] Thus, the visible-light-driven photocatalyst should be more significant for the commercial application due to a great deal of the visible light (≈45%) in the solar spectrum. Thus, to a certain degree, the bandgap of the semiconductor should be increased for the stronger redox capability. Additionally, the photocatalytic reaction kinetics is also severely limited, resulting in low efficiency. [8] Thus, for the photocatalytic reaction, the photogenerated charge kinetics must be greatly accelerated so as to enable the photocatalysis to be applied commercially.To increase the bandgap of the visible-light-driven semiconducting photocatalyst as much as possible, decreasing 3D size of the semiconductor is an effective method for the nanomaterials. Actually, when the size in either 1D/2D/3D is reduced to the nanolevel, the bandgap of the semiconductor will be markedly increased due to the quantum confinement effect. [9][10][11] As there are so many uncertainties for simultaneously decreasing 3D sizes of the semiconductor for the photocatalytic reaction, [12] 2D photocatalyst seems to be a middle ground. Compared with the bulk one, 2D semiconductor with a wider bandgap possesses a stronger redox capability and the more efficient transfer and separation of the photogenerated charge carriers due to the ultrathin 2D structure, which is very significant for improving the photocatalytic performance. Thus, the 2D semiconducting photocatalyst is promising for the photocatalysis in practical application.Although 2D structure can limitedly accelerate photogenerated charge kinetics due to the effective transfer and separation of the photogenerated charge carriers, it is still Although photocatalysis is one of the most promising technologies for environmental and energy issues, the irreconcilable contradiction between the absorption of the visible light and the strong redox capability of the photocatalyst and the low photocatalytic reaction kinetics result in the poor efficiency. Here, a composite photocatalyst is reported with high redox capability and accelerated reaction kinetics synergistically utilizing 2D semiconducting structural advantages and the noble-metal-free Schottky junction effect. The 2D structure can not only increase the bandgap of the photocatalyst but also improve the transfer and separation of the photogenerated charge carriers. Furthermore, the introduction of the noblemetal-free Schottky junction effect accelerates the photoc...

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“…Notably, in our experiments, the exfoliation yields for TiTe 2 and WSe 2 reached to 80% and 91%, respectively, which is much higher than the yields 8% for MoS 2 by LPE exfoliation and compariable to the yield of 92% for MoS 2 by chemical exfoliation. [10,16] TMD nanosheets with the merits of multivalent oxidation states of transition metal ions, abundant 2D nanochannels, and good electrical conductivity, have drawn extensive attention for application on energy storage and conversion. [32] Among them, the TMD nanosheets featuring the 2D morphology nature enable the nanosheets to form film with robust flexibility that opens the opportunities for in-plane MSCs.…”

Section: (6 Of 8)mentioning

confidence: 99%

Solid Phase Exfoliation for Producing Dispersible Transition Metal Dichalcogenides Nanosheets

Zhang

Chen

Zhou

et al. 2020

Adv Funct Materials

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2D transition metal dichalcogenides (TMDs) nanosheets with unique electronic structure and vibrationally physical and chemical properties have triggered tremendous interest both in fundamental and applied research. In order to fully exploit the potential of these remarkable materials, general and efficient exfoliation methods for producing versatile kinds of TMDs are highly desired. Here, a universal solid phase exfoliation (SPE) strategy is developed with high productivity, feasibility, and repeatability for scalably preparing 18 kinds of MX 2 (M = Mo, W, V, Nb, Ta, Ti, X = Te, Se, S) nanosheets from corresponding cracked-induced bulk crystals (C-MX 2). By directly using C-MX 2 as the starting raw materials prepared by molten-salt cracking synthesis, it is more efficient and time-saving to produce thin nanosheets due to the loose interaction between layers compared with densely layered MX 2 (D-MX 2). Notably, the exfoliated TMD nanosheets can be easily processed as powders, water dispersions, and thin films, offering exciting opportunities for a wide range of applications from electronics to energy storage.

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Cryo-mediated exfoliation and fracturing of layered materials into 2D quantum dots

Abstract: We present a general approach to produce pristine 2D QDs directly from bulk layered materials in common solvents.

Cited by 100 publications

References 41 publications

Towards Antimonene and 2D Antimony Telluride through Electrochemical Exfoliation

Towards Antimonene and 2D Antimony Telluride through Electrochemical Exfoliation

Accelerating Photogenerated Charge Kinetics via the Synergetic Utilization of 2D Semiconducting Structural Advantages and Noble‐Metal‐Free Schottky Junction Effect

Solid Phase Exfoliation for Producing Dispersible Transition Metal Dichalcogenides Nanosheets

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