Insight into In Situ Amphiphilic Functionalization of Few‐Layered Transition Metal Dichalcogenide Nanosheets

Shen, Jianfeng; Wu, Jingjie; Wang, Man; Ge, Yuancai; Dong, Pei; Baines, Robert; Brunetto, Gustavo; Machado, Leonardo D.; Ajayan, Pulickel M.; Ye, Mingxin

doi:10.1002/adma.201602887

Cited by 16 publications

(16 citation statements)

References 51 publications

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“…To improve the stability, dispersibility and potential application in multiple fields, surface modification of 2D TMDCs are needed urgently. There are two kinds of surface modification methods (Figure 4), including physical adsorption ( Figure 5; Yong et al, 2014;Han et al, 2016;Dou et al, 2017) and chemical bonding ( Figure 6; Shen et al, 2016;Oudeng et al, 2018). Physical adsorption is mainly through the electrostatic attraction, hydrophobic interaction, and van der Waals force to achieve the surface modification of nanosheets.…”

Section: Surface Modificationmentioning

confidence: 99%

Two-Dimensional Transition Metal Dichalcogenides: Synthesis, Biomedical Applications and Biosafety Evaluation

Zhou

Sun

Bai

2020

Front. Bioeng. Biotechnol.

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Recently, two-dimensional transition metal dichalcogenides (2D TMDCs) have drawn certain attentions in many fields. The unique and diversified electronic structure and ultrathin sheet structure of 2D TMDCs offer opportunities for moving ahead of other 2D nanomaterials such as graphene and expanding the wide application of inorganic 2D nanomaterials in many fields. For a better understanding of 2D TMDCs, one needs to know methods for their synthesis and modification, as well as their potential applications and possible biological toxicity. Herein, we summarized the recent research progress of 2D TMDCs with particular focus on their biomedical applications and potential health risks. Firstly, two kinds of synthesis methods of 2D TMDCs, top-down and bottom-up, and methods for their surface functionalization are reviewed. Secondly, the applications of 2D TMDCs in the field of biomedicine, including drug loading, photothermal therapy, biological imaging and biosensor were summarized. After that, we presented the existing researches on biosafety evaluation of 2D TMDCs. At last, we discussed major research gap in current researches and challenges and coping strategies in future studies.

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Section: Surface Modificationmentioning

confidence: 99%

Two-Dimensional Transition Metal Dichalcogenides: Synthesis, Biomedical Applications and Biosafety Evaluation

Zhou

Sun

Bai

2020

Front. Bioeng. Biotechnol.

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“…Therefore, the Mo atoms at the S vacancies were exposed, which could function as the coordination centers to bond with ligands, as shown in Figure a. With this strategy, various kinds of building blocks that involved sulfur‐, oxygen‐, nitrogen‐containing functional groups were employed as ligands to coordinate with MoS 2 through S vacancies, resulting in multifunctional hybrid nanostructures …”

Section: Coordination‐driven Assembly Based On Tmdsmentioning

confidence: 99%

“…Similar to the S atoms, the O and N atoms also contained lone pair electrons. Therefore, molecules possessing O‐ and N‐containing functional groups could also coordinate with MoS 2 at the S vacancies, constructing various hybrid nanostructures …”

Section: Coordination‐driven Assembly Based On Tmdsmentioning

confidence: 99%

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Coordination‐Driven Hierarchical Assembly of Hybrid Nanostructures Based on 2D Materials

Liu

Zhong

Xie

2019

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nanobelts), 2D materials exhibit exceptional physical properties including large theoretical surface area, tunable electronic properties, high optical transparency, and excellent mechanical properties. [2] However, the strong re-stacking tendency of 2D materials caused by van der Waals interaction may result in serious loss of surface area, which inevitably weakens their unique properties. Besides, 2D materials always show intrinsic deficiencies for specific applications, despite the merits mentioned above. As a typical example, TMDs possess high theoretical specific capacities for lithium-ion storage but exhibit unsatisfied cyclability and rate capability in practice, because of their aggregation, low conductivity as well as huge volume expansion during lithium-ion insertion/extraction. [3] One effective way to solve these problems is to construct hybrid nanostructures based on 2D materials. [4][5][6][7][8] Hybrid nanostructures, as a class of composite materials, are composed of two or more nanostructured building blocks. [9,10] Hybrid nanostructures not only can energetically combine the intriguing merits and overwhelm the deficiencies of each building block, but also may generate new functions and properties. [3][4][5][6][7][8][11][12][13] These advantages make hybrid nanostructures based on 2D materials highly promising for practical applications with high performance. [14][15][16][17][18] Regarding the multicomponent composition of hybrid nanostructures, the interfacial interaction between the building blocks lays the foundation for structural and morphological stability, thereby influencing the functions and properties of the resulting hybrid nanostructures. [19][20][21][22] In this sense, the rational design and construction of reliable interfacial interaction for hybrid nanostructures are not only important for achieving improved performance, but also critical for understanding the fundamentals of structureproperty relationship.Generally, there are five types of interfacial interactions, i.e., covalent bond, coordination bond, hydrogen bond, π-π interaction, and electrostatic interaction. [19][20][21][22] Covalent bond and coordination bond are much stronger than the other three in terms of bond energy, so the former two are more favorable for constructing hybrid nanostructures with reliable interfacial interaction. [19] However, most 2D materials are chemically inert, which means the covalent modification is not suitable for them. Alternatively, there are coordination atoms in most of 2D materials and their derivatives, and hence coordination 2D materials have received tremendous scientific and engineering interest due to their remarkable properties and broad-ranging applications such as energy storage and conversion, catalysis, biomedicine, electronics, and so forth. To further enhance their performance and endow them with new functions, 2D materials are proposed to hybridize with other nanostructured building blocks, resulting in hybrid nanostructures with various morphologies and structures. The prop...

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“…Compared to mechanical exfoliation, chemical exfoliation is an alternative route to exfoliate bulk MX 2 into few‐ or monolayer sheets through a process of “intercalation–exfoliation”. There are two main strategies for chemically exfoliating layered MX 2 : liquid exfoliation and intercalation followed by exfoliation. Liquid exfoliation can be achieved by direct sonication of MX 2 in organic solvents (e.g., N ‐methyl pyrrolidinone (NMP) and dimethylformamide (DMF)) or surfactant solutions.…”

Section: Crystal Structures and Morphologies Of Tmdcsmentioning

confidence: 99%

Atomically Thin Transition‐Metal Dichalcogenides for Electrocatalysis and Energy Storage

et al. 2017

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their excellent physical and chemical properties. A large number of the layered materials are van der Waals heterostructures, which are composed from atomically thin layers in one-unit cells through van der Waals interactions. Compared to their bulk counterparts, atomically thin layered nanosheets tend to exhibit remarkable electronic and optical properties, outstanding mechanical flexibility, and exceptional catalytic performance. This is mainly attributed to the reduced dimensionality and quantum-confinement effect. [6] To date, the abovementioned 2D layered materials hold great promise for various applications, such as semiconductors, optoelectronics, photovoltaics, quantum dots, sensors, filtration, lightweight/strong composite materials, medicine, biological engineering, water purification, and energy conversion/ storage. As a representative of 2D layered inorganic materials, TMDCs have received a lot of attention because of their many unusual physical and chemical properties. Such kinds of compounds have a general chemical formula MX 2 (M = transition metal, X = chalcogen), and are bonded by strong intralayer bonding (covalent bonding) and weak interlayer bonding. [7] Each individual TMDC monolayer is composed of hexagonally packed M atoms sandwiched by two layers of X atoms. For MX 2 , the M is often from group IV of the periodic table and the X is commonly seen as S, Se, and Te. As expected, the various MX 2 have diverse electronic properties, including as insulators (e.g., HfS 2 ), semiconductors (e.g., MoS 2 and WS 2 ), semimetals (e.g., WTe 2 and TiSe 2 ), and true metals (e.g., NbS 2 and VSe 2 ). In addition to the preserved properties from their bulk counterparts, the reduced dimension of these materials into atomically thin layers (mono-or few-layers) gives them additional extraordinary characteristics. [7c,8] For example, the absence of interlayer interactions in monolayer MX 2 gives rise to a charge-carrier redistribution, as well as conversion from indirect bandgap to direct bandgap. [9] This is critically important for MX 2 to be applied in some areas, such as electronics and transistors. Moreover, atomically thin MX 2 are excellent host materials for ion insertion and ion transport, which are beneficial for developing high-performance electrodes for energy storage and conversion devices. [9a,10] Furthermore, the atoms at edges or grain boundaries with low coordination number in atomically thin Since the discovery of graphene in 2004, research on 2D materials has grown rapidly. Compared to their bulk counterparts, 2D atomically thin, layered transition-metal dichalcogenides (TMDCs or MX 2 ) nanosheets exhibit excellent electronic and optical properties, outstanding mechanical flexibility, and exceptional catalytic performance. As a representative of 2D materials, MX 2 holds great promise in many potential applications, especially in energyrelated applications. Here, a brief overview of atomically thin layered MX 2 nanosheets applied in energy storage and conversion systems is presented. Fi...

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Insight into In Situ Amphiphilic Functionalization of Few‐Layered Transition Metal Dichalcogenide Nanosheets

Cited by 16 publications

References 51 publications

Two-Dimensional Transition Metal Dichalcogenides: Synthesis, Biomedical Applications and Biosafety Evaluation

Two-Dimensional Transition Metal Dichalcogenides: Synthesis, Biomedical Applications and Biosafety Evaluation

Coordination‐Driven Hierarchical Assembly of Hybrid Nanostructures Based on 2D Materials

Atomically Thin Transition‐Metal Dichalcogenides for Electrocatalysis and Energy Storage

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