Preparation and characterization of a covalent edge-functionalized lipoic acid–MoS<sub>2</sub>conjugate

Jeong, Misoon; Kim, Somin; Ju, Sang Yong

doi:10.1039/c6ra00901h

Cited by 27 publications

(36 citation statements)

References 57 publications

(86 reference statements)

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“…[64] Similarly, other thiol-terminated ligands such as mercaptopropionic acid, 1-thioglycerol and L-cysteine were also chemically conjugated on the edges of MoS 2 and WS 2 nanosheets during their exfoliation process. [66] Recently, Lee's group reported the covalent binding of sulfur-containing groups on the surface sulfur vacancies of micromechanically exfoliated MoS 2 (Figure 4a), as indicated by the Raman spectral change of the surface-modified MoS 2 films (Figure 4b). [66] Recently, Lee's group reported the covalent binding of sulfur-containing groups on the surface sulfur vacancies of micromechanically exfoliated MoS 2 (Figure 4a), as indicated by the Raman spectral change of the surface-modified MoS 2 films (Figure 4b).…”

Section: Surface Modification With Organic Moleculesmentioning

confidence: 97%

Functionalized Hybridization of 2D Nanomaterials

Guan

Han

2019

Advanced Science

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The discovery of graphene and subsequent verification of its unique properties have aroused great research interest to exploit diversified graphene‐analogous 2D nanomaterials with fascinating physicochemical properties. Through either physical or chemical doping, linkage, adsorption, and hybridization with other functional species into or onto them, more novel/improved properties are readily created to extend/expand their functionalities and further achieve great performance. Here, various functionalized hybridizations by using different types of 2D nanomaterials are overviewed systematically with emphasis on their interaction formats (e.g., in‐plane or inter plane), synergistic properties, and enhanced applications. As the most intensely investigated 2D materials in the post‐graphene era, transition metal dichalcogenide nanosheets are comprehensively investigated through their element doping, physical/chemical functionalization, and nanohybridization. Meanwhile, representative hybrids with more types of nanosheets are also presented to understand their unique surface structures and address the special requirements for better applications. More excitingly, the van der Waals heterostructures of diverse 2D materials are specifically summarized to add more functionality or flexibility into 2D material systems. Finally, the current research status and faced challenges are discussed properly and several perspectives are elaborately given to accelerate the rational fabrication of varied and talented 2D hybrids.

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Section: Surface Modification With Organic Moleculesmentioning

confidence: 97%

Functionalized Hybridization of 2D Nanomaterials

Guan

Han

2019

Advanced Science

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“…Continued irradiation is expected to divide the 2D sheets into multiple 2D nanoparticles, as illustrated in the upper portion of Figure 1b. [19] After laser treatment, solutions were centrifuged for 10 min, and then the upper portion of the solution was extracted and drop cast onto a supporting substrate for characterization. While basal plane functionalization is also possible, the mechanism proposed here is consistent with preferential edge functionalization.…”

mentioning

confidence: 99%

“…While basal plane functionalization is also possible, the mechanism proposed here is consistent with preferential edge functionalization. [19] After laser treatment, solutions were centrifuged for 10 min, and then the upper portion of the solution was extracted and drop cast onto a supporting substrate for characterization.…”

mentioning

confidence: 99%

Simultaneous Fabrication and Functionalization of Nanoparticles of 2D Materials with Hybrid Optical Properties

Ibrahim

Irannejad

Wales

et al. 2018

Advanced Optical Materials

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biomedicine, [2,3] tribology, [4] photonics, [5] and electrocatalysis, [6] among others. Significant progress has been made recently in fabricating and functionalizing 2D nanosheets of transition metal dichalcogenides. [7] This progress has focused on the functionalization of mono-or few-layer nanosheets with lateral dimensions greater than 100 nm by combining chemical exfoliation, [8][9][10][11][12] micromechanical exfoliation, [13] or liquid exfoliation [14] with the reaction of functionalities. The formation and functionalization of smaller 2D nanoparticles or quantum dots, on the other hand, is still in its infancy.In what has been cited as the first direct evidence of covalent functionalization of a nanoscale transition metal dichalcogenide, Tuxen et al. produced MoS 2 monolayer nanoclusters in ultrahigh vacuum on a gold substrate and attached dibenzothiophene molecules to the clusters via controlled vapor exposure. [15,16] Beyond substrate-supported nanoclusters, the functionalization of nongraphene 2D nanoparticles suspended in solution was reported last year. Atkin et al. combined ultrasonication of WS 2 with microwave treatment in a citric acid-containing solution to produce monolayer WS 2 nanosheets ≈20-80 nm in diameter decorated with 2-5 nm carbon dots. [6] Jung et al. impinged BN flakes with super-heated nanoparticles then exposed them to water vapor to produce edge-hydroxylated BN quantum dots with 8 nm lateral size. [2] These techniques for fabricating and functionalizing 2D nanosheets and smaller nanoparticles are relatively slow (in some cases requiring several days), often require dangerous chemicals and elevated temperatures, and their demonstration has been material specific. In the case of functionalized 2D nanoparticles other than graphene, such as functionalized MoS 2 , WS 2 , and BN quantum dots, potentially exciting multifunctional optical properties have not been realized. The ability to produce a variety of hybrid 2D nanoparticles that possess the optical properties of both the host 2D material and functional groups would be extremely valuable for many of the aforementioned applications.We introduce a rapid femtosecond laser technique that simultaneously reduces the dimensions of flakes of 2D materials to a few nanometers and dissociates solvent molecules to bond with the edges of the freshly cleaved 2D sheets, in order to produce functionalized nanoparticles of 2D materials. Etha nol, a common and inexpensive solvent, is used to facilitate functionalization A general, rapid technique is introduced to simultaneously fabricate and functionalize nanoparticles of 2D materials. A femtosecond laser is used to irradiate flakes of 2D materials in an ethanol-containing solvent. The highly energetic laser pulses exfoliate and cleave the flakes into nanosheets with diameters of ≈3 nm and simultaneously dissociate the solvent molecules. The dissociated carbon and oxygen atoms bond with the freshly cleaved 2D nanoparticles to satisfy edge sites, resulting in the formation of hybrid 2D nanoparticles...

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“…After functionalization, MoS 2 NSs exhibited remarkably enhanced biocompatibility and colloidal stability in physiological conditions. Jeong et al functionalized 2H‐MoS 2 with LA via a simple sonochemical aqueous dispersion procedure . High resolution TEM (HRTEM) images showed that LA molecules attached to the edges of MoS 2 NSs and generated LA‐MoS 2 conjugates with intact crystalline basal planes.…”

Section: Surface Functionalization Of 2d Tmdc Nssmentioning

confidence: 99%

“…Jeong et al functionalized 2H-MoS 2 with LA via a simple sonochemical aqueous dispersion procedure. [113] High resolution TEM (HRTEM) images showed that LA molecules attached to the edges of MoS 2 NSs and generated LA-MoS 2 conjugates with intact crystalline basal planes. X-ray diffraction (XRD) patterns showed that the LA-MoS 2 conjugates formed randomly stacked trigonal prismatic 1H structure, suggesting that the functionalization did not alter the innate phase polytype of MoS 2 NSs.…”

Section: Coordinate Functionalizationmentioning

confidence: 99%

Recent Advances in Synthesis and Biomedical Applications of Two‐Dimensional Transition Metal Dichalcogenide Nanosheets

Shan

Zhang

et al. 2016

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During recent decades, a giant leap in the development of nanotechnology has been witnessed. Numerous nanomaterials with different dimensions and unprecedented features have been developed and provided unimaginably wide scope to solve the challenging problems in biomedicine, such as cancer diagnosis and therapy. Recently, two-dimensional (2D) transition metal dichalcogenide (TMDC) nanosheets (NSs), including MoS , WS , and etc., have emerged as novel inorganic graphene analogues and attracted tremendous attention due to their unique structures and distinctive properties, and opened up great opportunities for biomedical applications, including ultrasensitive biosensing, biological imaging, drug delivery, cancer therapy, and antibacterial treatment. A comprehensive overview of different synthetic methods of ultrathin 2D TMDC NSs and their state-of-the-art biomedical applications, especially those that have appeared in the past few years, is presented. At the end of this review, the future opportunities and challenges for 2D TMDC NSs in biomedicine are also discussed.

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Preparation and characterization of a covalent edge-functionalized lipoic acid–MoS₂conjugate

Abstract: Here, we developed a one-step method for covalent edge functionalization of semiconducting MoS2with lipoic acid.

Cited by 27 publications

References 57 publications

Functionalized Hybridization of 2D Nanomaterials

Functionalized Hybridization of 2D Nanomaterials

Simultaneous Fabrication and Functionalization of Nanoparticles of 2D Materials with Hybrid Optical Properties

Recent Advances in Synthesis and Biomedical Applications of Two‐Dimensional Transition Metal Dichalcogenide Nanosheets

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Preparation and characterization of a covalent edge-functionalized lipoic acid–MoS2conjugate

Abstract: Here, we developed a one-step method for covalent edge functionalization of semiconducting MoS2with lipoic acid.

Cited by 27 publications

References 57 publications

Functionalized Hybridization of 2D Nanomaterials

Functionalized Hybridization of 2D Nanomaterials

Simultaneous Fabrication and Functionalization of Nanoparticles of 2D Materials with Hybrid Optical Properties

Recent Advances in Synthesis and Biomedical Applications of Two‐Dimensional Transition Metal Dichalcogenide Nanosheets

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Preparation and characterization of a covalent edge-functionalized lipoic acid–MoS₂conjugate