One‐Step Simultaneous Exfoliation and Covalent Functionalization of MoS<sub>2</sub> by Amino Acid Induced Solution Processes

Satheeshkumar, Elumalai; Bandyopadhyay, Arkamita; Sreedhara, M. B.; Pati, Swapan K.; Rao, C. N. R.; Yoshimura, Masahiro

doi:10.1002/cnma.201600363

Cited by 36 publications

(23 citation statements)

References 44 publications

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“…The colloidal Phe@ d ‐Ti 3 C 2 T x showed an absorption band at 219 nm, which is indicative of the chemisorbed Phe on Ti 3 C 2 T x surface. This transition is due to the combination of π–π* transitions in the benzene ring of Phe and intramolecular charge‐transfer transitions from the benzene ring to the protonated carbonyl group . All of these absorption bands were verified by the UV‐Vis spectra of aqueous AA solutions (Supporting Information, Figure S1).…”

Section: Figurementioning

confidence: 66%

“…The concentration of His@ d ‐Ti 3 C 2 T x was found to be ≈0.05 g L −1 by the vacuum freeze‐dry method. [18] The absorption bands of functionalized AAs on exfoliated transition metal dichalcogenides (TMDs) in aqueous dispersions typically appear in the UV region between 220 to 300 nm due to the π–π* transition in the phenyl and imidazole rings . However, the UV‐Vis spectra of the His@ d ‐Ti 3 C 2 T x colloidal solution did not show AA absorption bands, because d ‐Ti 3 C 2 T x also exhibits very high broad absorption in the UV region within the range of 220–325 nm.…”

Section: Figurementioning

confidence: 99%

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Simultaneous Delamination and Rutile Formation on the Surface of Ti₃C₂T_x MXene for Copper Adsorption

Satheeshkumar

Yoshimura²,

Ogawa

2020

Chemistry An Asian Journal

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In this work, we studied the formation of the rutile phase of titanium dioxide (TiO2) on delaminated MXene (d‐Ti3C2Tx) flakes by the reaction of Ti3C2Tx with amino acids in water. Three types of amino acids with varied side‐chain polarity were used to delaminate Ti3C2Tx. d‐Ti3C2Tx flakes formed stable colloidal solutions due to the negative surface charges of chemisorbed amino acids on the d‐Ti3C2Tx. Rutile formed on d‐Ti3C2Tx at room temperature upon the intercalation of aromatic amino acids and subsequent sonication of the solution, while flakes intercalated with aliphatic amino acids did not oxidize. X‐Ray diffraction (XRD), transmission electron microscopy (TEM) and Raman spectroscopy revealed the nanosize rutile formation on the surface of Ti3C2Tx flakes. The XPS results indicated the surface functionalization of histidine on d‐Ti3C2Tx flakes. As‐synthesized histidine functionalized rutile TiO2@d‐Ti3C2Tx hybrid was used for adsorption of Cu2+ ions from aqueous solution with a maximum uptake of 95 mg g−1.

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Section: Figurementioning

confidence: 66%

Section: Figurementioning

confidence: 99%

Simultaneous Delamination and Rutile Formation on the Surface of Ti₃C₂T_x MXene for Copper Adsorption

Satheeshkumar

Yoshimura²,

Ogawa

2020

Chemistry An Asian Journal

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“…

biomedicine, [2,3] tribology, [4] photonics, [5] and electrocatalysis, [6] among others. [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. [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.

…”

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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“…Such functionalization can endow these 2D TMDC nanomaterials with high stability under physiological conditions, which is very essential for further applications in biological systems . Over the past years, a variety of ionic surfactants, polymers, and biomolecules have been successfully employed to assist the exfoliation of TMDCs.…”

Section: Solution‐based Synthesis Of Tmdcsmentioning

confidence: 99%

“…In a typical experiment, TGA could not only exfoliate bulk MoS 2 and modify the surface of MoS 2 via thiol chemistry with carboxylic acid end groups to improve the dispersion of the MoS 2 monolayer in water, but could also subsequently synthesize water‐soluble MoS 2 QDs with sustained fluorescence emission, which could be utilized as cell biomarkers and in some other biomedical applications. In 2017, an amino‐acid‐induced solution‐processed simultaneous exfoliation and in situ covalent functionalization of MoS 2 were proposed by Satheeshkumar et al who found that the N‐terminal binding (NH 2 ) of amino acids is much more favorable than the C‐terminal binding (carboxylic acid) to the sulfur defects on exfoliated MoS 2 . The functionalized MoS 2 flakes through this simple nontoxic method exhibited excellent biocompatibility, and it can be envisioned that other MX 2 compounds of TMDCs may be also exfoliated and functionalized by this method.…”

Section: Functionalization Of Tmdcmentioning

confidence: 99%

Design, Synthesis, and Surface Modification of Materials Based on Transition‐Metal Dichalcogenides for Biomedical Applications

et al. 2017

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With the rapid development of nanotechnology, the emerging transition‐metal dichalcogenides (TMDCs) have become one of the most promising inorganic nanomaterials for medical applications due to their distinctive structures and properties. TMDCs with different sizes and morphologies exhibit unique structural advantages, as well as versatile properties. However, concerning their practicability for biomedical applications, routes toward their synthesis and chemical/physical functionalization for biosystem applications must be identified. Herein, recent advances in the design, synthesis, and surface modification of TMDC‐based nanomaterials specific for biomedical applications are reviewed. First, the basic consideration regarding how to fabricate biocompatible TMDCs efficiently for biomedical use is discussed. Solution‐based synthesis methods for 2D TMDCs, as well as TMDC‐based nanocomposites are then summarized. In addition, general strategies applied for surface functionalization of TMDCs are also discussed. Finally, current challenges and future perspectives for these promising materials in biosystem applications are outlined.

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One‐Step Simultaneous Exfoliation and Covalent Functionalization of MoS₂ by Amino Acid Induced Solution Processes

Cited by 36 publications

References 44 publications

Simultaneous Delamination and Rutile Formation on the Surface of Ti₃C₂T_x MXene for Copper Adsorption

Simultaneous Delamination and Rutile Formation on the Surface of Ti₃C₂T_x MXene for Copper Adsorption

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

Design, Synthesis, and Surface Modification of Materials Based on Transition‐Metal Dichalcogenides for Biomedical Applications

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One‐Step Simultaneous Exfoliation and Covalent Functionalization of MoS2 by Amino Acid Induced Solution Processes

Cited by 36 publications

References 44 publications

Simultaneous Delamination and Rutile Formation on the Surface of Ti3C2Tx MXene for Copper Adsorption

Simultaneous Delamination and Rutile Formation on the Surface of Ti3C2Tx MXene for Copper Adsorption

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

Design, Synthesis, and Surface Modification of Materials Based on Transition‐Metal Dichalcogenides for Biomedical Applications

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One‐Step Simultaneous Exfoliation and Covalent Functionalization of MoS₂ by Amino Acid Induced Solution Processes

Simultaneous Delamination and Rutile Formation on the Surface of Ti₃C₂T_x MXene for Copper Adsorption

Simultaneous Delamination and Rutile Formation on the Surface of Ti₃C₂T_x MXene for Copper Adsorption