Single-layer dispersions of transition metal dichalcogenides in the synthesis of intercalation compounds

Golub, A. S.; Zubavichus, Yan V.; Slovokhotov, Yurii L.; Novikov, Yu. N.

doi:10.1070/rc2003v072n02abeh000789

Cited by 66 publications

(46 citation statements)

References 129 publications

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“…Transition-metal chalcogenides (TMC) possessing lamellar structures can serve as hosts for the intercalation of a wide variety of electron-donating species ranging from Lewis base to alkali metals 24,25 . One well-known class of intercalatants is the organolithium compounds.…”

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confidence: 99%

High yield exfoliation of two-dimensional chalcogenides using sodium naphthalenide

et al. 2014

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Transition-metal dichalcogenides like molybdenum disulphide have attracted great interest as two-dimensional materials beyond graphene due to their unique electronic and optical properties. Solution-phase processes can be a viable method for producing printable singlelayer chalcogenides. Molybdenum disulphide can be exfoliated into monolayer flakes using organolithium reduction chemistry; unfortunately, the method is hampered by low yield, submicron flake size and long lithiation time. Here we report a high-yield exfoliation process using lithium, potassium and sodium naphthalenide where an intermediate ternary Li x MX n crystalline phase (X ¼ selenium, sulphur, and so on) is produced. Using a two-step expansion and intercalation method, we produce high-quality single-layer molybdenum disulphide sheets with unprecedentedly large flake size, that is up to 400 mm 2 . Single-layer dichalcogenide inks prepared by this method may be directly inkjet-printed on a wide range of substrates.

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confidence: 99%

High yield exfoliation of two-dimensional chalcogenides using sodium naphthalenide

et al. 2014

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“…The Cu atoms somewhat shift from the centers of the tetrahedra, so that the nearest environment becomes irregular. 5 In Ag 0.61 МоS 2 the Ag atom has a strongly distorted tetrahe dral environment. 5 Hence, it can be assumed that the com pounds studied contain several types of sulfur atoms that differently interact with guest atoms.…”

Section: Resultsmentioning

confidence: 99%

“…5 In Ag 0.61 МоS 2 the Ag atom has a strongly distorted tetrahe dral environment. 5 Hence, it can be assumed that the com pounds studied contain several types of sulfur atoms that differently interact with guest atoms. Therefore, when an alyzing the experimental values of the chemical shift of the inner 2p 3/2,1/2 lines of sulfur in the studied series of com I I I I I pounds, one should take into account the presence of at least two types of sulfur atoms: atoms S I that directly coor dinate to guest atoms and atoms S II that are not in the direct contact with intercalated atoms or molecules.…”

Section: Resultsmentioning

confidence: 99%

Electronic structure of intercalation compounds of molybdenum disulfide MMoS2 (M = Cu, Ag) studied by X-ray emission and X-ray photoelectron spectroscopies

et al. 2008

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Electronic structures of intercalation compounds of molybdenum disulfide in which the MoS 2 layers alternate with layers formed by the metal atoms (Cu, Ag) were studied by X ray emission and photoelectron spectroscopies. The character of participation of these or other valence states of atoms in the construction of occupied and unoccupied energy bands of the substances studied was considered on the basis of the X ray spectra of various series.Key words: molybdenum disulfide, intercalation compounds, X ray emission spectroscopy, X ray photoelectron spectroscopy.Metal dichalcogenides МХ 2 (X = S, Se) are presently studied intensely as objects of fundamental research on the physical and chemical properties of low dimensional com pounds. 1 Transition metal dichalcogenides find practical use as materials for solid state current sources, lubricants with good antifriction properties, and components of com posite materials of heterophase systems of various distina tion. 2 Metal dichalcogenides are widely used as catalysts in petrochemical industry. 3 It has been found recently that multilayer polyhedral structures resembling carbon "on ions" and nanotubes can be obtained from transition metal dichalcogenides. 4 Molybdenum disulfide. Molybdenum disulfide (MoS 2 ) is the most frequently used object of investigation in the series of 4d transition metal dichalcogenides. The elec tronic structure of this compound is widely studied. 5-10 The band structure of molybdenum dichalcogenide is de termined by the interaction of 4d atomic orbitals (AOs) of molybdenum and 3s , 3p AOs of sulfur.The first X ray studies of the electronic structure of МоS 2 gave 11 the X ray emission spectra of Мо L β2,15 (N IV,V →L III ) and Mo L III absorption edge (transition 2p-4d, nd). The X ray emission spectra of Mo L β2,15 , Mo L β3 (M III →L I ), Mo L β4 (M II →L I ), Mo L β6 (N I →L III ), S L 2,3 (M I →L II,III ), and S K β1,3 (M II,III →K) in МоS 2 were studied. 12-14 The absorption spectra of Mo L III were studied more recently. 7, 15 The emission and absorption spectra were considered 11 in terms of the quasi atomic model, according to which selective lines that appear in X ray emission and absorp tion spectra characterize the participation of electrons in the quasi atomic hybrid states of molybdenum (d 4 sp hy bridization). The character of hybridization of the central metal atom is determined by the nearest environment of the molybdenum atom. The spectra obtained exhi bited considerable overlapping of the emission L β2,15 band and the band of the L III absorption edge of molybde num. The fluorescence Mo L β2,15 spectrum was not ob tained 11 because of the low intensity of the correspond ing line.In the next step of X ray spectral studies of МоS 2 , the emission Mo L β2,15 , Mo L γ1 , S L 2,3 , and S K β spectra were investigated 13,14 in molybdenite and the spectra were aligned on a common energy scale. The spectra were ob tained by the fluorescence method, which allowed the di rect interaction of the substance studied with the electron bea...

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“…As the methods of obtaining of nanocomposites will be analyzed, some other inorganic materials will be also discussed, among them the abovementioned phosphorus-molybdenum acid H 3 xÀ -alkali metal-hydroxide-anion [83] give a possibility of their modifying by various cations, including formation of layered compounds with the cations of quarter alkyl ammonium, etc. [84].…”

Section: Composition Structure and Intercalation Properties Of Layementioning

confidence: 99%

Physical Chemistry of Intercalated System

Pomogailo

Джардималиева

2014

Nanostructured Materials Preparation via Condensation Ways

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The driving force of development of intercalation chemistry is significant improvement of properties of fabricated nanocomposites and design of materials with new properties. Forming hybrid structures (sometimes called "ship-in-the-bottle") define important functional characteristics: improved mechanical strength (increase in modulus), enhanced stiffness, heat resistance (decrease in thermal expansion coefficient), heat stability, and other thermal physical properties, water resistance, interesting barrier properties for gas separation, high flame and fire resistance, electric and electrochemical behavior, size stability, chemical stability, different from the simple additive properties [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20].Hybrid-phase nanocomposites [21] are not only of academic, but of commercial interest, because they posses improved mechanical and thermal properties as compared with the same content of conventional fillers (such as carbon soot or deposited silica gel). The methods of production of hybrid nanocomposites from polymer solutions or polymerization in situ in combination with delamination and exfoliation were already studied at the end of the last century (for example, [22,23]). However, there were technological drawbacks: these methods had low correlation with polymer production and demanded great amounts of organic solvents. At the beginning of 1990s more convenient technique appeared on the basis of PEO (polyethylene-oxide) and MMT (montmorillonite), which advantageously demonstrated the intercalation process in the polymer melt, as well as potential applications of the obtained products in solid phase electrolytes of recharged lithium batteries.However, highly promising commercial strategy in this problem was formulated after the group of researchers of Toyota company [24][25][26] had found extraordinary strengthening of mechanical properties of polymer-layered nylon-based nanocomposites, which was caused by extremely large surface contacts of the ingredients and high aspect ratio reached in the intercalation/exfoliation process, and by homogenous dispersion of silica plates in the polymer matrix [27,28]. On the one hand, these functional materials have a relation to nanocomposites via

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Single-layer dispersions of transition metal dichalcogenides in the synthesis of intercalation compounds

Cited by 66 publications

References 129 publications

High yield exfoliation of two-dimensional chalcogenides using sodium naphthalenide

High yield exfoliation of two-dimensional chalcogenides using sodium naphthalenide

Electronic structure of intercalation compounds of molybdenum disulfide MMoS2 (M = Cu, Ag) studied by X-ray emission and X-ray photoelectron spectroscopies

Physical Chemistry of Intercalated System

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