12033-29-3Relevant articles and documents
Synthesis and characterization of molybdenum disulphide formed from ammonium tetrathiomolybdate
Wang,Skeldon,Thompson,Wood
, p. 497 - 502 (1997)
An investigation has been carried out into the possibility of in situ formation of MoS2 within porous anodic films on aluminium, to improve subsequent tribological behaviour, by re-anodizing in thiomolybdate electrolyte. Acidification of thiomolybdate was employed to simulate the conditions for formation of the sulphide at the anodic film/electrolyte interface, followed by appropriate vacuum heat treatments to study possible temperature effects on the sulphide due to either friction or Joule heating during anodizing. The products of both acidification and heat treatment, characterized by X-ray powder diffraction and scanning electron microscopy, were compared with those formed by direct thermal decomposition of ammonium tetrathiomolybdate crystals. The precipitate formed by acidification was mainly amorphous molybdenum trisulphide (MoS3), which on heat treatment at 450 and 850°C yielded 3R-MoS2. 3R-MoS2 also formed by the thermal decomposition of thiomolybdate crystals. Thermogravimetric and differential thermal analyses showed that the decomposition of MoS3 to MoS2 occurred in the range 220-370°C and revealed the sequence of reaction steps. The findings suggest that mainly amorphous MoS3 is formed as a consequence of changes in the pH of the film/electrolyte interface during re-anodizing but the product is relatively easily transformed to crystalline MoS2 on moderate heating which may occur during wear processes.
Wardlaw, W.,Sylvester, N. D.
, p. 969 - 980 (1923)
Lineshapes of ESR signals and the nature of paramagnetic species in amorphous molybdenum sulfides
Deroide,Bensimon,Belougne,Zanchetta
, p. 853 - 853 (1991)
Amorphous and poorly crystallized molybdenum sulfides were studied by ESR. Qualitative analysis of the spectra suggested the presence of three paramagnetic species. A simulation of the ESR spectra was attempted. ESR lines were determined over the stoichiometric range MoS3 → MoS2. A good representation of the main part of the experimental lines was obtained. There was no significant variation of the g values of the various components of the spectra during the transformation from Mo3to Mo2. The first signal was attributed to sulfur centers. The other two signals were assigned to metal centers.
Bensimon, Y.,Belougne, P.,Deroide, B.,Giuntini, J. C.,Zanchetta, J. V.
, p. 471 - 478 (1991)
Silbernagel, B. G.,Pecorano, T. A.,Chianelli, R. R.
, p. 380 - 388 (1982)
Simple solution route to uniform MoS2 particles with randomly stacked layers
Li, Qing,Li, Ming,Chen, Zhiqian,Li, Chunmei
, p. 981 - 986 (2004)
MoS2 particles of uniform size (ca. 70nm) consisting of random and loosely stacked layers have been synthesized from hydrazine solution with (NH4)2Mo3S13 as the precursor at 180°C for 16h under hydrothermal conditions. The particles were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and high-resolution transmission electron microscopy (HREM). The influences of reaction conditions are discussed while a mechanism is proposed to explain the formation of this peculiar morphology.
Formation and catalytic properties of edge-bonded molybdenum sulfide catalysts on TiO2
Araki, Yasuhiro,Honna, Kosaku,Shimada, Hiromichi
, p. 361 - 370 (2002)
The effect of preparation conditions (calcination atmosphere, sulfidation atmosphere, and sulfidation temperature) on the orientation of MoS2 clusters on TiO2 supports was studied. Edge-bonded MoS2 clusters formed when the catalyst was sulfided in a flow of H2S/N2 at 573 or 673 K. However, when sulfided in H2S/N2 at higher temperatures than 773 K, the edge-bonded MoS2 clusters transformed to highly aggregated basal-bonded MoS2 clusters. Catalytic activity tests, using hydrogenation of 1-methylnaphthalene as a model test reaction, revealed that the turnover frequency on the catalyst with edge-bonded MoS2 clusters prepared by sulfiding at 573 K in H2S/N2 was higher than that on the catalyst with basal-bonded MoS2 clusters prepared by sulfiding in H2S/H2.
Johnston, D. C.,Jacobson, A. J.,Silbernagel, B. G.,Frysinger, S. P.,Rich, S. M.,Gebhard, L. A.
, p. 244 - 249 (1984)
New synthesis route of PbMo6S8 superconducting Chevrel phase from ultrafine precursor mixtures: I. PbS, MoS2 and Mo powders
Even-Boudjada,Burel,Chevrel
, p. 237 - 252 (1998)
Fine powders of PbMo6S8 Chevrel phase (approximately 0.5 μm) obtained from new ultrafine precursor powders present excellent intrinsic superconducting properties, such as a critical temperature, Tc, of about 14 K. These results are due to ultrafine quasi-spherical PbS, MoS2, and Mo precursor powders (0.05-0.5 μm) of lead Chevrel phase synthesized by soft chemistry methods (precipitation, co-precipitation). Thus, a better reactivity between the grains of the mixture allows a decrease in the synthesis temperature of the resulting PbMo6S8 phase (800 °C instead of 950-1000 °C) required for the PbMo6SS8 synthesis from the same precursor powders made by the classical ceramic route. These new Chevrel phase powders have very fine homogeneous grains with high potential surface reactivity, giving improved grain boundaries that are able to carry high current densities.
Khudorozhko, G. F.,Asanov, I. P.,Mazalov, L. N.,Kravtsova, E. A.,Parygina, G. K.,et al.
, p. 199 - 210 (1994)
Micelle-assisted fabrication of necklace-shaped assembly of inorganic fullerene-like molybdenum disulfide nanospheres
Xiong, Yujie,Xie, Yi,Li, Zhengquan,Li, Xiaoxu,Zhang, Rong
, p. 180 - 185 (2003)
The fabrication of necklace-shaped assembly of inorganic fullerene-like molybdenum disulfide nanospheres via a micelle-assisted route is reported, in which necklace-shaped assembly of amorphous MoS3 nanospheres is driven by the aggregation transformation of surfactants at low temperatures and then is transformed to the assembly of target fullerene-like MoS2 by annealing. This nanostructure is a type of oriented assembly of inorganic fullerene-like structures, which is confirmed by the transmission electron microscopy and high-resolution transmission electron microscopy analysis. The optical absorption property is investigated to show their inorganic fullerene-like structure and uniform shape.
2D amorphous MoS3 nanosheets with porous network structures for scavenging toxic metal ions from synthetic acid mine drainage
Fu, Weng,Yang, Siyuan,Yang, Hong,Guo, Bao,Huang, Zhiqiang
supporting information, p. 18799 - 18806 (2019/08/20)
This is the first time that two-dimensional (2D) amorphous MoS3 nanosheets were prepared by the exfoliation of the bulk amorphous MoS3 material in dimethylformamide (DMF) solvent under ultrasonic irradiation. The obtained 2D amorphous MoS3 nanosheets show a unique porous network structure, which is quite different from that of 2D crystalline MoS2 nanosheets. The XPS and Raman results reveal that the structure of 2D amorphous MoS3 nanosheets contains high levels of active sulphide groups with unsaturated bonds, suggesting that this material can be applied as an efficient heavy metal scavenger in the field of environmental remediation. The interaction mechanisms between metal ions and specific sulphide groups on 2D amorphous MoS3 nanosheets have been discussed. The feasibility of toxic metal remediation (Cu, Cd and Hg) from a synthetic acid mine drainage solution has been proven. The results suggest that 2D amorphous MoS3 nanosheets as a new member of the 2D material family will have promising applications in environmental protection.
The sequential continuous-flow hydrothermal synthesis of molybdenum disulphide
Dunne, Peter W.,Munn, Alexis S.,Starkey, Chris L.,Lester, Edward H.
, p. 4048 - 4050 (2015/04/14)
Molybdenum disulphide (MoS2) has been widely used as a catalyst and high temperature lubricant. It has been heavily researched recently as a graphene analogue and member of the so-called inorganic fullerenes. Here we report the first continuous flow hydrothermal synthesis of MoS2. With fast reaction times and flexibility the continuous flow hydrothermal system allowed MoS2 to be produced in a stepwise fashion, offering an insight into the mechanism involved. It has been found that the synthesis of MoS2 proceeded via the sulphidation of molybdate anions to thiomolybdate species, which are transformed to amorphous MoS3 by acidification in flow, before further hydrothermal treatment decomposes this amorphous precursor to tangled MoS2 nanosheets. This journal is
