Synthesis of bilayer MoS2 nanosheets by a facile hydrothermal method and their methyl orange adsorption capacity

Preparation and Characterization of Few Layered MoS2 Nano Flakes

“…The single layer MoS 2 exhibits strong band at 384 & 400 cm -1 , which are associated with the in-plane vibrational (E 1 2g ) and the out of plane vibrational (A 1 g ) modes respectively. [8] As the formation of monolayer increases, a red shift of the (E 1 2g ) band and a blue shift of the (A 1g ) bands would be observed. Results indicate that the (E 1 2g ) and A 1g bands for the pristine and MoS 2 nanosheets are located at 373 and 376 cm −1 , and 399 and 397.20 cm −1 , respectively.…”

“…Raman spectroscopic analysis of the samples is carried out using HR 800 micro-Raman, HORIBA Jobin Yovon, France at the scanning range of 250 to 500 cm with a laser source of excitation wavelength 514 nm. [8], [9] The particle size was calculated using Scherrer formula, Where,  is the wave length of the X-ray (1.5406A o ),  is the full width of the peak at half its maximum intensity in radian,  is the Bragg's diffraction angle and D is the average crystallite size. The crystallite sizes obtained for the Pristine MoS 2 , Exfoliated MoS 2 and Modified MoS 2 ) are given in Table 1.…”

Revealing the role of the 1T phase on the adsorption of organic dyes on MoS2 nanosheets

“…The high adsorption capacity reported for some MoS 2 nanosheets and MoS 2 based heterostructures were ascribed to the high surface area of MoS 2 and MoS 2 -composites, which increases the number of active sites per unit volume and consequently leads to high adsorption capacity. 31 However, in other studies, 7,32 it has been demonstrated that the surface area has no effect on the adsorption activity. Whereas an effect of intermolecular interaction, such as van der Waals and electrostatic attraction, 7 or the existence of highly reactive OH radical groups on the MoS 2 surface 33 was proposed.…”

The Nanosized Dye Adsorbents for Water Treatment

“…Molybdenum disulfide (MoS 2 ), which is a member of layered transition metal dichalcogenides (TMD), consists of a single Mo layer covalently sandwiched between two sulfur layers, i.e., creating an S-Mo-S layered structure. In contrast to the strong covalent bond existing in each MoS 2 sheet, similar to graphite, there is a weak Van der Waals force between the adjacent layers (Figure 11a), which, thereby, facilitates exfoliation of the MoS 2 few or monolayered nanoflakes from the bulk MoS 2 [161]. The thickness of a monolayer MoS 2 has been reported to be~6.5 Å [162], Figure 11b,c, while a bilayer flake is 13 Å thick, i.e., two times of a monolayer MoS 2 's [163].…”