RETRACTED ARTICLE: Cost effective liquid phase exfoliation of MoS2 nanosheets and photocatalytic activity for wastewater treatment enforced by visible light

Abstract

Scalable production of high-quality MoS 2 nanosheets remains challenging for industrial applications and research in basic sciences. N-methyl-2pyrrolidine (NMP) is a commonly used solvent for exfoliation of MoS 2 nanosheets having further disadvantage of slow volatility rate. The present study demonstrates a cost-effective facile chemical route to synthesize few-layer MoS 2 nanosheets using acetone as a solvent and by varying bulk initial concentration of samples to scale up the production in large scale to fulfill the demand for potential applications. In our study, we aim to obtain stable growth of high quality few layer MoS 2 nanosheets by long sonication times. Optical absorption spectra, Raman spectra, size of nanosheets and layer thickness of as-grown MoS 2 nanosheets were found to be matching with those obtained from other synthesis methods. Effective photocatalytic performance of MoS 2 nanosheets without being consumed as a reactant was experimented by decomposing Methylene Blue dye in aqueous solution under irradiation of visible light. This study provides an idea to synthesize low-cost, sustainable and efficient photocatalytic material in large scale for the next generation to control water pollution quite efficiently by protecting the environment from the contamination coming from these dyes.

Black Phosphorus-Molybdenum Disulfide Hetero-Junctions Formed with Ink-Jet Printing for Potential Solar Cell Applications with Indium-Tin-Oxide

“…The BP has an intrinsically p-type conduction whereas MoS 2 has an intrinsically ntype conduction as corroborated by prior studies [2,26]. Figure 3a shows the schematic cross-section of the inkjet-printed vertical 2D p-n junction heterostructure device where the layers are printed to form a stack.…”

“…Raman and PL spectroscopy are powerful techniques to characterize various 2D materials. The optoelectronic properties of the black phosphorous and MoS 2 depend on their thicknesses [26]. In Figure 2b, the inkjet-printed BP shows the Raman peaks occurring at 361.0 cm −1 , 436.9 cm −1 , and 464.3 cm −1 wavenumbers, which correspond to the locations of the A 1 g , B 2g , and A 2 g phonon modes, respectively, for a few layers of BP.…”

“…Therefore, BP has attracted a great deal of attention for the research community and the electronics industry, to potentially use its exceptional properties in areas such as field-effect transistors (FETs) [16], photodetectors [17,18], and flexible optoelectronics [19][20][21]. Bulk BP, similar to other TMDCs, can be cleaved into its constituent layers through mechanical [22][23][24] or liquidphase exfoliation [25,26]. Apart from the ability of liquid exfoliation to yield large quantities of nanosheets, it also has added advantages such as solution processability with the manufacture of devices on a wide variety of substrates, including in composite formats.…”

“…It is anticipated that the tightly packed solvation shells in close proximity to the BP surface act as a protective barrier against moisture and oxygen that are known to deter the remarkable properties of BP [25]. With MoS 2 , one of the most well-studied 2D TMDs, a thickness-dependent bandgap results that transitions from direct to indirect bandgap from 1.9 (monolayer) to 1.23 eV (bulk) [26].…”

Nanostructured LaFeO3-MoS2 for efficient photodegradation and photocatalytic hydrogen evolution

“…Ultrathin few-layer MoS 2 nanosheets have been prepared directly from their bulk powder with a high yield of 60% via a facile ultrasound assisted exfoliation technique, which has been described in details elsewhere [31,34]. Initially, a 5 mg/mL solution of MoS 2 powder and isopropanol was prepared.…”