Abstract
One-pot hydrothermal synthesis of MoS2 nanoplatelet arrays on various substrates is perhaps the most promising approach to fabricate efficient electrocatalysts for hydrogen evolution reaction. However, the main challenges in this synthesis remain the purity and crystallinity of MoS2. In this study, we show for the first time that irradiation of amorphous, defect-rich MoS2 nanoplatelets with a green nanosecond laser at a proper irradiation dose, ca ≤0.35 J cm−2, can significantly improve the crystallinity and purity of MoS2 nanoplatelets. The effect was confirmed by Raman spectroscopy investigations demonstrating a surprising intensity increase of the A1g and modes after the laser irradiation. Further increase of irradiation energy, however, resulted in the photocorrosion and destruction of MoS2 nanoplatelets. The variation of A1g and Raman mode intensities ratio depending on the green light irradiation dose was also presented and is discussed below.
Highlights
Single and few-layered dichalcogenides of transition metal, such as MoS2, MoSe2, TiSe2, WS2, NbS2, recently are among research topics due versatile their properties
We report for the first time the compositional and structural transformations of few-layered MoS2-based nanoplatelets induced by irradiation with the continuous wave (CW) or nanosecond-pulse lasers using the wavelength of 532 nm in air demonstrating that absorbed photons can induce drastic modifications towards the increase of purity and crystallinity of MoS2
The synthesis of densely packed molybdenum sulphide nanoplatelet arrays on the Ti substrate was undertaken by one-pot hydrothermal synthesis way from ammonium heptamolybdate and thiourea solution under modified conditions, reported previously[28]
Summary
Single and few-layered dichalcogenides of transition metal, such as MoS2, MoSe2, TiSe2, WS2, NbS2, recently are among research topics due versatile their properties. Except of mechanical and chemical exfoliation of pristine MoS2 crystals, nanocrystalline MoS2 can be synthesized by several methods including chemical vapour deposition[22], thermal decomposition[23], and hydrothermal/ solvothermal treatment using different Mo and S- containing precursors[24,25,26]. It is worth noticing, that MoSx-based single and few-layered materials possess a good visible light absorption[27] and, in contrast to inert graphene, possesses versatile chemistry including various phase and compositional www.nature.com/scientificreports/
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