article · Nanomaterials
A method has been established to synthesise molybdenum trioxide and molybdenum disulfide hybrid thin layers through the controlled partial oxidation of molybdenum disulfide nanoflakes. Liquid-phase exfoliation provides homogenous starting nanoflakes, supporting high reproducibility during the oxidative process. Conducting the oxidation reaction in darkness slows the reaction rate sufficiently to form the hybrid material rather than fully oxidising it. Structural and chemical characterisation confirms the presence of molybdenum trioxide, molybdenum disulfide, and intermediate oxysulfide compounds within the thin layers. Optical measurements show that the hybrid material displays slightly redshifted absorption peaks alongside new absorption features in the near-infrared region, which stem from defects introduced during oxidation. Tracking the atomic composition across different reaction times offers precise structural data to assist in the refinement of two-dimensional molybdenum disulfide technologies.
Two-dimensional nanomaterials often require controlled modification to tailor their optical and electronic characteristics. By demonstrating a straightforward liquid-phase method that produces hybrid thin layers with expanded absorption into the near-infrared range, this work outlines how light-sensitive and electronic properties can be adjusted predictably without requiring complex manufacturing setups.
The findings offer guidance for developers designing electronic and optoelectronic devices based on two-dimensional molybdenum disulfide. The ability to tailor optical absorption into the near-infrared spectrum may benefit optical sensor or device development. However, this work represents early-stage materials synthesis and laboratory characterisation, with device fabrication, testing, and operational performance remaining to be demonstrated.
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In the present study, MoO3:MoS2 hybrid thin layers have been synthesized through partial oxidation of MoS2. We have demonstrated that the reaction requires darkness conditions to decrease the oxidation rate, thus obtaining the hybrid, MoO3:MoS2. A simple liquid-phase exfoliation (LPE) is carried out to achieve homogenous MoS2 nanoflakes and high reproducibility of the results after MoS2 oxidation. XPS analyses reveal the presence of MoO3, MoS2, and MoOxSy in the hybrid layer. These results are also confirmed by X-ray diffraction and high-resolution TEM. Optical absorbance reveals that the absorption peaks of the MoO3:MoS2 hybrid are slightly redshifted with the appearance of absorption peaks in the near-infrared region due to the defects created after the oxidation reaction. The composition and atomic percentages of each component in the hybrid layer as a function of reaction time have also been reported to give perspective guides for improving electronic and optoelectronic devices based on 2D-MoS2.
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DOI: 10.3390/nano12183171
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