Bi-layer molybdenum disulfide obtains from molybdenum disulfide-melamine cyanurate superlattice with a thermal shock

To investigate thermal shock properties of melamine cyanurate (MCA) for molybdenum disulfide (MoS₂) exfoliation, the MoS₂-MCA superlattice is prepared through self-assembly of pristine MoS₂, cyanuric acid (CA) and melamine (MA) in water solution. The prepared MoS₂-MCA is heated in tubular furnace with controlled temperature to obtain two-dimensional (2D)-MoS₂ precursor. Their morphologies are characterized by using Fourier transform infrared (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The obtained 2D-MoS₂ precursor shows a high specific surface area at 336.90 m²/g due to bi-layer MoS₂. TEM and atomic force microscope (AFM) images of 2D-MoS₂ N-methyl-2-pyrrolidone (NMP) solution further confirm the bi-layer MoS₂ exfoliation. The above results prove that MCA is a good thermal shock agent for MoS₂ exfoliation. And the prepared 2D-MoS₂ precursor could also be a good solid reservoir.