pH effect in Langmuir–Blodgett self-assembly of MoS2 and WS2 thin films

We reported Langmuir–Blodgett films of molybdenum disulphide and tungsten disulfide and studied the formation of MoS₂ MoS 2 and WS₂ WS 2 layers. The effect of the subphase pH is investigated. Also, the influence of the subphase conditions on the number of layers was reported. By varying the pH of the buffer solution subphase, the solvent-to-nanoparticle interaction is changed and the compression of the layer during deposition is influenced. The stacking of the MoS₂ MoS 2 and WS₂ WS 2 crystalline structure under the influence of subphase pH and the material concentration were investigated. Langmuir layers assembly is a useful method to manipulate the distribution of WS₂ WS 2 and MoS₂ MoS 2 . Successful deposition of dichalcogenides at the air–water interface on silicon substrate was performed using Balance Langmuir–Blodgett technique. The characterization of WS₂ WS 2 and films MoS₂ MoS 2 with X-ray diffraction, Raman spectroscopy, atomic force microscopy and scanning electron microscopy was carried out.