Abstract
Abstract Single-molecular layers of WS2 have been prepared by Li-intercalation using n-butyllithium and exfoliation in water. The preparation of single-molecular layers of WS2 was found to be more difficult than that for MoS2. The saturated Li content is x = 0.4 in LixWS2 for intercalation at room temperature. In order to obtain complete exfoliation, it is necessary that x ⩾ 1, which we have shown can be obtained with elevated-temperature intercalation. X-ray diffraction patterns of single layer WS2 suspensions in water clearly show the two-dimensional features of the material, i.e. only (hk0) peaks are present in the pattern and strong asymmetric line shapes of Bragg peaks due to the Warren effect. The line shapes of X-ray diffraction patterns from single layer WS2 are quite different from those of single layer MoS2 due to structure factor effects. We have determined that single layer WS2 has an expanded a-spacing and strongly distorted octahedral coordination with a 2a0 superlattice. The 1.8 eV optical band gap absorption of bulk WS2 is not observed in single layer WS2.
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