Epitaxial monolayer MoS 2 on mica with novel photoluminescence. The chemistry of two-dimensional layered transition metal dichalcogenide nanosheets. Electronics and optoelectronics of two-dimensional transition metal dichalcogenides. Direct observation of the transition from indirect to direct bandgap in atomically thin epitaxial MoSe 2. This work not only provides a novel route toward the batch-production of monolayer WS 2 via the introduction of metal foil substrates but also opens up its direct application for facile HER. The effects of coverage and domain size (which correlate closely with the active edge density of WS 2) on the electrocatalytic activity were investigated. The WS 2 nanosheets on Au foils featuring abundant edges were then discovered to be efficient catalysts for the HER, exhibiting a rather high exchange current density of ∼30.20 μA/cm 2 and a small onset potential of ∼110 mV.
The edge lengths of the universally observed triangular WS 2 nanosheets are tunable from ∼100 to ∼1,000 nm. Here, we demonstrate for the first time the successful synthesis of uniform monolayer WS 2 nanosheets on centimeter-scale Au foils using a facile, low-pressure chemical vapor deposition method. Intriguingly, the edge of WS 2 exhibits an ideal hydrogen binding energy, which makes WS 2 a potential alternative to Pt-based electrocatalysts for the hydrogen evolution reaction (HER).
Monolayer tungsten disulfide (WS 2), a typical member of the semiconducting transition metal dichalcogenide family, has drawn considerable interest because of its unique properties.
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