초록 ▼

Novel single layer materials of the form MX2, where MX2 is a layer-type dichalcogenide such as MoS2, TaS2, WS2, or the like, exfoliated by intercalation of an alkali metal, and immersion in water, are disclosed. MoS2 has been exfoliated into monolayers by intercalation with lithium followed by react

Novel single layer materials of the form MX2, where MX2 is a layer-type dichalcogenide such as MoS2, TaS2, WS2, or the like, exfoliated by intercalation of an alkali metal, and immersion in water, are disclosed. MoS2 has been exfoliated into monolayers by intercalation with lithium followed by reaction with water. X-ray diffraction analysis demonstrates that the exfoliated MoS2 in suspension is in the form of one-molecule-thick sheets. X-ray patterns from dried and re-stacked films of exfoliated MoS2 indicate that the layers are randomly stacked. By adsorbing monolayers or precipitating clusters of various species such as compounds of Co, Ni, Pb, Cd, Al, Ce, In and Zn, on MoS2 while the sulfide is suspended as single layers and then recrystallizing, a new group of inclusion compounds can be formed. In the re-crystallized or re-stacked materials, the inter-layer spacing can be expanded or contracted compared to MoS2.

대표청구항 ▼

An exfoliation process for preparing a single layer substance of the form MX2 wherein MX2 is a layer type transition metal dichalcogenide selected from the group consisting of MoS2, TaS2, WS2, which comprises: (a) intercalating multi-layer MX2 with an alkali metal in a dry environment for sufficient

An exfoliation process for preparing a single layer substance of the form MX2 wherein MX2 is a layer type transition metal dichalcogenide selected from the group consisting of MoS2, TaS2, WS2, which comprises: (a) intercalating multi-layer MX2 with an alkali metal in a dry environment for sufficient time to enable the alkali metal to substantially intercalate the layers of the MX2; and (b) immersing the alkali metal intercalated MX2 in a liquid that generates a gas upon reaction with the alkali metal to thereby with suitable agitation cause the layers of MX2 to separate.