Forms of transition metal dichalcogenides

Details Forms of transition metal dichalcogenides Forms of transition metal dichalcogenides

1986-04-23

1989-04-18

Doll, John

Chemistry of inorganic compounds

Sulfur or compound thereof

Binary compound

423 53, 423 62, 106DIG2, 252378R, 429194, 429196, 429199, 429218, 502215, 502219, 502220, C10B 1720, C01G 3500, C01G 3906, C01G 4100

Patent

active

048225908

ABSTRACT:
Novel single layer materials of the form MX.sub.2, where MX.sub.2 is a layer-type dichalcogenide such as MoS.sub.2, TaS.sub.2, WS.sub.2, or the like, exfoliated by intercalation of an alkali metal, and immersion in water, are disclosed. MoS.sub.2 has been exfoliated into monolayers by intercalation with lithium followed by reaction with water. X-ray diffraction analysis demonstrates that the exfoliated MoS.sub.2 in suspension is in the form of one-molecule-thick sheets. X-ray patterns from dried and re-stacked films of exfoliated MoS.sub.2 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 MoS.sub.2 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 MoS.sub.2.

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