NDLI: Ordering and manipulation of MoS<sub>2</sub> platelets on differently charged micas by atomic force microscopy

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Journal of Materials Chemistry Vol - 6 Issue - 3

Journal of Materials Chemistry Vol - 6 Issue - 2

Journal of Materials Chemistry Vol -5

Journal of Materials Chemistry Vol -4

Journal of Materials Chemistry Vol -3

Ordering and manipulation of MoS₂ platelets on differently charged micas by atomic force microscopy

Content Provider	Royal Society of Chemistry (RSC)
Author	Mulley, Suzanne Tomlinson, Anthony A. G. Stefanis, Adriana De Sironi, Angelo
Copyright Year	1996
Abstract	Atomic force microscopy (AFM) has been used to investigate how dispersed MoS2 platelets (from colloidal suspensions) deposit onto three natural (Muscovite) mica (001) surfaces. Different platelet arrangements are observed, which are attributed to defects and charging effects of the mica (as well as the concentration of starting colloid). The provenance of the mica influences the self-organisation of the platelets into long tape-like assemblies (South Dakota mica) or individual flakes (Alps mica). Atomic scale imaging of the tapes reveals a distorted octahedral (Oh)-based local structure, different from the trigonal prismatic structure found in the 2H-polytype of annealed MoS2, in agreement with previous structural results on water-dispersed MoS2 platelets. The buckling and susceptibility to stripping of the tapes is ascribed to the presence of a water layer between the substrate mica and MoS2, and after stripping by the tip, the platelets ultimately form small clusters. The ordering of these clusters depends not only on the defect and charge structure of the mica, but also on complex hydration reactions between the H2O layer associated with the MoS2 and K + ions of the mica. Relatively symmetrical squares may be lifted out of the tapes, supporting the presence of weak bonding between tape and mica. Conversely, Alps and Bihar micas give rise to separate platelets, which are resistent to tip manipulation, which is attributed to hydrophobic interaction between MoS2 platelets and the mica surface.
Starting Page	661
Ending Page	666
Page Count	6
File Format	PDF
ISSN	09599428
Volume Number	6
Issue Number	4
Journal	Journal of Materials Chemistry
DOI	10.1039/JM9960600661
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	South Dakota Alps Bihar Atomic-force microscopy Mica Platelet Colloid Atomic spacing Properties of water Hydrophobe
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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