These Images show atomically thin MoS2 with micro- and nano-scale roughnesses and their corresponding water contact angles. (Credit: University of Illinois)

Molybdenum disulfide (MoS2), which is ubiquitously used as a solid lubricant, has recently been shown to have a two-dimensional form that is similar to graphene. But, when thinned down to less than a nanometer thick, MoS2 demonstrates properties with great promise as a functional material for electronic devices and surface coatings.

Researchers have developed a new approach to dynamically tune the micro- and nano-scale roughness of atomically thin MoS2, and consequently the appropriate degree of hydrophobicity for various potential MoS2-based applications. How new materials interact with water was a fundamental to the research. The wettability of atomically thin MoS2 — in particular, atomically thin MoS2 with micro- and nano-scale roughness — has remained relatively unexplored despite its strong potential for fundamental research and device applications.

The work will provide a new approach to dynamically tune the micro- and nano-scale roughness of atomically thin MoS2 and, consequently, the appropriate degree of hydrophobicity for various potential MoS2-based applications. Potential uses include medical applications with reduced hydrophobicity (WCA less than 100) for effective contact with biological substances.

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Medical