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Low-Energy Cluster Implantation to form Janus Monolayers

Selenium atoms, represented by orange, implant in a monolayer of blue tungsten and yellow sulfur to form a Janus layer. In the background, electron microscopy confirms atomic positions. Credit: Oak Ridge National Laboratory, U.S. Dept. of Energy
Selenium atoms, represented by orange, implant in a monolayer of blue tungsten and yellow sulfur to form a Janus layer. In the background, electron microscopy confirms atomic positions. Credit: Oak Ridge National Laboratory, U.S. Dept. of Energy

Scientific Achievement: Selective replacement of the top atoms of an atomically thin 2D crystal to form Janus monolayers has been achieved by hyperthermal implantation of clusters generated by laser ablation.

Significance and Impact: Hyperthermal implantation of atomically thin 2D crystals presents a new, low-temperature synthesis method to form novel Janus structures, alloys, and metastable phases that may have unique quantum properties.

DOI: 10.1021/acsnano.9b10196

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