The MoSeS dynamic omnigami paradigm for smart shape and composition programmable 2D materials

Joel Berry, Simeon Ristić, Songsong Zhou, Jiwoong Park and David J. Srolovitz ()
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Joel Berry: University of Pennsylvania
Simeon Ristić: University of Pennsylvania
Songsong Zhou: University of Pennsylvania
Jiwoong Park: University of Chicago
David J. Srolovitz: University of Pennsylvania

Nature Communications, 2019, vol. 10, issue 1, 1-13

Abstract: Abstract The properties of 2D materials can be broadly tuned through alloying and phase and strain engineering. Shape programmable materials offer tremendous functionality, but sub-micron objects are typically unachievable with conventional thin films. Here we propose a new approach, combining phase/strain engineering with shape programming, to form 3D objects by patterned alloying of 2D transition metal dichalcogenide (TMD) monolayers. Conjugately, monolayers can be compositionally patterned using non-flat substrates. For concreteness, we focus on the TMD alloy MoSe$${}_{2c}$$2cS$${}_{2(1-c)}$$2(1−c); i.e., MoSeS. These 2D materials down-scale shape/composition programming to nanoscale objects/patterns, provide control of both bending and stretching deformations, are reversibly actuatable with electric fields, and possess the extraordinary and diverse properties of TMDs. Utilizing a first principles-informed continuum model, we demonstrate how a variety of shapes/composition patterns can be programmed and reversibly modulated across length scales. The vast space of possible designs and scales enables novel material properties and thus new applications spanning flexible electronics/optics, catalysis, responsive coatings, and soft robotics.

Date: 2019
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DOI: 10.1038/s41467-019-12945-5

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