Programming Shape, Composition Patterns and Dynamics of 2D Transition Metal Dichalcogenide Alloys

 · Invited

Abstract

The properties of 2D materials can be tuned through alloying and phase and strain engineering. I will present a novel 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 MoSe2cS2(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. I will also demonstrate the mechanical actuation of 2D TMD alloy films through application of electric fields.

*This work was funded by the Center for the Computational Design of Functional Layered Materials, an Energy Frontier Research Center funded by the United States Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES), under award no. DE-SC0012575

–

Presenters

  • David Srolovitz

    • City Univ of Hong Kong

Authors

  • Joel M Berry

    • Lawrence Livermore National Laboratory

  • Simeon Ristić

    • University of Pennsylvania

  • Songsong Zhou

    • University of Pennsylvania

  • Jiwoong Park

    • Department of Chemistry, University of Chicago
    • University of Chicago
    • Pritzker School of Molecular Engineering, University of Chicago

  • David Srolovitz

    • City Univ of Hong Kong