Deterministic Folding of 2D Materials for Electronic Device Application

Atomically-thin two dimensional materials such as graphene have exceptional thermal and mechanical properties, therefore two-dimensional (2D) sheets can be deterministically stretched, strained and folded into various origami structures. The deterministic folding of 2D materials can induce novel optical, electronic, and magnetic properties. In this talk, a deterministic self-folding technique for creating folded 2D material structures will be reported. This new folding approach can realize micrometer and sub-micrometer scale folding of 2D sheets such as graphene, MoS₂, h-BN and their heterostructures at well-defined angles and positions, without external polymers attached to the sheets. The technique is efficient and scalable. Utilizing this folding technique, well-defined vertical 2D homostructures and heterostructures with interlayer interactions can be achieved. All-2D material tri-gate transistors can be efficiently constructed using this folding technique, which demonstrate excellent electrical performance and potential for circuit level applications. This technique could be promising for realizing advanced foldable and adaptive 2D electronics, nano-actuating, and bio-nano interfaces.