Asymmetric surface effect on the configuration of bilayer Si/SiGe nanosprings

Abstract

This study investigates the asymmetric surface effect on nanosprings composed of Si/SiGe bilayer thin films.

Controllable helical deformations on printed anisotropic composite soft actuators

“…Although in the past decade several approaches were proposed to fabricate and model helical deformations, most of them were based on the idea of building internal stresses within a multilayer structure which only exhibits a one-shot deformation to a helical shape. [24][25][26][27][28][29][30][31][32] For example, the formations of general chiral morphologies such as nanohelices in nanomaterials induced by anisotropic surface stresses have been studied. 32 Yet, these one-shot deformation approaches are not applicable for actuators and robots that require reversible and repeatable motions.…”

Edge effect of strained bilayer nanofilms for tunable multistability and actuation

“…Previous experimental studies on Si/Cr strips have confirmed that the scrolling behavior and the diameter of the rolled-up structures can depend on the layer thickness, 8 the strip width, 9, 10 the misorientation angle between the strip axis and the preferred scrolling orientation, 11 and anisotropic underetching on different Si substrates. 12 Additional surface and edge effects also play a role in strained microstructures, 13, 14 which provides additional freedom when designing 3D geometries.…”

“…Many researchers have used continuum modeling 13, 14, 24–26 and atomic modeling 27–29 to study scrolling in multilayer nanostructures. Multiscale modeling approach is also available to combine both nanoscale atomic behaviors and macroscopic deformation.…”