Kirigami Engineering-Nanoscale Structures Exhibiting a Range of Controllable 3D Configurations

Area of Science:

• Materials Science
• Mechanical Engineering
• Nanotechnology

Background:

• Kirigami offers a novel method for fabricating complex 3D microstructures from flat films.
• Conventional methods struggle to achieve intricate 3D configurations at the micro- and nanoscale.

Purpose of the Study:

• To investigate the buckling-induced out-of-plane transformations in kirigami structures.
• To establish a link between kirigami geometry and achievable 3D configurations.
• To provide a computational-experimental framework for controlling kirigami behavior.

Main Methods:

• In situ electron microscopy to observe shape transformations.
• Geometrically nonlinear finite element analysis (FEA) for predictive modeling.
• Systematic variation of kirigami cut geometry and film thickness.

Main Results:

• Distinct out-of-plane configurations achieved through kirigami design, separated by critical geometric transitions.
• FEA accurately predicts experimental observations of buckling modes and transitions.
• The ratio of in-plane cut size to film thickness significantly influences out-of-plane configurations.

Conclusions:

• The combined computational and experimental approach advances the understanding of kirigami-based shape transformations.
• This work provides a pathway to precisely control 3D configurations for micro- and nanoscale kirigami.
• Kirigami structures offer potential applications in micro-optics, actuators, and nanorobotics, especially at sub-micrometer scales.