Abstract
The wrinkling structures, which can greatly improve the stretchability of the metallic thin films, have been widely used in the preparation of stretchable devices. However, the artificial wrinkling structures are often accompanied by the generation of microcracks, which seriously affect the performance of the devices. In this work, by establishing the corresponding model, the transverse strain of the longitudinally prestrained continuous film and the strip film is mechanically analyzed, which is verified by experimental results; for the strain of blank substrate, the error of the model was about 3.7%. It is difficult to avoid the generation of microcracks with continuous films, but strip films can avoid the generation of microcracks to a certain extent. The experimental results illustrate the various factors affecting the generation of microcracks. The transverse strain of the film is proportional to the substrate’s Young’s modulus, Poisson’s ratio, thickness, and prestrain and is basically inversely proportional to the strip film’s Young’s modulus, thickness, and strip interval. Our results provide deeper knowledge for choosing proper metallic materials to fabricate stretchable wrinkled devices.
Highlights
With the development of the application of wearable equipment, stretchable electronic devices have attracted wide attention [1,2,3]
By preparing wrinkled a structure with different prestrains and different strip intervalss of metallic thin films, we explored the factors influencing the formation of microcracks in wrinkled metallic thin films
The horizontal direction of the substrate shrinks from L(1 + εpre ) to L, and the thin film is uniformly compressed in this direction to form an ordered wrinkled nanostructure
Summary
With the development of the application of wearable equipment, stretchable electronic devices have attracted wide attention [1,2,3]. They have a wide range of applications including disposable electronics, electronic skins, and flexible displays, due to their reliable portability, excellent stretchability and bendability, fit to the human body, elastic deformation, etc. Stretchable devices are mainly composed of polymer substrates and functional layers directly coated or multi-step transferred onto them. For many functional materials, such as metallic thin films, are almost non-stretchable [14,15,16], and will crack under a very small tensile strain, making the device unusable. Khang et al [23]
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