Selective crack formation on stretchable silver nano-particle based thin films for customized and integrated strain-sensing system

Choi, Seong-Dae; Lee, Seung Hwan; Lee, Byeongmoon; Kim, Tae-Hoon; Hong, Yongtaek

doi:10.1016/j.tsf.2020.138068

Cited by 11 publications

(6 citation statements)

References 35 publications

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“…A wrinkle/wave structure in bilayer systems can be used in various fields, such as soft electronics, nano/microstructure fabrication, and biology, by using the adjustability of the maximum stretchability and compressibility of the rigid layer, structural characteristics, component material properties of the wrinkle structure, and various patterning possibilities ( Figure 2 i). Some applications include dry adhesives [ 71 ], capacitors [ 74 ], stretchable and compressible circuits [ 75 ], cell culture platforms [ 42 ], crack–based sensors [ 76 ], diodes [ 35 ], MESFETs [ 51 ] (metal semiconductor field effect transistor), photodetectors [ 77 ], pressure sensor [ 65 ], and QR CODEs [ 49 ].…”

Section: Structural Designs For Flexible Sensory Systemsmentioning

confidence: 99%

Flexible Sensory Systems: Structural Approaches

et al. 2022

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Biology is characterized by smooth, elastic, and nonplanar surfaces; as a consequence, soft electronics that enable interfacing with nonplanar surfaces allow applications that could not be achieved with the rigid and integrated circuits that exist today. Here, we review the latest examples of technologies and methods that can replace elasticity through a structural approach; these approaches can modify mechanical properties, thereby improving performance, while maintaining the existing material integrity. Furthermore, an overview of the recent progress in wave/wrinkle, stretchable interconnect, origami/kirigami, crack, nano/micro, and textile structures is provided. Finally, potential applications and expected developments in soft electronics are discussed.

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Section: Structural Designs For Flexible Sensory Systemsmentioning

confidence: 99%

Flexible Sensory Systems: Structural Approaches

et al. 2022

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“…The advantage of inkjet printing technology is that the patterns are easily customizable. ,, It is easy to create various patterns and convenient to print multiple patterns at once. In Figure f, strain sensors of various sizes were simultaneously printed on one PMMA-coated glass substrate and then transferred to TPU.…”

Section: Resultsmentioning

confidence: 99%

“…For the aforementioned strain sensing applications, various printing technologies such as inkjet, electrohydrodynamic (EHD), gravure, screen, and aerosol jet printings have been proposed to fabricate strain sensors. Compared with photolithography, printing technologies are beneficial for fabricating strain sensors because printing can easily customize the printing patterns with a simple process . The pattern input image is only required and can be redesigned according to the body shapes of different patients.…”

Section: Introductionmentioning

confidence: 99%

Stretchable Substrate Surface-Embedded Inkjet-Printed Strain Sensors for Design Customizable On-Skin Healthcare Electronics

Cho,

Kim,

Kim

et al. 2024

ACS Appl. Electron. Mater.

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Stretchable strain sensors have been proposed for personalized healthcare monitoring or human motion detection in a skin-mountable form factor. For customization and stretchable substrate-compatible low-temperature processing, various printing technologies have been utilized to fabricate strain sensors. Hydrophobic stretchable polymers and low viscosity conductive inks are typically used in printed high resolution strain sensor fabrications. However, directly printed strain sensors on hydrophobic stretchable substrates have shown limited printability in pattern continuity, spatial resolution, stretchability, and linearity. Therefore, there is still a need to develop a simple printing process that can fabricate high-resolution stretchable strain sensors for skin-mountable healthcare electronics. In this work, we developed a simple inkjet printing and substrate transfer process for stretchable strain sensors by optimizing a polymer coating layer for enhancing the printed pattern formation, spatial resolution, and substrate transfer efficiency simultaneously while maintaining the benefits of inkjet printing, such as customizability and large-area applicability. The printed stretchable strain sensors are embedded into a stretchable substrate, improving stretchability up to 45% of strain, which successfully detects various parts of our body, such as wrists, fingers, and arms. Further, the printing process scales down the sensors to 150 μm × 6 mm, and the miniaturization enables distinguishing subtle movements of different fingers.

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“…The threshold stress is determined to be 221 MPa obtained from the FEM simulation (see table 3). When the stress exceeds 221 MPa, cracks initiate from existing flaws such as microcracks and pores in the Pt film [43][44][45][46]. As discussed previously, the crack density is associated with the pre-existing defects in the Pt film, and the formation of cracks impedes further crack generation.…”

Section: The Influence Of Island Shape and Gap On Crack Formation In ...mentioning

confidence: 91%

The influence of Pt islands on the failure of Pt thin film on a flexible PET substrate

Du,

Huang,

2024

J. Phys. D: Appl. Phys.

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Flexible electronic devices must adapt to compliant polymeric substrates, thus maintaining the mechanical integrity of the multilayer systems is crucial. This study investigates the mechanical failure caused by active islands, focusing on how Pt islands influence the failure mechanism of a thin Pt film on a flexible PET substrate under uniaxial tensile loading. Tensile testing of the Pt film/PET bilayer revealed a failure progression in the Pt blanket film, characterized by crack initiation, elongation and merging, eventually delamination, and buckling, with the increase in tensile strain. Pt islands induced early crack initiation at comparatively low strains due to increased stress near their vertical edges. The impact of island shape and gap on the crack formation in a Pt film was subsequently investigated. The gap between islands, oriented perpendicular to the loading direction, has minimal impact on crack number and density; the presence of Pt islands reduced the stress in the Pt film within the gap, thereby lowering the susceptibility of cracking in these areas. Variations in island shape and gap along loading direction alter the stress profile in the film between islands but did not significantly impact crack density. Crack density is believed to be primarily associated with pre-existing defects, with the formation of cracks serving as a stress relief mechanism that prevents further crack initiation. Our study sheds light on the impact of active islands on blanket film failure and offers practical recommendations to mitigate crack formation, which may contribute to the optimisation of flexible electronics design.

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Selective crack formation on stretchable silver nano-particle based thin films for customized and integrated strain-sensing system

Cited by 11 publications

References 35 publications

Flexible Sensory Systems: Structural Approaches

Flexible Sensory Systems: Structural Approaches

Stretchable Substrate Surface-Embedded Inkjet-Printed Strain Sensors for Design Customizable On-Skin Healthcare Electronics

The influence of Pt islands on the failure of Pt thin film on a flexible PET substrate

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