An Anti‐Fatigue Design Strategy for 3D Ribbon‐Shaped Flexible Electronics

Xu, Cheng; Zhang, Fan; Bo, Renheng; Shen, Zhangming; Pang, Wenbo; Jin, Tianqi; Song, Honglie; Xue, Zhaoguo; Zhang, Yihui

doi:10.1002/adma.202102684

Cited by 30 publications

(18 citation statements)

References 84 publications

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“…It has been revealed in Figure that the present design involves the Cu/PI organic–inorganic composite structure, which, according to the literature, − helps increase the ductility of Cu by delocalizing its deformation. To validate the protective effect of PI against rupture of Cu, we conducted a uniaxial tensile test for a straight Cu/PI/Cu composite structure with thicknesses of 18 μm, 100 μm, and 18 μm; a length of 40 mm; and a width of 0.3 mm.…”

Section: Results and Discussionmentioning

confidence: 62%

“…Here, the design of a thick Cu layer is of great significance to reduce the thermal loss and ensure the electrical performance of the SEFM . The thick PI layer is beneficial to increasing the ductility of Cu by delocalizing its deformation, − enhancing the restoring ability and antifatigue ability . Through-hole punching and Cu deposition were used at certain locations of the etched film to connect electrodes of the two sides.…”

Section: Results and Discussionmentioning

confidence: 99%

“…49 The thick PI layer is beneficial to increasing the ductility of Cu by delocalizing its deformation, 50−52 enhancing the restoring ability and antifatigue ability. 53 Through-hole punching and Cu deposition were used at certain locations of the etched film to connect electrodes of the two sides. A 1.3mm-thick PZT plate was polarized and mechanically cut into 1 mm × 1 mm × 1.3 mm slender pillars.…”

Section: Resultsmentioning

confidence: 99%

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Stretchable Electronic Facial Masks for Sonophoresis

et al. 2022

ACS Nano

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We introduce a stretchable electronic facial mask (SEFM) as a platform for facial healthcare, which can integrate with various sensors and actuators. As a demonstration, an SEFM for sonophoresis enabling the promotion of the delivery effect of a drug mask is developed. To overcome the technique challenges, several approaches including the design of the joined silicone layer by two planar half-face portions and the single-side soft pressing (SSSP) technique for encapsulation are exploited in this work, which could be extended to the design and fabrication of other stretchable electronics. The mechanical, thermal, electrical, and ultrasonic characteristics of the SEFM are all verified by the finite element analysis and experiments. Finally, we prove the effect of the SEFM on accelerating the delivery of hyaluronic acid (HA) through animal experiments and confirm that the SEFM can enhance the skin moisture content by 20% via human facial experiments.

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Section: Results and Discussionmentioning

confidence: 62%

Section: Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Stretchable Electronic Facial Masks for Sonophoresis

et al. 2022

ACS Nano

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“…The buffer layer strategy can also be extended to the islandbridge systems consisting of 3D helical interconnects formed by the mechanically guided assembly techniques (see Figure 6a), as reported in recent years. [69][70][71][72][73][74][75][76][77][78][79][80][81] 3D helical interconnects have shown superior performances in compliance as well as stretchability. [18,61,82] However, in some application scenarios such as when brittle functional materials (e.g., highly doped silicon for thermoelectric coils [26,27] ) with ultra-low fracture strain apply, the compliance of the helical interconnect is severely restricted and therefore needs to be optimized.…”

Section: D Helical Interconnectsmentioning

confidence: 99%

Island Effect in Stretchable Inorganic Electronics

Shuai

et al. 2022

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microsystem technologies integrated with the human body for health monitoring [8][9][10][11][12][13][14] and disease treating, [15][16][17][18][19][20][21][22][23] to soft systems for low-power radio communication, [24] efficient energy harvesting/ storage, [25][26][27][28] high-capacity memory technologies, [29,30] and seed-inspired electronic micro-fliers. [31,32] An important class of these deformable electronic devices relies on novel structural designs of the device layout and hybrid integration with the soft elastomer substrate to achieve a high elastic stretchability in devices made of inorganic electronic components. [33][34][35][36][37][38][39][40] Herein, the elastic stretchability refers to the value of elongation of the device as elastically stretched to a strain level, below which the device can reversibly return to the load-free state, even after thousands of cycles without material failure, for example, fatigue failure of ductile materials, fracture of brittle materials and delamination at adhesive interfaces. Among various structural designs of stretchable inorganic electronics, [41][42][43][44][45][46][47][48][49][50][51][52][53] the "island-bridge" design represents a widely used strategy, where the bridge-like deformable interconnects in the intermediate regions (i.e., trenches) between the island-like non-stretchable elements (e.g., commercial chips) provide the stretchability, due Island-bridge architectures represent a widely used structural design in stretchable inorganic electronics, where deformable interconnects that form the bridge provide system stretchability, and functional components that reside on the islands undergo negligible deformations. These device systems usually experience a common strain concentration phenomenon, i.e., "island effect", because of the modulus mismatch between the soft elastomer substrate and its on-top rigid components. Such an island effect can significantly raise the surrounding local strain, therefore increasing the risk of material failure for the interconnects in the vicinity of the islands. In this work, a systematic study of such an island effect through combined theoretical analysis, numerical simulations and experimental measurements is presented. To relieve the island effect, a buffer layer strategy is proposed as a generic route to enhanced stretchabilities of deformable interconnects. Both experimental and numerical results illustrate the applicability of this strategy to 2D serpentine and 3D helical interconnects, as evidenced by the increased stretchabilities (e.g., by 1.5 times with a simple buffer layer, and 2 times with a ring buffer layer, both for serpentine interconnects). The application of the patterned buffer layer strategy in a stretchable light emitting diodes system suggests promising potentials for uses in other functional device systems.

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“…With the continuous development of sensing technology, people have shown great demand for advanced flexible electronic devices [ 1 , 2 ]. Among them, flexible temperature sensors have attracted the attention of many specialists and scholars domestically and abroad in recent years due to their unique properties of high efficiency, seamless contact with the dynamic human body, continuity, and longterm temperature monitoring [ 3 , 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

A Flexible Temperature Sensor for Noncontact Human-Machine Interaction

et al. 2021

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Flexible sensors have attracted extensive attention because of their promising applications in the fields of health monitoring, intelligent robots, and electronic skin, etc. During the COVID-19 epidemic, noncontact control of public equipment such as elevators, game consoles, and doors has become particularly important, as it can effectively reduce the risk of cross-infection. In this work, a noncontact flexible temperature sensor is prepared via a simple dip-drying progress, in which poly(3,4-ethylenedioxythiophene):poly(4-styrene sulfonate) (PEDOT:PSS) and printer paper served as the sensing material and the flexible substrate, respectively. We combined the highly sensitive temperature-responsive property of PEDOT:PSS with the good hygroscopicity of printer paper. The prepared sensor shows high sensitivity and good stability in noncontact sensing mode within the temperature range of 20–50 °C. To prove the practicability of the noncontact temperature sensor, a 3 × 2 sensing array is prepared as a noncontact human-machine interface to realize the interaction between player and “Pound-A-Mole game” and a Bluetooth car. These two demos show the sensor′s ability to perceive nearby temperature changes, verifying its application potential as a noncontact human-machine interaction interface.

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An Anti‐Fatigue Design Strategy for 3D Ribbon‐Shaped Flexible Electronics

Cited by 30 publications

References 84 publications

Stretchable Electronic Facial Masks for Sonophoresis

Stretchable Electronic Facial Masks for Sonophoresis

Island Effect in Stretchable Inorganic Electronics

A Flexible Temperature Sensor for Noncontact Human-Machine Interaction

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