Programmable and scalable transfer printing with high reliability and efficiency for flexible inorganic electronics

Wang, Chengjun; Linghu, Changhong; Nie, Shuang; Li, Chenglong; Lei, Qianjin; Zhang, Xiang; Zeng, Yinjia; Du, Yipu; Zhang, Shun; Yu, Keke; Jin, Hao; Chen, Weiqiu; Song, Jizhou

doi:10.1126/sciadv.abb2393

Cited by 92 publications

(70 citation statements)

References 45 publications

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“…This overcomes the issues of nanomaterials' patterning limited in 2D planes. [30][31][32] Another challenge is to simultaneously achieve both a nonadhesive elastomeric surface and electrical conductivity to the liquid metal.…”

Section: Introductionmentioning

confidence: 99%

A Wearable Body Condition Sensor System with Wireless Feedback Alarm Functions

et al. 2021

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Emerging feedback systems based on tracking body conditions can save human lives. In particular, vulnerable populations such as disabled people, elderly, and infants often require special care. For example, the high global mortality of infants primarily owing to sudden infant death syndrome while sleeping makes request for extraordinary attentions in neonatal intensive care units or daily lives. Here, a versatile laser‐induced graphene (LIG)‐based integrated flexible sensor system, which can wirelessly monitor the sleeping postures, respiration rate, and diaper moisture with feedback alarm notifications, is reported. A tilt sensor based on confining a liquid metal droplet inside a cavity can track at least 18 slanting orientations. A rapid and scalable laser direct writing method realizes LIG patterning in both the in‐plane and out‐of‐plane configurations as well as the formation of nonstick conductive structures to the liquid metal. By rationally merging the LIG‐based tilt, strain, and humidity sensors on a thin flexible film, the multimodal sensor device is applied to a diaper as a real‐time feedback tracking system of the sleeping posture, respiration, and wetness toward secure and comfortable lives. User‐friendly interfaces, which incorporate alarming functions, provide timely feedback for caregivers tending to vulnerable populations with limited self‐care capabilities.

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Section: Introductionmentioning

confidence: 99%

A Wearable Body Condition Sensor System with Wireless Feedback Alarm Functions

et al. 2021

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“…[ 22 ] However, the scaling of the vacuum system down for chips with a lateral dimension smaller than 80 µm and a thickness thinner than 50 µm still remains a great challenge. [ 23 ] Advanced transfer printing techniques based on tunable adhesives regulated by controlling viscoelasticity, [ 27–31 ] surface microstructures, [ 32–35 ] and surface topography [ 36,37 ] have been developed for deterministic assembly of ultrathin micro‐devices. These tunable adhesives are very promising despite the limited strong/weak adhesion strength ratio (i.e., adhesion switchability) or weak pick‐up adhesion, which greatly limit their broad utilities.…”

Section: Introductionmentioning

confidence: 99%

Thermal Controlled Tunable Adhesive for Deterministic Assembly by Transfer Printing

Luo

Wang

et al. 2021

Adv Funct Materials

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Transfer printing techniques based on tunable adhesives that enable heterogeneous integration of materials in desired layouts are essential for developing existing and envisioned systems such as flexible electronics and micro‐LED (µ‐LED) displays. Here, a novel thermal controlled tunable adhesive, which not only has the ability of eliminating the interfacial adhesion for printing but also provides a new strategy for enhancing the interfacial adhesion for pick‐up is reported. The tunable adhesive features cavities filled with air on the surface. This simple construct offers thermal controlled suction and thrust with their amplitudes on the order of a few tens of kPa within 100 °C temperature change, which enables a reliable damage‐free transfer printing. Systematically theoretical and experimental studies reveal the underlying thermal induced pressure change mechanism and provide insights into the design and operation of the thermal controlled tunable adhesive. Demonstrations of this smart adhesive in manipulation of various surfaces and transfer printing of micro‐scale Si inks and µ‐LEDs illustrate its unusual capabilities for deterministic assembly by transfer printing.

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“…Recently, several in situ studies have been presented, revealing the load‐displacement responses of five table‐shaped 3D polymer mesostructures. [ 66,67 ] However, other commonly used material systems (e.g., metal and metal/polymer laminates [ 34,44,68 ] ) in 3D flexible electronics were not discussed in these works, [ 66,67 ] and no design principles or failure criteria have been proposed. Therefore, a systematic design strategy based on the comprehensive understanding of underlying failure mechanisms is highly desirable for 3D ribbon‐shaped flexible electronics.…”

Section: Introductionmentioning

confidence: 99%

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

Zhang

et al. 2021

Advanced Materials

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Three‐dimensional (3D) flexible electronics represent an emerging area of intensive attention in recent years, owing to their broad‐ranging applications in wearable electronics, flexible robots, tissue/cell scaffolds, among others. The widely adopted 3D conductive mesostructures in the functional device systems would inevitably undergo repetitive out‐of‐plane compressions during practical operations, and thus, anti‐fatigue design strategies are of great significance to improve the reliability of 3D flexible electronics. Previous studies mainly focused on the fatigue failure behavior of planar ribbon‐shaped geometries, while anti‐fatigue design strategies and predictive failure criteria addressing 3D ribbon‐shaped mesostructures are still lacking. This work demonstrates an anti‐fatigue strategy to significantly prolong the fatigue life of 3D ribbon‐shaped flexible electronics by switching the metal‐dominated failure to desired polymer‐dominated failure. Combined in situ measurements and computational studies allow the establishment of a failure criterion capable of accurately predicting fatigue lives under out‐of‐plane compressions, thereby providing useful guidelines for the design of anti‐fatigue mesostructures with diverse 3D geometries. Two mechanically reliable 3D devices, including a resistance‐type vibration sensor and a janus sensor capable of decoupled temperature measurements, serve as two demonstrative examples to highlight potential applications in long‐term health monitoring and human‐like robotic perception, respectively.

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Programmable and scalable transfer printing with high reliability and efficiency for flexible inorganic electronics

Cited by 92 publications

References 45 publications

A Wearable Body Condition Sensor System with Wireless Feedback Alarm Functions

A Wearable Body Condition Sensor System with Wireless Feedback Alarm Functions

Thermal Controlled Tunable Adhesive for Deterministic Assembly by Transfer Printing

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

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