Printed Flexible Strain Sensor Array for Bendable Interactive Surface

Li, Ming; Chen, Sujie; Fan, Boyu; Wu, Biao; Guo, Xiaojun

doi:10.1002/adfm.202003214

Cited by 84 publications

(68 citation statements)

References 34 publications

(32 reference statements)

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“…The distribution clearly shows two separate fractures and their shapes as the strain increases, as shown in Figure S14. When compared to previously reported strain-sensor arrays, − our device shows that all of 25 sensors and stretchable AgNW interconnects operate stably under various strain conditions and accurately analyze the strain distribution. For rigorously verifying the strain sensing capability, we also prepare DIC measurement samples with a bare PDMS substrate.…”

Section: Resultsmentioning

confidence: 76%

Stamp-Perforation-Inspired Micronotch for Selectively Tearing Fiber-Bridged Carbon Nanotube Thin Films and Its Applications for Strain Classification

Kim

Yoon

et al. 2021

ACS Appl. Mater. Interfaces

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Cracks typically deteriorate the structural and electrical properties of materials when not properly controlled. A few papers recently reported the controlling methods of crack formation in the brittle materials utilizing the lateral V-notch structure. For ductile materials, however, there have been few papers reporting cracking phenomenon, but full cracking control including predesigned initiation, propagation, and termination has not been reported yet. Therefore, we report a predesigned full cracking control in ductile conductive carbon nanotube (CNT) films by introducing inkjet-printed L-shape micronotch (LMN) structures inspired by directional stamp perforation marks. In spite of the high fracture toughness of CNT films, the LMNs determine locations of initial crack formation and guide crack propagation in a predesigned way. Selective connection of isolated cracks in the CNT film increases its resistance monotonically under tensile strain and thus tremendously well maintains high linearity (adj. R 2 value > 0.99) in resistance change over record large strain ranges of 0.01–100%, which enables us to quantitatively classify strain values accurately for previously reported practical body signals for the first time. We believe that our facile printing-based crack control strategy not only provides a comprehensive solution to various stretchable sensor applications but also builds a new milestone for cracking mechanism studies in fracture mechanics.

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Section: Resultsmentioning

confidence: 76%

Stamp-Perforation-Inspired Micronotch for Selectively Tearing Fiber-Bridged Carbon Nanotube Thin Films and Its Applications for Strain Classification

Kim

Yoon

et al. 2021

ACS Appl. Mater. Interfaces

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“…( C ) The photoimage of bendable interactive surface. Reproduced with the permission from [ 78 ], copyright the Wiley Online Library, 2020. ( D ) Optical image of the strain sensor array (5 × 5).…”

Section: Figurementioning

confidence: 99%

Materials, Electrical Performance, Mechanisms, Applications, and Manufacturing Approaches for Flexible Strain Sensors

Han

Chen

et al. 2021

Nanomaterials

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With the recent great progress made in flexible and wearable electronic materials, the upcoming next generation of skin-mountable and implantable smart devices holds extensive potential applications for the lifestyle modifying, including personalized health monitoring, human-machine interfaces, soft robots, and implantable biomedical devices. As a core member within the wearable electronics family, flexible strain sensors play an essential role in the structure design and functional optimization. To further enhance the stretchability, flexibility, sensitivity, and electricity performances of the flexible strain sensors, enormous efforts have been done covering the materials design, manufacturing approaches and various applications. Thus, this review summarizes the latest advances in flexible strain sensors over recent years from the material, application, and manufacturing strategies. Firstly, the critical parameters measuring the performances of flexible strain sensors and materials development contains different flexible substrates, new nano- and hybrid- materials are introduced. Then, the developed working mechanisms, theoretical analysis, and computational simulation are presented. Next, based on different material design, diverse applications including human motion detection and health monitoring, soft robotics and human-machine interface, implantable devices, and biomedical applications are highlighted. Finally, synthesis consideration of the massive production industry of flexible strain sensors in the future; different fabrication approaches that are fully expected are classified and discussed.

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“…Another novel structure that can improve the durability of the strain sensor is attaching a conductive layer (carbon black‐PDMS‐Ecoflex) on the top of the interface region between the soft strain sensing film (AgNWs‐PDMS) and rigid contact electrodes (Ag paste); this greatly decreases the local interface stress under strain. [ 108 ] Arrays of resultant sensors were integrated on the back of a flexible display (Figure 5c left) for an HMI application, where human gestures could help control a ball's movement on the display (Figure 5c right) because the bending‐induced resistance change signals were converted to pre‐set movement commands using a developed machine‐learning algorithm. This work could expand gesture‐recognition approaches for interactive AR/VR environments.…”

Section: Nanowire‐based Wearable Skin Sensory Input Interfacesmentioning

confidence: 99%

Section: Nanowire‐based Wearable Skin Sensory Input Interfacesmentioning

confidence: 99%

Nanowire‐Based Soft Wearable Human–Machine Interfaces for Future Virtual and Augmented Reality Applications

Wang

Yap

Gong

et al. 2021

Adv Funct Materials

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A virtual world has now become a reality as augmented reality (AR) and virtual reality (VR) technology become commercially available. Similar to how humans interact with the physical world, AR and VR systems rely on human–machine interface (HMI) sensors to interact with the virtual world. Currently, this is achieved via state of‐the‐art wearable visual and auditory tools that are rigid, bulky, and burdensome, thereby causing discomfort during practical application. To this end, a skin sensory interface has the potential to serve as the next‐generation AR/VR technology because skin‐like wearable sensors have advantages in that they can be ultrathin, ultra‐soft, conformal, and imperceptible, which provides the ultimate comfort and immersive experience for users. In this progress report, nanowire‐based soft wearable HMI sensors including acoustic, strain, pressure sensors, and physiological sensors are reviewed that may be adopted as skin sensory inputs in future AR/VR systems. Further, nanowire‐based soft contact lenses, haptic force, and thermal and vibration actuators are covered as potential means of feedback for future AR/VR systems. Considering the possible effects of the virtual world on human health, skin‐like wearable artery pulses, glucose, and lactate sensors are also described, which may enable imperceptible health monitoring during future AR/VR practices.

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Printed Flexible Strain Sensor Array for Bendable Interactive Surface

Cited by 84 publications

References 34 publications

Stamp-Perforation-Inspired Micronotch for Selectively Tearing Fiber-Bridged Carbon Nanotube Thin Films and Its Applications for Strain Classification

Stamp-Perforation-Inspired Micronotch for Selectively Tearing Fiber-Bridged Carbon Nanotube Thin Films and Its Applications for Strain Classification

Materials, Electrical Performance, Mechanisms, Applications, and Manufacturing Approaches for Flexible Strain Sensors

Nanowire‐Based Soft Wearable Human–Machine Interfaces for Future Virtual and Augmented Reality Applications

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