Superhydrophobic gradient wrinkle strain sensor with ultra-high sensitivity and broad strain range for motion monitoring

Chu, Zhenming; Jiao, Weicheng; Huang, Yifan; Zheng, Yongting; Wang, Rongguo; He, Xiaodong

doi:10.1039/d0ta11959h

Cited by 89 publications

(69 citation statements)

References 56 publications

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“…By transferring a prestrained elastomer substrate of vertically aligned CNT (VACNT) bundles and subsequently densifying them, we successfully developed a 3D hierarchical structure for the tactile sensor. Although the prestraining technique to make the wrinkled surface was presented various flexible electronics such as strain sensors, tactile sensors, and stretchable electrodes, [ 42–47 ] our work is the first study to demonstrate a tactile sensor with a 3D hierarchical structure with CNT bundles through a transfer and densification process. The fabricated sensor achieved remarkable sensing performances with ultrahigh sensitivity (141.72 kPa −1 at a pressure range of 0.01–40 kPa) and a wide sensing range (0–100 kPa).…”

Section: Introductionmentioning

confidence: 99%

Highly Sensitive Flexible Tactile Sensors in Wide Sensing Range Enabled by Hierarchical Topography of Biaxially Strained and Capillary‐Densified Carbon Nanotube Bundles

Sim

Kang

et al. 2021

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Flexible tactile sensors with high sensitivity have received considerable attention for their use in wearable electronics, human–machine interfaces, and health‐monitoring devices. Although various micro/nanostructured materials are introduced for high‐performance tactile sensors, simultaneously obtaining high sensitivity and a wide sensing range remains challenging. Here, a resistive tactile sensor is presented based on the hierarchical topography of carbon nanotubes (CNTs) prepared by a low‐cost and straightforward manufacturing process. The 3D hierarchical structure of the CNTs over large areas is formed by transferring vertically aligned CNT bundles to a prestrained elastomer substrate and subsequently densifying them through capillary forming, providing a monotonic increase in the contact area as applied pressure. The deformable and hierarchical structure of CNTs allows the sensor to exhibit a wide sensing range (0–100 kPa), high sensitivity (141.72 kPa−1), and low detection limit (10 Pa). Additionally, the capillary‐formed CNT structure results in increased durability of the sensor over repeated pressures. Based on these advantages, meaningful applications of tactile sensors, such as object recognition gloves and multidirectional force perceptions, are successfully realized. Given the scalable fabrication method, 3D hierarchically structured CNTs provide an essential step toward next‐generation wearable devices.

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Section: Introductionmentioning

confidence: 99%

Highly Sensitive Flexible Tactile Sensors in Wide Sensing Range Enabled by Hierarchical Topography of Biaxially Strained and Capillary‐Densified Carbon Nanotube Bundles

Sim

Kang

et al. 2021

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“…So far, a lot of work has been carried out on the developing and research of TMSs to improve the sensing performance of the devices, such as sensitivity, response range, response time, stability, etc., because these properties determine the practical application capabilities of the sensors [75]. Sensing performance can be improved by introducing special geometric structures, such as microarrays [76,77], microcracks [78], micropatterns [79,80], pleated structures [81,82], porous structures [83,84], spiral structures [85,86], etc. The innovation of materials is also a major key point to improve the sensing performance.…”

Section: Performancementioning

confidence: 99%

Textile-Based Mechanical Sensors: A Review

et al. 2021

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Innovations related to textiles-based sensors have drawn great interest due to their outstanding merits of flexibility, comfort, low cost, and wearability. Textile-based sensors are often tied to certain parts of the human body to collect mechanical, physical, and chemical stimuli to identify and record human health and exercise. Until now, much research and review work has been carried out to summarize and promote the development of textile-based sensors. As a feature, we focus on textile-based mechanical sensors (TMSs), especially on their advantages and the way they achieve performance optimizations in this review. We first adopt a novel approach to introduce different kinds of TMSs by combining sensing mechanisms, textile structure, and novel fabricating strategies for implementing TMSs and focusing on critical performance criteria such as sensitivity, response range, response time, and stability. Next, we summarize their great advantages over other flexible sensors, and their potential applications in health monitoring, motion recognition, and human-machine interaction. Finally, we present the challenges and prospects to provide meaningful guidelines and directions for future research. The TMSs play an important role in promoting the development of the emerging Internet of Things, which can make health monitoring and everyday objects connect more smartly, conveniently, and comfortably efficiently in a wearable way in the coming years.

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“…[16][17][18][19] The accurate detection of subtle muscle and skin motions requires a high gauge factor (GF), while a large sensing range is needed for monitoring joint movements. [20][21][22] However, it is challenging to achieve high sensitivity and large stretchability simultaneously in strain sensors.…”

Section: Introductionmentioning

confidence: 99%

Ultrasensitive and highly stretchable fibers with dual conductive microstructural sheaths for human motion and micro vibration sensing

et al. 2022

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Superhydrophobic gradient wrinkle strain sensor with ultra-high sensitivity and broad strain range for motion monitoring

Abstract: Flexible strain sensors have potential applications in electronic skin, healthcare monitor, human-machine interface, and other fields. The key limitation of the strain sensor for human motion monitoring is to meet...

Cited by 89 publications

References 56 publications

Highly Sensitive Flexible Tactile Sensors in Wide Sensing Range Enabled by Hierarchical Topography of Biaxially Strained and Capillary‐Densified Carbon Nanotube Bundles

Highly Sensitive Flexible Tactile Sensors in Wide Sensing Range Enabled by Hierarchical Topography of Biaxially Strained and Capillary‐Densified Carbon Nanotube Bundles

Textile-Based Mechanical Sensors: A Review

Ultrasensitive and highly stretchable fibers with dual conductive microstructural sheaths for human motion and micro vibration sensing

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