Flexible, Highly Sensitive, and Ultrafast Responsive Pressure Sensor with Stochastic Microstructures for Human Health Monitoring

Zhang, Xinyu; Chen, Fei; Han, Li; Zhang, Gang; Hu, Yougen; Jiang, Wenlong; Zhu, Pengli; Sun, Rong; Wong, Ching‐Ping

doi:10.1002/adem.202000902

Cited by 23 publications

(13 citation statements)

References 50 publications

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“…[14][15][16] Usually, conductive fillers such as carbon nanotubes sensitivity of the piezoresistive sensor depends on the microstructure of the porous CNTs. 44,58,59 The sheet resistance of BLA CNTs decreases with increasing BL exposure energy, as shown in Fig. 1h, from 955 ohm sq -1 to less than 490 ohm sq -1 when the BL energy density increases to 5.06 J cm -2 .…”

Section: Introductionmentioning

confidence: 89%

Highly Sensitive, Ultra-Thin Dynamic Lateral Pressure Sensor Using Blue Laser Exposed Porous CNTs

Jang

Park

Choi

et al. 2022

Preprint

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Piezoresistive sensor is an essential component of wearable electronics that can detect resistance changes when pressure is applied. An effective approach to enhance its performance is to make micro-structured device. In this paper, porous carbon nanotubes (CNTs) are formed by blue laser (BL) exposure on CNTs layer, which increases its thickness ~4 times compared to the as-deposited layer. Then, the pressure sensor is fabricated by spin coating of styrene-ethylene-butylene-styrene (SEBS) elastomer on the porous CNTs layer. A 1.32 µm thick pressure sensor exhibits a high sensitivity of 6.54 x 106 kPa-1, a wide sensing range of 278 Pa ~ 40 kPa, and fast response/recovery times of 900/760 µs, respectively. The stability of the pressure sensor is demonstrated by repeated loading and unloading of 20 kPa for 3600 cycles. The stretchable pressure sensor was also demonstrated using lateral CNT electrodes on SEBS surface, exhibiting stable pressure performance up to 20% stretching. Finally, a 32 x 32 active-matrix pressure sensor array is demonstrated consisting of amorphous InGaZnO4 thin-film transistor (TFT) backplane for pressure mapping and real-time monitoring. The sensor array demonstrates dynamic area touch by pen writing with ~1 cm/s speed.

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Section: Introductionmentioning

confidence: 89%

Highly Sensitive, Ultra-Thin Dynamic Lateral Pressure Sensor Using Blue Laser Exposed Porous CNTs

Jang

Park

Choi

et al. 2022

Preprint

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“…This microstructure can be copied from the surface of other materials or obtained through simple operations, and the cost of production is relatively low. Common random microstructures can be obtained directly or indirectly from fabrics [ 81 ], plants [ 82 , 83 ], and sandpaper [ 84 , 85 ].…”

Section: Fundamental Designs Of Flexible Pressure Sensorsmentioning

confidence: 99%

Force-Sensitive Interface Engineering in Flexible Pressure Sensors: A Review

Tai

Wei

et al. 2022

Sensors

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Flexible pressure sensors have received extensive attention in recent years due to their great importance in intelligent electronic devices. In order to improve the sensing performance of flexible pressure sensors, researchers are committed to making improvements in device materials, force-sensitive interfaces, and device structures. This paper focuses on the force-sensitive interface engineering of the device, which listing the main preparation methods of various force-sensitive interface microstructures and describing their respective advantages and disadvantages from the working mechanisms and practical applications of the flexible pressure sensor. What is more, the device structures of the flexible pressure sensor are investigated with the regular and irregular force-sensitive interface and accordingly the influences of different device structures on the performance are discussed. Finally, we not only summarize diverse practical applications of the existing flexible pressure sensors controlled by the force-sensitive interface but also briefly discuss some existing problems and future prospects of how to improve the device performance through the adjustment of the force-sensitive interface.

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“…With the improvements of the nanoscale devices, the use of flexible sensors shows immense potential to be utilized for healthcare, pervasive care, and industrial applications for efficient collection of data [ 78 ]. To this end, the applications of printed flexible sensors have been increased to use in human emotion recognition due to its certain advantages, e.g., low cost of fabrication, enhanced electrical and mechanical attributes, multifunctionality as well as the resolution [ 79 , 80 , 81 ]. Furthermore, the application of wearable flexible electronics [ 82 ] and affinity flexible biosensors [ 83 ] have been of great interest to collect human emotional data over the past years.…”

Section: Sensors For Human Emotion Recognitionmentioning

confidence: 99%

Development and Progress in Sensors and Technologies for Human Emotion Recognition

Pal

Mukhopadhyay

Suryadevara

2021

Sensors

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With the advancement of human-computer interaction, robotics, and especially humanoid robots, there is an increasing trend for human-to-human communications over online platforms (e.g., zoom). This has become more significant in recent years due to the Covid-19 pandemic situation. The increased use of online platforms for communication signifies the need to build efficient and more interactive human emotion recognition systems. In a human emotion recognition system, the physiological signals of human beings are collected, analyzed, and processed with the help of dedicated learning techniques and algorithms. With the proliferation of emerging technologies, e.g., the Internet of Things (IoT), future Internet, and artificial intelligence, there is a high demand for building scalable, robust, efficient, and trustworthy human recognition systems. In this paper, we present the development and progress in sensors and technologies to detect human emotions. We review the state-of-the-art sensors used for human emotion recognition and different types of activity monitoring. We present the design challenges and provide practical references of such human emotion recognition systems in the real world. Finally, we discuss the current trends in applications and explore the future research directions to address issues, e.g., scalability, security, trust, privacy, transparency, and decentralization.

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Flexible, Highly Sensitive, and Ultrafast Responsive Pressure Sensor with Stochastic Microstructures for Human Health Monitoring

Cited by 23 publications

References 50 publications

Highly Sensitive, Ultra-Thin Dynamic Lateral Pressure Sensor Using Blue Laser Exposed Porous CNTs

Highly Sensitive, Ultra-Thin Dynamic Lateral Pressure Sensor Using Blue Laser Exposed Porous CNTs

Force-Sensitive Interface Engineering in Flexible Pressure Sensors: A Review

Development and Progress in Sensors and Technologies for Human Emotion Recognition

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