Pressure Sensors: Highly Sensitive Conformal Pressure Sensing Coatings Based on Thermally Expandable Microspheres (Adv. Mater. Technol. 5/2020)

Shao, Tianyu; Wu, Jianing; Zhang, Yuhan; Cheng, Yuanrong; Zuo, Zhengqing; Lv, Hongkun; Ying, Mingliang; Wong, Ching‐Ping; Li, Zhuo

doi:10.1002/admt.202070027

Cited by 7 publications

(15 citation statements)

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“…Moreover, the maximum withstandable pressure limits (i.e., yield strength, the amount of pressure that the sensor can endure without permanent change) are 460 kPa in the soft mode and 7.43 MPa in the rigid mode (Figure S8, Supporting Information). Considering that the pressure applied by a moving motorcycle (weighing about 170 kg) is 3.5 MPa, [ 72 ] it is obvious that our tunable sensor is mechanically robust. Our GM‐TPS achieves significantly higher sensitivity and a broader dynamic range through mode conversion, compared to state‐of‐the‐art capacitive sensors with a dynamic range of larger than 3 kPa (Figure 3f).…”

Section: Resultsmentioning

confidence: 99%

“…Our GM‐TPS achieves significantly higher sensitivity and a broader dynamic range through mode conversion, compared to state‐of‐the‐art capacitive sensors with a dynamic range of larger than 3 kPa (Figure 3f). [ 23,58,64,72–88 ] In the soft mode, the sensor has sensitivity of 16.97 kPa −1 within 0–1 kPa, 7.57 kPa −1 within 1–5 kPa, 2.47 kPa −1 within 5–10 kPa, 1.42 kPa −1 within 10–20 kPa, and 0.31 kPa −1 within 20–50 kPa. This result reveals that compared to reported contemporary sensors, our sensor has significantly higher sensitivity in the lower pressure range of 0–10 kPa, especially achieving a 452% improvement over the highest sensitivity of the state‐of‐the‐art sensors (3.13 kPa −1 ) in the 0–1 kPa range.…”

Section: Resultsmentioning

confidence: 99%

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Beyond Human Touch Perception: An Adaptive Robotic Skin Based on Gallium Microgranules for Pressure Sensory Augmentation

et al. 2022

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Robotic skin with human‐skin‐like sensing ability holds immense potential in various fields such as robotics, prosthetics, healthcare, and industries. To catch up with human skin, numerous studies are underway on pressure sensors integrated on robotic skin to improve the sensitivity and detection range. However, due to the trade‐off between them, existing pressure sensors have achieved only a single aspect, either high sensitivity or wide bandwidth. Here, an adaptive robotic skin is proposed that has both high sensitivity and broad bandwidth with an augmented pressure sensing ability beyond the human skin. A key for the adaptive robotic skin is a tunable pressure sensor built with uniform gallium microgranules embedded in an elastomer, which provides large tuning of the sensitivity and the bandwidth, excellent sensor‐to‐sensor uniformity, and high reliability. Through the mode conversion based on the solid–liquid phase transition of gallium microgranules, the sensor provides 97% higher sensitivity (16.97 kPa−1) in the soft mode and 262.5% wider bandwidth (≈1.45 MPa) in the rigid mode compared to the human skin. Successful demonstration of the adaptive robotic skin verifies its capabilities in sensing a wide spectrum of pressures ranging from subtle blood pulsation to body weight, suggesting broad use for various applications.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Beyond Human Touch Perception: An Adaptive Robotic Skin Based on Gallium Microgranules for Pressure Sensory Augmentation

et al. 2022

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“…Nevertheless, the sensitivity is relatively small, hence it is difficult to monitor subtle movements in human activities. [ 33–38 ] Human physical activities are diverse, thus, sensors with different ranges and sensitivity are required to thoroughly monitor all kinds of activities. [ 39 ] In addition to the aforementioned drawbacks, existing pressure sensors are cumbersome to manufacture and utilize expensive materials, which is a major limitation to their development.…”

Section: Introductionmentioning

confidence: 99%

Biologically Emulated Flexible Sensors With High Sensitivity and Low Hysteresis: Toward Electronic Skin to a Sense of Touch

Guo

Zhou

Hong

et al. 2022

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Recently, flexible pressure sensors (FPSs) have attracted intensive attention owing to their ability to mimic and function as electronic skin. Some sensors are exploited with a biological structure dielectric layer for high sensitivity and detection. However, traditional sensors with bionic structures usually suffer from a limited range for high‐pressure scenes due to their high sensitivity and high hysteresis in the medium pressure range. Here, a reconfigurable flea bionic structure FPS based on 3D printing technology, which can meet the needs of different scenes via tailoring of the dedicated structural parameters, is proposed. FPS exhibits high sensitivity (1.005 kPa−1 in 0–1 kPa), wide detection range (200 kPa), high repeatability (6000 cycles in 10 kPa), low hysteresis (1.3%), fast response time (40 ms), and very low detection limit (0.5 Pa). Aiming at practical application implementation, FPS has been correspondingly placed on a finger, elbow, arm, neck, cheek, and manipulators to detect the actions of various body parts, suggestive of excellent applicability. It is also integrated to make a flexible 3 × 3 sensor array for detecting spatial pressure distribution. The results indicate that FPS exhibits a significant application potential in advanced biological wearable technologies, such as human motion monitoring.

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“…Improvement of the sensitivity of capacitive pressure sensors is achieved by various strategies. These include the use of micropatterned dielectric layers or electrode surfaces, [ 31 ] nanofibrous membranes, [ 6,33 ] dielectric layers with microspheres [ 34,35 ] and ionic‐liquid active dielectric layers. [ 36–38 ] The capacitive pressure sensors based on micro/nano patterned or ionic‐liquid activated structures show promising sensitivity and quick response to external stimuli.…”

Section: Introductionmentioning

confidence: 99%

Seamless Monolithic Design for Foam Based, Flexible, Parallel Plate Capacitive Sensors

Çiçek

Doğanay

Durukan

et al. 2021

Adv Materials Technologies

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range, low power consumption, cycling stability and fast response make capacitive sensors promising candidates for wearable electronics. [27][28][29][30] It was demonstrated that the capacitive pressure sensors can be attached or carried by the human body for human-machine interface. Alternatively, they can be used for collecting physiological signals for real-time healthcare monitoring. However, commercialized or recently developed capacitive pressure sensors are mainly composed of planar separate electrodes, [31,32] which lead to user movement restriction and aesthetic loss. In addition, rigid planar structure restricts the breathability of the body and disrupts user comfort during long periods of use. Wearable capacitive pressure sensors are desired to be designed as a comfortable platform while providing high sensitivity with a low-pressure detection ability and long-term durability. They should also minimize additional weight and physical constraints on the human body in motion.Improvement of the sensitivity of capacitive pressure sensors is achieved by various strategies. These include the use of micropatterned dielectric layers or electrode surfaces, [31] nanofibrous membranes, [6,33] dielectric layers with microspheres [34,35] and ionic-liquid active dielectric layers. [36][37][38] The capacitive pressure sensors based on micro/nano patterned or ionic-liquid activated structures show promising sensitivity and quick response to external stimuli. These methods are time consuming, expensive and involve complicated production steps, such as electrospinning, etching and photolithography. Alternatively, foam-like structures with a wide variety of polymeric materials like polyelefin, [39] polyurethane, [40] ecoflex, [41] and polydimethylsiloxane (PDMS) [42] can be used in wearable electronics. They are cost-effective, commercially available and can be used for large scale-fabrication. Porous structure of these dielectric layers allows capacitive pressure sensors to detect low-pressures and have high sensitivity. For example, Teo and co-workers have demonstrated a capacitive pressure sensor with a dielectric layer made by boron nitride/PDMS foam and verified that 3D network structure can detect very low-pressures (<1 Pa). [42] Park and co-workers have showed a capacitive pressure sensor from 3D microporous dielectric layer sandwiched between carbon nanotube -ecoflex electrode layers with a Capacitive pressure sensors received significant attention in line with advancements in wearable electronics. However, in the era of the wearable electronics, fabricated sensors fail to fulfill the absolute requirements. Significant portion of the previously reported capacitive pressure sensors suffer from excessive weight, lack of air permeability, and washing stability due to the use of separate electrode layers. A low-cost, lightweight, parallel plate capacitive sensor with a unique seamless monolithic design that allows sensors to circumvent aforementioned problems is hereby demonstrated. The seamless monolithic capacitive ...

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Pressure Sensors: Highly Sensitive Conformal Pressure Sensing Coatings Based on Thermally Expandable Microspheres (Adv. Mater. Technol. 5/2020)

Cited by 7 publications

References 0 publications

Beyond Human Touch Perception: An Adaptive Robotic Skin Based on Gallium Microgranules for Pressure Sensory Augmentation

Beyond Human Touch Perception: An Adaptive Robotic Skin Based on Gallium Microgranules for Pressure Sensory Augmentation

Biologically Emulated Flexible Sensors With High Sensitivity and Low Hysteresis: Toward Electronic Skin to a Sense of Touch

Seamless Monolithic Design for Foam Based, Flexible, Parallel Plate Capacitive Sensors

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