Recent progresses on flexible tactile sensors

Wan, Yongbiao; Wang, Yan; Guo, Chuan Fei

doi:10.1016/j.mtphys.2017.06.002

Cited by 263 publications

(200 citation statements)

References 130 publications

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“…To provide tactile feedback, pressure sensors based on piezoelectric, resistive, or capacitive mechanisms are available. 12,[17][18][19] For targeted applications, capacitive pressure sensors are preferred due to the advantages of low sensitivity to temperature and relative humidity changes, low power consumption, high reproducibility, and static pressure detection capability. 18,20,21 The sensitivity of a capacitive sensor is tunable by adjusting the dielectric compressibility; for instance, the sensitivity is increased by choosing softer materials, i.e.…”

Section: Conceptual Insightsmentioning

confidence: 99%

Point-of-use robotic sensors for simultaneous pressure detection and chemical analysis

et al. 2019

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The development of sensors for monitoring hazardous materials in security and environmental applications has been increasing in the last few years. In particular, organophosphates pose a serious health threat that affects the food and agriculture industries. Hence, their rapid on-site detection is highly desired, especially through remote robotic sampling that can minimize the exposure of humans to these hazardous chemicals. To handle sample collection, a robotic manipulator requires tactile feedback, to ensure that no damage will be done to either the robot or the other object in contact due to excessive force. To provide tactile feedback, porous polydimethylsiloxane pressure sensors based on a capacitive mechanism were chosen here, and integrated with enzyme-based electrochemical sensors specific for organophosphate compounds (e.g. methyl paraoxon). This results in a hybrid physical-chemical sensing glove that can simultaneously measure the pressure and chemical target without interference between the two sensors. Our pressure sensors showed 455% relative capacitance change per 10 kPa applied pressure, with an average sensitivity (S) of 0.057 AE 0.004 kPa À1 in the 3-20 kPa range and a maximum sensitivity of 0.30 AE 0.08 kPa À1 in the o0.05 kPa range. The chemical biosensors showed a detection range of 20-180 lM for methyl paraoxon in the liquid phase. We have thus combined low-cost chemical and pressure sensors together on disposable, retrofitting gloves, and demonstrated simultaneous tactile sensing and organophosphate pesticide detection in a point-of-use robotic field platform that is scalable, economical, and adaptable for different security, environmental, and food-safety applications.

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Section: Conceptual Insightsmentioning

confidence: 99%

Point-of-use robotic sensors for simultaneous pressure detection and chemical analysis

et al. 2019

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“…Another type of spongy pressure sensor, such as reverse‐micelle‐induced porous pressure rubber and laser‐scribed graphene pressure sensor, can response to high pressure (≈100 kPa) but their sensitivities were very low (<1 kPa −1 ) and cannot detect the subtle pressure (<2 kPa) simultaneously. An idea flexible pressure sensor should keep a high‐sensitivity over a wide sensing range for perceiving various pressure, such as light respiration (<1 kPa), pulse pressure (1–10 kPa), pressure of object manipulation (10–100 kPa), and foot pressure (>200 kPa) . In addition to meeting actual needs, another important reason for maintaining a high sensitivity over a wide range is the inevitable additional pressure (from several Pa to several kPa) generated by the processes of packaging devices and affixing devices to the uneven epidermis.…”

Section: Introductionmentioning

confidence: 99%

Multilevel Microstructured Flexible Pressure Sensors with Ultrahigh Sensitivity and Ultrawide Pressure Range for Versatile Electronic Skins

Tang

Gan

et al. 2019

Small

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174

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Flexible pressure sensors as electronic skins have attracted wide attention to their potential applications for healthcare and intelligent robotics. However, the tradeoff between their sensitivity and pressure range restricts their practical applications in various healthcare fields. Herein, a cost‐effective flexible pressure sensor with an ultrahigh sensitivity over an ultrawide pressure‐range is developed by combining a sandpaper‐molded multilevel microstructured polydimethylsiloxane and a reduced oxide graphene film. The unique multilevel microstructure via a two‐step sandpaper‐molding method leads to an ultrahigh sensitivity (2.5–1051 kPa−1) and can detect subtle and large pressure over an ultrawide range (0.01–400 kPa), which covers the overall pressure regime in daily life. Sharp increases in the contact area and additional contact sites caused by the multilevel microstructures jointly contribute to such unprecedented performance, which is confirmed by in situ observation of the gap variations and the contact states of the sensor under different pressures. Examples of the flexible pressure sensors are shown in potential applications involving the detection of various human physiological signals, such as breathing rate, vocal‐cord vibration, heart rate, wrist pulse, and foot plantar pressure. Another object manipulation application is also demonstrated, where the material shows its great potential as electronic skin intelligent robotics and prosthetic limbs.

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“…Pressure‐sensitive electronic skin (e‐skin) has become important in the prosthetics, artificial intelligence, human–machine interaction, health monitoring, and soft robotics . E‐skin devices enable machines with tactile senses, e.g., “Co‐robots,” use e‐skin to friendly interact with human beings, working environment and other robots .…”

Section: Introductionmentioning

confidence: 99%

Piezocapacitive Flexible E‐Skin Pressure Sensors Having Magnetically Grown Microstructures

Asghar

Zhou

et al. 2020

Adv Materials Technologies

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Flexible pressure sensors are highly desirable in artificial intelligence, health monitoring, and soft robotics. Microstructuring of dielectrics is the common strategy employed to improve the performance of capacitive type pressure sensors. Herein, a novel, low‐cost, large‐area compatible, and mold‐free technique is reported in which magnetically grown microneedles are self‐assembled from a film of curable magnetorheological fluid (CMRF) under the influence of a vertical curing magnetic field (Bcuring). After optimizing the microneedles' fabrication parameters, i.e., magnetic particles' (MPs') concentration and Bcuring intensity, piezocapacitive sensors capable of wide range pressure sensing (0–145 kPa) with ultrafast response time (50 ms), high cyclic stability (>9000 cycles), as well as very low detection limit (1.9 Pa) are obtained. Sensor properties are found dependent on microneedles' fabrication parameters that are controllable, produce variable‐sized microneedles, and allow to govern sensing properties according to desired applications. Finally, the sensor is employed in holding a bottle with different weights, human breath, and motion monitoring, which demonstrate its great potential for the applications of human–machine interaction, human health monitoring, and intelligent soft robotics.

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Recent progresses on flexible tactile sensors

Cited by 263 publications

References 130 publications

Point-of-use robotic sensors for simultaneous pressure detection and chemical analysis

Point-of-use robotic sensors for simultaneous pressure detection and chemical analysis

Multilevel Microstructured Flexible Pressure Sensors with Ultrahigh Sensitivity and Ultrawide Pressure Range for Versatile Electronic Skins

Piezocapacitive Flexible E‐Skin Pressure Sensors Having Magnetically Grown Microstructures

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