Fingerprint‐Inspired Flexible Tactile Sensor for Accurately Discerning Surface Texture

Cao, Yudong; Li, Tie; Gu, Yang; Luo, Hui; Wang, Shuqi; Zhang, Ting

doi:10.1002/smll.201703902

Cited by 200 publications

(151 citation statements)

References 37 publications

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“…Recently, benefited from the development of material science and manufacturing, many flexible tactile sensors have been realized based on different transduction mechanisms including capacitance, piezoelectricity, resistance, and triboelectricity . To increase the sensitivity of the sensor, microstructure have been introduced in many researches, such as pyramid, hemispheres, and micropillar . These pressure sensors have been reported with excellent performance, but if used in the soft robotics, more or less issues still exists.…”

Section: Introductionmentioning

confidence: 99%

High‐Performance Flexible Tactile Sensor Enabling Intelligent Haptic Perception for a Soft Prosthetic Hand

Liang

Cheng

Zhao

et al. 2019

Adv Materials Technologies

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Compared to the traditional motor‐driven prosthetic hand, a soft prosthetic hand (SPD) has intrisic advantages such as kinematics dexterity and friendly external interaction. In order for an SPD to realize the function of a real hand, the integration of flexible high‐performance tactile sensors is essential. Current research on flexible tactile sensors is mainly focused on increasing sensitivity, but ignores other issues, such as the complexity of arraying and compatibility with soft actuators. A high‐performance flexible force sensor enabling intelligent tactile perception for an SPD is reported. With the aid of reasonable arrangement of functional material and effective 3D structure design, the force sensor exhibits good linearity (R2 = 0.982), accuracy and repeatability, very low hysteresis, fast dynamical response (<1 ms), high stability (30000 loading–unloading cycles), stable performance under high frequency (>50 Hz), and can easily be arrayed and integrated with an SPD. With such a sensor mounted on its surface, an SPD achieves various complicated tasks in the same manner as a real hand, including feeling the softness of objects and imitating the process of traditional Chinese medicine pulse diagnosis to monitor a pulse wave in the radial artery. Finally, through use of a force‐sensor array, an SPD provides real‐time spatial distribution of pressure during the grabbing of objects.

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Section: Introductionmentioning

confidence: 99%

High‐Performance Flexible Tactile Sensor Enabling Intelligent Haptic Perception for a Soft Prosthetic Hand

Liang

Cheng

Zhao

et al. 2019

Adv Materials Technologies

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“…Reports on the use of PDMS as a dielectric in capacitive pressure sensors yield a sensitivity of 35.9 % N −1 in a small force range of 0-1 N (Ji et al, 2016). By incorporating metallic nanoparticles (Jain and Bhatia, 2016) like tungsten, iron, molybdenum and conductive nanowires (Wang, 2017) like the silver nanowire in PDMS, it demonstrates good pressure sensitivity compared to silicon-based pressure sensors and better pressure ranges up to 180 kPa. By means of soft lithography techniques, sensor dimensions of 15 µm (Cao et al, 2018) could be achieved.…”

Section: Introductionmentioning

confidence: 99%

“…By means of soft lithography techniques, sensor dimensions of 15 µm (Cao et al, 2018) could be achieved. Depending on the choice of nanofiller and measurement technique, the nanocomposite sensors work on either the piezo-resistive (Chen et al, 2017) or piezo-capacitive (Emon et al, 2017) principle. Carbonbased materials like pressure sensors are fabricated in different forms, such as sandwiched structure (Cui et al, 2016) or as arrays (Li et al, 2017) with fast response time < 200 ms. Pressure sensors based on graphite, CNT yarns, do not contain any polymer matrix and have advantages of being low cost, being biodegradable and having simple fabrication techniques, but they exhibit limitations with detectable pressure, either greater than 300 kPa in the case of graphite-based sensors or less than 60 kPa in the case of CNT yarns .…”

Section: Introductionmentioning

confidence: 99%

Highly sensitive capacitive pressure sensors for robotic applications based on carbon nanotubes and PDMS polymer nanocomposite

Ramalingame

Lakshmanan

Müller

et al. 2019

J. Sens. Sens. Syst.

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Flexible tactile pressure sensor arrays based on multiwalled carbon nanotubes (MWCNT) and polydimethylsiloxane (PDMS) are gaining importance, especially in the field of robotics because of the high demand for stable, flexible and sensitive sensors. Some existing concepts of pressure sensors based on nanocomposites exhibit complicated fabrication techniques and better sensitivity than the conventional pressure sensors. In this article, we propose a nanocomposite-based pressure sensor that exhibits a high sensitivity of 25 % N −1 , starting with a minimum load range of 0-0.01 N and 46.8 % N −1 in the range of 0-1 N. The maximum pressure sensing range of the sensor is approximately 570 kPa. A concept of a 4 × 3 tactile sensor array, which could be integrated to robot fingers, is demonstrated. The high sensitivity of the pressure sensor enables precision grasping, with the ability to sense small objects with a size of 5 mm and a weight of 1 g. Another application of the pressure sensor is demonstrated as a gait analysis for humanoid robots. The pressure sensor is integrated under the foot of a humanoid robot to monitor and evaluate the gait of the robot, which provides insights for optimizing the robot's self-balancing algorithm in order to maintain the posture while walking.

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“…In particular, piezoresistive sensors, which can transform a variety of pressure signals into a variety of resistance signals, show key advantages, such as high accuracy, simple signal collection and economical manufacturing. In previous work [20][21][22], many researchers have focused on increasing pressure sensor sensitivity, rather than on increasing the pressure range of an individual sensor. In order to fully realize human body monitoring including pulse detection, voice recognition, wrist movement, and so on, the flexible pressure sensors need to possess not only a high sensitivity but also a wide pressure range [3][4][5], from a few Pa to tens of thousands of Pa [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

“…Sensitive materials and structures are the two vital factors affecting the performance of pressure sensors. Generally, sensitive materials such as graphene [26][27][28], carbon nanotubes (CNTs) [20][21][22], metal nanoparticles [29,30], conductive nanowires [31][32][33], and organic polymers [34] are used in flexible sensors because they can be easily attached to the surfaces of flexible substrates or mixed into stretchable polymer. Among these materials, CNT has attracted a great deal of interest due to its remarkable electronic properties [35,36].…”

Section: Introductionmentioning

confidence: 99%

An ultra-sensitive and wide measuring range pressure sensor with paper-based CNT film/interdigitated structure

et al. 2019

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Flexible pressure sensors have attracted great attention due to their potential in the wearable devices market and in particular in human-machine interactive interfaces. Pressure sensors with high sensitivity, wide measurement range, and low-cost are now highly desired for such practical applications. In the present investigation, an ultrasensitive pressure sensor with wide measurement range has been successfully fabricated. Carbon nanotubes (CNTs) (uniformly sprayed on the surface of paper) comprise the sensitivity material, while lithographed interdigital electrodes comprise the substrate. Due to the synergistic effects of CNT's high specific surface area, paper's porous structure, interdigital electrodes' efficient contact with CNT, our pressure sensor realizes a wide measurement range from 0 to 140 kPa and exhibits excellent stability through 15,000 cycles of testing. For the paper-based CNT film/interdigitated structure (PCI) pressure sensor, the connection area between the sensitive material and interdigital electrodes dominates in the lowpressure region, while internal change within the sensitive materials plays the leading role in the high-pressure region. Additionally, the PCI pressure sensor not only displays a high sensitivity of 2.72 kPa-1 (up to 35 kPa) but also can detect low pressures, such as that exerted by a resting mung bean (about 8 Pa). When attached to the surface of a human body, the pressure sensor can monitor physiological signals, such as wrist movement, pulse beats, or movement of throat muscles. Furthermore, the pressure sensor array can identify the spatial pressure distribution, with promising applications in humanmachine interactive interfaces.

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Fingerprint‐Inspired Flexible Tactile Sensor for Accurately Discerning Surface Texture

Cited by 200 publications

References 37 publications

High‐Performance Flexible Tactile Sensor Enabling Intelligent Haptic Perception for a Soft Prosthetic Hand

High‐Performance Flexible Tactile Sensor Enabling Intelligent Haptic Perception for a Soft Prosthetic Hand

Highly sensitive capacitive pressure sensors for robotic applications based on carbon nanotubes and PDMS polymer nanocomposite

An ultra-sensitive and wide measuring range pressure sensor with paper-based CNT film/interdigitated structure

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