Multimodal Fibrous Static and Dynamic Tactile Sensor

Abstract

A highly versatile, low-cost, and robust tactile sensor capable of acquiring load measurements under static and dynamic modes employing a poly(vinylidene fluoride-co-trifluoroethylene) [P(VDF-TrFE)] micronanofiber element is presented. The sensor is comprised of three essential layers, a fibrous core P(VDF-TrFE) layer and two Ni/Cu conductive fabric electrode layers, with a total thickness of less than 300 μm. Using an in situ electrospinning process, the core fibers are deposited directly to a soft poly(dimethylsiloxane) (PDMS) fingertip. The core layer conforms to the surface and requires no additional processing, exhibiting the capability of the in situ electrospinning fabrication method to alleviate poor surface contacts and resolve issues associated with adhesion. The fabricated tactile sensor displayed a reliable and consistent measurement performance of static and instantaneous dynamic loads over a total of 30 000 test cycles. The capabilities and implications of the presented tactile sensor design for multimodal sensing in robot tactile sensing applications is further discussed and elucidated.

Multimodal force and temperature tactile sensor based on a short-channel organic transistor with high sensitivity

“…Also in this case, the fabricated sensors are characterized by a sensitivity which is significantly higher than what previously reported in the literature. Fastier-Wooller et al 25 , for instance, have reported a sensitivity around 2.55% N –1 , whereas the highest sensitivity we reported in planar sensors was around 35 nA/N 37 .…”

“…The multimodal tactile sensor provides ultrasensitive pressure and temperature detection capability (2.2 V·kPa −1 , 0.27 nA·°C −1 ) over a broad range of 0.1–98 kPa for the pressure and − 20 to 30 °C for the temperature. A similar structure, still based on chemically modified piezoelectric thin films, have been reported by Fastier-Wooller et al for the fabrication of tactile sensors for robotic applications capable of discriminating between dynamic and static pressure events 24 , 25 , while Park and co-authors 26 developed a fingertip skin–inspired microstructured ferroelectric skins for the detection of static/dynamic pressure stimuli and temperature variations. Recently, You et al have developed a deformable ionic-based receptor that can distinguish simultaneously spatial profiles of temperature and strain without signal interference 27 .…”

Flexible Iron-On Sensor Embedded in Smart Sock for Gait Event Detection

“…An illustration of the electrospinning process is provided in Figure (top). Further information on the piezoelectric material and its fabrication process can be found in references and .…”

One Novel Hybrid Flexible Piezoresistive/Piezoelectric Double-Mode Sensor Design for Water Leakage Monitoring

“…The piezoresistive sensor is widely used as a pressure sensor due to its simple structure and convenient signal processing. ,, However, it is limited by the singular output signal and is unable to cope with more complex application scenarios. While the piezoelectric sensor is unsuitable for static testing, , its satisfactory dynamic response performance , can supplement information. Adopting a double-mode approach is an effective strategy for enhancing the sensing range, accuracy, and functionality of pressure sensors.…”