A flexible dual-function capacitive sensor enhanced by loop-patterned fibrous electrode and doped dielectric pillars for spatial perception

Luo, Yongsong; Chen, Xiaoliang; Li, Xiangming; Tian, Hongmiao; Wang, Liang; Li, Xiangming

doi:10.1007/s12274-022-5309-z

Cited by 11 publications

(7 citation statements)

References 34 publications

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“…Depending on the sensitive mechanism, most flexible pressure sensors are based on piezoresistive 16 – 18 , piezoelectric 19 – 21 , capacitive 22 – 24 , electromagnetic 25 – 27 or triboelectric effects 28 – 30 , which rely on reliable material selection, well-crafted sensor structural design and advanced manufacturing to achieve wide sensing ranges and miniaturization. Simultaneously, arrays are frequently employed as sensing units in the quest for detecting multidimensional forces, leading to inherent challenges such as multiple electrodes and complex wiring connection problems, in addition to the potential issue of signal crosstalk.…”

Section: Introductionmentioning

confidence: 99%

Flexible wide-range multidimensional force sensors inspired by bones embedded in muscle

Zhang,

Hou,

Qian

et al. 2024

Microsyst Nanoeng

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Flexible sensors have been widely studied for use in motion monitoring, human‒machine interactions (HMIs), personalized medicine, and soft intelligent robots. However, their practical application is limited by their low output performance, narrow measuring range, and unidirectional force detection. Here, to achieve flexibility and high performance simultaneously, we developed a flexible wide-range multidimensional force sensor (FWMFS) similar to bones embedded in muscle structures. The adjustable magnetic field endows the FWMFS with multidimensional perception for detecting forces in different directions. The multilayer stacked coils significantly improved the output from the μV to the mV level while ensuring FWMFS miniaturization. The optimized FWMFS exhibited a high voltage sensitivity of 0.227 mV/N (0.5–8.4 N) and 0.047 mV/N (8.4–60 N) in response to normal forces ranging from 0.5 N to 60 N and could detect lateral forces ranging from 0.2–1.1 N and voltage sensitivities of 1.039 mV/N (0.2–0.5 N) and 0.194 mV/N (0.5–1.1 N). In terms of normal force measurements, the FWMFS can monitor finger pressure and sliding trajectories in response to finger taps, as well as measure plantar pressure for assessing human movement. The plantar pressure signals of five human movements collected by the FWMFS were analyzed using the k-nearest neighbors classification algorithm, which achieved a recognition accuracy of 92%. Additionally, an artificial intelligence biometric authentication system is being developed that classifies and recognizes user passwords. Based on the lateral force measurement ability of the FWMFS, the direction of ball movement can be distinguished, and communication systems such as Morse Code can be expanded. This research has significant potential in intelligent sensing and personalized spatial recognition.

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Section: Introductionmentioning

confidence: 99%

Flexible wide-range multidimensional force sensors inspired by bones embedded in muscle

Zhang,

Hou,

Qian

et al. 2024

Microsyst Nanoeng

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“…Recently, electronic skin (e-skin) incorporating proximity and pressure sensing modalities has attracted increasing attention in robotics [6]. Current proximity-detection strategies are mainly based on capacitive [6], optical [7], radar [8], and triboelectric [9] mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Bioinspired electronic-skin for proximity and pressure detection in robot active sensing

Li,

Yang,

et al. 2024

Flex. Print. Electron.

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Active sensing technology plays an essential role in environment–robot interactions. Inspired by the proximity sensing approach of weakly electric fish, which relies on distributed electroreceptors capable of detecting electric fields, we propose a flexible electronic skin (e-skin) or proximity and pressure detection. Conductive thermoplastic polyurethane and dielectric polyurethane are employed for flexible electrodes and substrates, respectively. An ecoflex-based elastic layer enables decoupling proximity and pressure information from the electric field. The proposed electronic skin can detect objects as far as 160 mm while performing real-time proximity and pressure sensing. Finally, we demonstrate that robots equipped with the e-skin can easily explore their surroundings and perform specific tasks such as recognition, avoidance, and grasping. The developed e-skin, with proximity and pressure-sensing capabilities and a low-cost fabrication process, can have broad application potential in robot active sensing.

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“…[15,[22][23][24][25][26][27][28][29][30][31][32] Generally, the detection of triboelectric sensors is based on the transient output signals, while the detection of the capacitive and organic semiconductorbased proximity sensors is based on the steady-state output signals. The conventional capacitive proximity sensor applies the parallel plate capacitor that mainly be used to detect metal or conductor, [33][34][35][36][37][38] and the organic semiconductor-based sensor generally applies the coplanar pair electrodes to connect the organic semiconductor that can detect the charged objects. [18,[39][40][41][42][43] Because of the unintentionally electrically charged characteristic of insulators, the organic semiconductor-based sensor offers the capability to sensitively detect the insulator, for example, hair, plastic, and paper.…”

Section: Introductionmentioning

confidence: 99%

Handwriting Character Recognition Based on Conductor/Insulator‐Identifiable E‐Tattoo Proximity Sensors for Blinds

Liu,

Tong,

Xian

et al. 2023

Adv Funct Materials

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Easy and convenient reading for blinds is of great significance for lowering their learning, entertainment, and communication barrier, and improving their living quality. The general solution is to learn braille, far from satisfying the meet of the blinds’ daily learning and communication. Here, a new‐type conductor/insulator‐identifiable e‐tattoo proximity sensor is developed by simply depositing the circular interdigitated electrodes on organic semiconductor. The discriminable recognition toward conductors and insulators is realized only based on a single e‐tattoo device. The sensors not only enable recognition of the protruding characters like braille based on distance difference, but also enable recognition of the handwriting ink‐brush and pencil graphite characters based on the unique advantage of the sensors in distinguishing conduct and insulator. These results open a new route to realize the material category recognition, provide a user‐friendly way to help the visual impaired effectively reintegrate into society, and broaden the application field of proximity sensors.

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A flexible dual-function capacitive sensor enhanced by loop-patterned fibrous electrode and doped dielectric pillars for spatial perception

Cited by 11 publications

References 34 publications

Flexible wide-range multidimensional force sensors inspired by bones embedded in muscle

Flexible wide-range multidimensional force sensors inspired by bones embedded in muscle

Bioinspired electronic-skin for proximity and pressure detection in robot active sensing

Handwriting Character Recognition Based on Conductor/Insulator‐Identifiable E‐Tattoo Proximity Sensors for Blinds

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