Flexible Transparent Iontronic Film for Interfacial Capacitive Pressure Sensing

Nie, Baoqing; Li, Ruya; Cao, J.; Brandt, James D.; Pan, Tingrui

doi:10.1002/adma.201502556

Cited by 376 publications

(366 citation statements)

References 47 publications

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“…Nie et al [61] fabricated a capacitive pressure sensor utilizing an ionic gel matrix. This transparent film sensor had a high sensitivity (3.1 nF/kPa) because the electrical double layer produced an ultra-high unitarea capacitance.…”

Section: Ionic Skinmentioning

confidence: 99%

“…Ionic conductors have attracted attention in capacitive tactile sensing applications, due to their high transparency and conductivity under large deformation [61][62][63]. Nie et al [61] fabricated a capacitive pressure sensor utilizing an ionic gel matrix.…”

Section: Ionic Skinmentioning

confidence: 99%

“…Ionic conductors have been studied for use in applications that demand greater stretch and greater transparency than electronic conductors, such as polyacrylamide hydrogels [56][57][58] and ionogels composed of ionic liquid and polyacrylic acid [59]. Recent work has demonstrated that these materials can be used as the electrodes of transparent sensors and actuators for artificial muscles, skin, axons and kinesthetic sensing [60][61][62][63][64]. A transparent, capacitive sensor termed ionic skin was first developed using a dielectric elastomer covered with ionic electrodes, which were composed of a polyacrylamide hydrogel with NaCl [9].…”

Section: Ionic Conductorsmentioning

confidence: 99%

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Dielectric Elastomer Sensors

Ni¹,

Zhang²

2017

Elastomers

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Dielectric elastomers (DEs) represent a class of electroactive polymers (EAPs) that exhibit a significant electromechanical effect, which has made them very attractive over the last several decades for use as soft actuators, sensors and generators. Based on the principle of a plane-parallel capacitor, dielectric elastomer sensors consist of a flexible and stretchable dielectric polymer sandwiched between two compliant electrodes. With the development of elastic polymers and stretchable conductors, flexible and sensitive dielectric elastomer tactile sensors, similar to human skin, have been used for measuring mechanical deformations, such as pressure, strain, shear and torsion. For high sensitivity and fast response, air gaps and microstructural dielectric layers are employed in pressure sensors or multiaxial force sensors. Multimodal dielectric elastomer sensors have been reported that can detect mechanical deformation but can also sense temperature, humidity, as well as chemical and biological stimulation in human-activity monitoring and personal healthcare. Hence, dielectric elastomer sensors have great potential for applications in soft robotics, wearable devices, medical diagnostic and structural health monitoring, because of their large deformation, low cost, ease of fabrication and ease of integration into monitored structures.

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Section: Ionic Skinmentioning

confidence: 99%

Section: Ionic Skinmentioning

confidence: 99%

Section: Ionic Conductorsmentioning

confidence: 99%

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Dielectric Elastomer Sensors

Ni¹,

Zhang²

2017

Elastomers

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“…Numerous sensors have been demonstrated. The three major mechanical-to-electrical conversion principles are the capacitance [3][4][5][6][7][8] , piezo-electricity 9,10 , and piezoresistivity [11][12][13][14][15][16][17] . Piezo-based sensors rely upon either electrical voltage or resistance changes under mechanical deformation.…”

Section: Introductionmentioning

confidence: 99%

Block copolymer structural color strain sensor

et al. 2018

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The development of electrically responsive sensors based on the capacitance, voltage, and resistance that can detect and simultaneou sly visualize the large strain involved with human motion is in great demand. Here, we demonstrate a highly stretchable, large strain capacitive sensor that can visualize strain based on the strain-responsive structural color (SC). Our device contains an elastomeric sensing film that produces a capacitance change under strain, in which a selfassembled block copolymer (BCP) photonic crystal (PC) film with 1D periodic in-plane lamellae aligned parallel to the film surface is embedded for the efficient visualization of strain. The capacitance change arises from changes in the dimensions of the elastomer film under strain. The mechanochromic BCP PC film responds to strain, giving rise to an SC change with strain. The initial red SC of the sensor blueshifts and turns blue when the sensor is stretched to 100%, resulting in a full-color SC alteration as a function of the strain. Our BCP SC strain sensor exhibits a fast strain response with multi-cycle reliability of both the capacitance and SC changes over 1000 cycles. This property allows for efficient visible recognition not only of the strained positions during finger bending and poking with a sharp object but also of the shapes of the strained objects.

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“…With increasing awareness and demands regarding personalized health care, wearable sensors have been extensively investigated in recent years, for which electrical conductance, mechanical flexibility, chemical stability, optical transparency, and biocompatibility are all required [52][53][54][55][56] . The conductive PEDOT:PSS film has proven to be a candidate material for such wearable applications 57,58 .…”

Section: Demonstrationsmentioning

confidence: 99%

Photopatternable PEDOT:PSS/PEG hybrid thin film with moisture stability and sensitivity

Zhu

Yang

et al. 2017

Microsyst Nanoeng

Self Cite

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Degradation and delamination resulting from environmental humidity have been technically challenging for poly (3,4-ethylenedioxythiophene): poly(styrene sulfonate) (PEDOT:PSS) thin-film processing. To overcome this problem, we introduced a one-step photolithographic method to both pattern and link a PEDOT:PSS film onto a poly (ethylene glycol) (PEG) layer as a hybrid thin film structure on a flexible substrate. This film exhibited excellent long-term moisture stability (more than 10 days) and lithographic resolution (as low as 2 μm). Mechanical characterizations were performed, including both stretching and bending tests, which illustrated the strong adhesion present between the PEDOT:PSS and PEG layers as well as between the hybrid thin film and substrate. Moreover, the hybrid moisture-absorbable film showed a quick response of its permittivity to environmental humidity variations, in which the patterned PEDOT:PSS layer served as an electrode and the PEG layer as a moisture-sensing element. Perspiration tracking over various parts of the body surface as well as breath rate measurement under the nose were successfully carried out as demonstrations, which illustrated the potential utility of this stable hybrid thin film for emerging flexible and wearable electronic applications.

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Flexible Transparent Iontronic Film for Interfacial Capacitive Pressure Sensing

Cited by 376 publications

References 47 publications

Dielectric Elastomer Sensors

Dielectric Elastomer Sensors

Block copolymer structural color strain sensor

Photopatternable PEDOT:PSS/PEG hybrid thin film with moisture stability and sensitivity

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