A flexible and highly sensitive capacitive pressure sensor based on conductive fibers with a microporous dielectric for wearable electronics

Chhetry, Ashok; Yoon, Hyosang; Park, Jae Yeong

doi:10.1039/c7tc02926h

Cited by 136 publications

(94 citation statements)

References 43 publications

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“…In addition, the microstructure may reduce the influence from viscoelasticity and hysteresis effects of the polymer and thus increase the response rate. Several other kinds of pressure sensors have also been reported, such as conductive interlaced textiles, conductive fibers,[23a,24] and silk nanofibers . However, the sensing range of these sensors is usually relatively narrow (<30 kPa).…”

Section: Introductionmentioning

confidence: 99%

High‐Performance Pressure Sensors Based on 3D Microstructure Fabricated by a Facile Transfer Technology

Liu

Huang

Zheng

et al. 2019

Adv Materials Technologies

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In this paper, a high‐performance pressure sensor that imitates the sensing functions of human skin is proposed. A rough poly(3,4‐ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) film transferred from abrasive paper acts as the sensing layer, while silver nanowires deposited on the bottom Ecoflex film with a 3D microstructure serve as the electrodes. Because of the bionic hierarchical structure, the resulting sensor exhibits a high pressure sensitivity of 6.13 kPa−1, low limit of detection (20 Pa), low operating voltage (0.1 V), and broad sensing range (up to 90 kPa). Furthermore, as the sensor is ultrathin, ultraflexible, and stretchable, it can easily conform to the uneven surface of human skin to allow monitoring of physical signals from the human body or detect the tactile stimulation of objects. In addition, a sensor array consisting of 4 × 4 pixels is assembled to realize the precise mapping of spatial pressure distribution. By virtue of its superior performance and low‐cost fabrication, the proposed pressure sensor may potentially be applied to next‐generation wearable devices such as e‐skin, soft robotics, and human–machine interaction systems.

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Section: Introductionmentioning

confidence: 99%

High‐Performance Pressure Sensors Based on 3D Microstructure Fabricated by a Facile Transfer Technology

Liu

Huang

Zheng

et al. 2019

Adv Materials Technologies

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“…When a larger ionic liquid droplet with 600 µm diameter is used, a capacitance change from 1 to 250 pF is observed under a pressure of 8 kPa (Figure S4 in the Supporting Information). In this case, the sensitivity is calculated to be 31.1 kPa −1 , which is one of the highest values reported in the medium‐pressure range (> a few kPa) so far (see Table S1 in the Supporting Information) . Although higher sensitivities have been reported in the previous reports, these values are typically obtained in extremely low pressure regimes (below 1 kPa) .…”

Section: Resultsmentioning

confidence: 54%

“…In this case, the sensitivity is calculated to be 31.1 kPa −1 , which is one of the highest values reported in the medium-pressure range (> a few kPa) so far (see Table S1 in the Supporting Information). [9,[28][29][30][31][32] Although higher sensitivities have been reported in the previous reports, these values are typically obtained in extremely low pressure regimes (below 1 kPa). [33,34] For instance, the use of pyramidal ionic gels exhibited extremely high sensitivity of 41 kPa −1 at the low pressure below 0.4 kPa.…”

Section: Figure 1amentioning

confidence: 99%

Enhanced Sensitivity of Iontronic Graphene Tactile Sensors Facilitated by Spreading of Ionic Liquid Pinned on Graphene Grid

Kim

Lee

Hwang

et al. 2020

Adv Funct Materials

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Iontronic graphene tactile sensors (i‐GTS) composed of a top floating graphene electrode and an ionic liquid droplet pinned on a bottom graphene grid, which can dramatically enhance the performance of capacitive‐type tactile sensors, are presented. When mechanical stress is applied to the top floating electrode, the i‐GTS operates in one of the following three regimes: air–air, air–electric double layer (EDL) transition, or EDL–EDL. Once the top electrode contacts the ionic liquid in the i‐GTS, the spreading behavior of the ionic liquid causes a capacitance transition (from a few pF to over hundreds of pF). This is because EDLs are formed at the interfaces between the electrodes and the ionic liquid. In this case, the pressure sensitivity increases to ≈31.1 kPa−1 with a gentle touch. Under prolonged application of pressure, the capacitance increases gradually, mainly due to the contact line expansion of the ionic liquid bridge pinned on the graphene grid. The sensors exhibit outstanding properties (response and relaxation times below 80 ms, and stability over 300 cycles) while demonstrating ultimate signal‐to‐noise ratios in the array tests. The contact‐induced spreading behavior of the ionic liquid is the key for boosting the sensor performance.

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“…Textile based electronic technologies enable unique approaches for designing flexible, conformable, light weight sensors capable of detecting external stimuli including pressure, [1][2][3][4][5][6] two conducting yarns (silver and SS) on pressure, humidity, and wetness sensing. A summary of the dielectric/electrode combinations studied is shown in Table 1.…”

Section: Introductionmentioning

confidence: 99%

Fully‐Textile Seam‐Line Sensors for Facile Textile Integration and Tunable Multi‐Modal Sensing of Pressure, Humidity, and Wetness

Agcayazi

Tabor

McKnight

et al. 2020

Adv Materials Technologies

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The unique potential of e‐textiles for unobtrusive and ubiquitous monitoring and their innovative interfacing with electronic devices has garnished great attention. Sensors are one of the few essential devices or components necessary for most functional e‐textile applications. Ideally, any e‐textile based sensor should be soft, easily integrated in textile manufacturing processes, and tunable for the desired applications. Here, an easy‐to‐manufacture, tunable, fully‐textile sensor system with capability of detecting pressure, humidity, or wetness is presented. Capacitive pressure sensors are formed via a traditional sewing process with two commercially available conductive sewing yarns (silver‐plated polyamide (silver) and stainless steel (SS)) with cotton knit, polyethylene‐terephthalate (PET) knit and elastomeric meltblown textile dielectrics. The relationship between the sensor's physical, mechanical, and electromechanical properties including hysteresis, sensitivity, response, and relaxation time is evaluated. In addition, the same sensor configuration is assessed for its humidity and wetness sensing performance. Results indicate that pressure, relative humidity (RH), and wetness sensing performance are easily tunable using different combinations of the conductive and dielectric textile materials. Finally, proof of concept deployment demonstrations as human‐machine interfaces within a pressure sensing mat and a smart glove capable of remotely controlling a drone are provided.

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A flexible and highly sensitive capacitive pressure sensor based on conductive fibers with a microporous dielectric for wearable electronics

Abstract: In this study, a flexible and highly sensitive capacitive pressure sensor has been fabricated by coating a microporous polydimethylsiloxane (PDMS) elastomeric dielectric onto conductive fibers.

Cited by 136 publications

References 43 publications

High‐Performance Pressure Sensors Based on 3D Microstructure Fabricated by a Facile Transfer Technology

High‐Performance Pressure Sensors Based on 3D Microstructure Fabricated by a Facile Transfer Technology

Enhanced Sensitivity of Iontronic Graphene Tactile Sensors Facilitated by Spreading of Ionic Liquid Pinned on Graphene Grid

Fully‐Textile Seam‐Line Sensors for Facile Textile Integration and Tunable Multi‐Modal Sensing of Pressure, Humidity, and Wetness

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