A laser ablated graphene-based flexible self-powered pressure sensor for human gestures and finger pulse monitoring

Das, Partha Sarati; Chhetry, Ashok; Maharjan, Pukar; Rasel, M. Salauddin; Park, Jae Yeong

doi:10.1007/s12274-019-2433-5

Cited by 90 publications

(54 citation statements)

References 62 publications

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“…Two recent works have highlighted the use of microengineering for triboelectric pressure sensors. [ 61,62 ] Each uses a different method of micropatterning that has been previously discussed: photolithography [ 61 ] and molding using commercially available materials. [ 62 ] Lin et al developed a triboelectric pressure sensor that can detect both static and dynamic pressures using pyramid microstructures placed on a gold electrode substrate.…”

Section: Triboelectric Pressure Sensorsmentioning

confidence: 99%

“…[ 61,62 ] Each uses a different method of micropatterning that has been previously discussed: photolithography [ 61 ] and molding using commercially available materials. [ 62 ] Lin et al developed a triboelectric pressure sensor that can detect both static and dynamic pressures using pyramid microstructures placed on a gold electrode substrate. [ 61 ] The microstructures interact with a composite of silver nanowires and nanoparticles to induce the triboelectric effect upon compression.…”

Section: Triboelectric Pressure Sensorsmentioning

confidence: 99%

“…Alternatively, Das et al developed a low cost, eco‐friendly triboelectric pressure sensors using micropatterned PDMS molded with commercially available sandpaper to achieve even higher sensitivity. [ 62 ] PDMS solution was spincoated on the sandpaper, allowed to cure, and finally demolded with the micropattern. [ 62 ] With these micropatterned triboelectric pressure sensors, the charging occurs due to iterative physical contact between the micropatterned PDMS and a flat surface with a different polarity.…”

Section: Triboelectric Pressure Sensorsmentioning

confidence: 99%

“…The most common of these sensors utilize capacitive, resistive, piezoelectric, and triboelectric means to transduce said deformation into a measurable signal. [ 7,8,14,15,17,28,30,31,34,36,38,43,49–64 ] In all cases, the geometry of the active layer can have significant effects on a sensor's key performance parameters. A common approach to improve sensor performance involves changing the material used or engineering microstructures into the active layer with geometric features ≈1–1000 µm in size.…”

Section: Introductionmentioning

confidence: 99%

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Microengineering Pressure Sensor Active Layers for Improved Performance

Ruth

Feig

Tran

et al. 2020

Adv Funct Materials

379

277

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Pressure sensors play an integral role in a wide range of applications, such as soft robotics and health monitoring. In order to meet this demand, many groups microengineer the active layer-the layer that deforms under pressure and dictates changes in the output signal-of capacitive, resistive/piezoresistive, piezoelectric, and triboelectric pressure sensors in order to improve sensor performance. Geometric microengineering of the active layer has been shown to improve performance parameters such as sensitivity, dynamic range, limit of detection, and response and relaxation times. There are a wide range of implemented designs, including microdomes, micropyramids, lines or microridges, papillae, microspheres, micropores, and microcylinders, each offering different advantages for a particular application. It is important to compare the techniques by which the microengineered active layers are designed and fabricated as they may provide additional insights on compatibility and sensing range limits. To evaluate each fabrication method, it is critical to take into account the active layer uniformity, ease of fabrication, shape and size versatility and tunability, and scalability of both the device and the fabrication process. By better understanding how microengineering techniques and design compares, pressure sensors can be targetedly designed and implemented.

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Section: Triboelectric Pressure Sensorsmentioning

confidence: 99%

Section: Triboelectric Pressure Sensorsmentioning

confidence: 99%

Section: Triboelectric Pressure Sensorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Microengineering Pressure Sensor Active Layers for Improved Performance

Ruth

Feig

Tran

et al. 2020

Adv Funct Materials

379

277

View full text Add to dashboard Cite

show abstract

“…Recently, researchers have applied intensive efforts to develop flexible artificial electronic skin (e‐skin) with human‐like sensory capabilities such as temperature, [ 1 ] pressure, [ 2 ] displacement, [ 3 ] pulse, [ 4 ] electrocardiograph [ 5 ] or tactile sensing, [ 6 ] etc. Even though these studies on sensory functions of e‐skin have achieved significant progress, [ 7 ] continuous, ubiquitous, and green energy supply for wearable electronics [ 8 ] still remains technique challenge.…”

Section: Introductionmentioning

confidence: 99%

Self‐Powered Electronic Skin with Multisensory Functions Based on Thermoelectric Conversion

Yuan

Zhu

2020

Adv Materials Technologies

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Wearable electronics for personal healthcare and environment awareness are attracting more and more attention, where continuous energy supply is requisite and still faces great challenge. Here, a self‐powered electronic skin (e‐skin) system with multiple sensations as well as data processing and data visualization is developed. The core component is a hand‐shaped flexible thermoelectric generator functionalized as e‐skin, which not only harvests energy from body heat to supply power for the entire e‐skin system, but also plays a role of multisensory receptor. The e‐skin system is endowed with multifunction of sensing temperature and humidity, perceiving wind and motion, identifying material and monitoring acceleration, as well as displaying the sensing data on a liquid crystal display, all of which are powered by human body heat. The self‐powered flexible e‐skin provides an advantageous approach for applications in repair of skin injury, wearable healthcare devices, and wearable robots.

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Enhanced Sensitivity of Capacitive Pressure and Strain Sensor Based on CaCu₃Ti₄O₁₂ Wrapped Hybrid Sponge for Wearable Applications

Chhetry

Sharma

Yoon

et al. 2020

Adv Funct Materials

178

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Pressure sensors with highly sensitive and flexible characteristics have extensive applications in wearable electronics, soft robotics, human–machine interface, and more. Herein, an effective strategy is explored to enhance the sensitivity of the capacitive pressure sensor by fabricating a dielectric hybrid sponge consisting of calcium copper titanate (CaCu3Ti4O12, CCTO), a giant dielectric permittivity material, in polyurethane (PU). An ultrasoft CCTO@PU hybrid sponge is fabricated via dip‐coating the PU sponge into surface‐modified CCTO nanoparticles using 3‐aminopropyl triethoxysilane. The overall results show that the –NH2 functionalized CCTO attributes proper adhesion of CCTO with the –OCN group of the PU to enhance interfacial polarization leading to a high dielectric permittivity (167.05) and low loss tangent (0.71) beneficial for flexible pressure sensing applications. Moreover, the as‐prepared CCTO@PU hybrid sponge at 30 wt% CCTO concentration exhibits excellent electromechanical properties with an ultralow compression modulus of 27.83 kPa and a high sensitivity of 0.73 kPa−1 in a low‐pressure regime (<1.6 kPa). Finally, pressure and strain sensing performance is demonstrated for the detection of human activities by mounting the sensor on various parts of the human body. The work reveals a new opportunity for the facile fabrication of high performance CCTO‐based capacitive sensors with multifunctional properties.

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A laser ablated graphene-based flexible self-powered pressure sensor for human gestures and finger pulse monitoring

Cited by 90 publications

References 62 publications

Microengineering Pressure Sensor Active Layers for Improved Performance

Microengineering Pressure Sensor Active Layers for Improved Performance

Self‐Powered Electronic Skin with Multisensory Functions Based on Thermoelectric Conversion

Enhanced Sensitivity of Capacitive Pressure and Strain Sensor Based on CaCu₃Ti₄O₁₂ Wrapped Hybrid Sponge for Wearable Applications

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A laser ablated graphene-based flexible self-powered pressure sensor for human gestures and finger pulse monitoring

Cited by 90 publications

References 62 publications

Microengineering Pressure Sensor Active Layers for Improved Performance

Microengineering Pressure Sensor Active Layers for Improved Performance

Self‐Powered Electronic Skin with Multisensory Functions Based on Thermoelectric Conversion

Enhanced Sensitivity of Capacitive Pressure and Strain Sensor Based on CaCu3Ti4O12 Wrapped Hybrid Sponge for Wearable Applications

Contact Info

Product

Resources

About

Enhanced Sensitivity of Capacitive Pressure and Strain Sensor Based on CaCu₃Ti₄O₁₂ Wrapped Hybrid Sponge for Wearable Applications