Lightweight, Superelastic, and Hydrophobic Polyimide Nanofiber /MXene Composite Aerogel for Wearable Piezoresistive Sensor and Oil/Water Separation Applications

Advanced Functional Materials, Journal Year: 2021, Volume and Issue: 31(13)

Published: Jan. 18, 2021

Abstract Inspired by the ultralight and structurally robust spider webs, flexible nanofibril‐assembled aerogels with intriguing attributes have been designed for achieving promising performances in various applications. Here, conductive polyimide nanofiber (PINF)/MXene composite aerogel typical “layer‐strut” bracing hierarchical nanofibrous cellular structure has developed via freeze‐drying thermal imidization process. Benefiting from porous architecture bonding between PINF MXene, PINF/MXene exhibits an ultralow density (9.98 mg cm −3 ), temperature tolerance ‐50 to 250 °C, superior compressibility recoverability (up 90% strain), excellent fatigue resistance over 1000 cycles. The can be used as a piezoresistive sensor, outstanding sensing capacity up strain (corresponding 85.21 kPa), detection limit of 0.5% 0.01 cycles, stability reproductivity extremely harsh environments. Furthermore, also oil/water separation properties such high adsorption (55.85 135.29 g −1 ) stable recyclability due its hydrophobicity structure. It is expected that supply new multifunctional platform human bodily motion/physical signals high‐efficient separation.

Language: Английский

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Microengineering Pressure Sensor Active Layers for Improved Performance

Advanced Functional Materials, Journal Year: 2020, Volume and Issue: 30(39)

Published: Aug. 9, 2020

Abstract 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 dictates changes output signal—of capacitive, resistive/piezoresistive, piezoelectric, triboelectric improve sensor performance. Geometric microengineering has been shown performance parameters sensitivity, dynamic range, limit detection, response relaxation times. There are implemented designs, including microdomes, micropyramids, lines or microridges, papillae, microspheres, micropores, microcylinders, each offering different advantages for particular application. It is important compare techniques by which microengineered layers designed fabricated they may provide additional insights on compatibility sensing limits. To evaluate fabrication method, it critical take into account uniformity, ease fabrication, shape size versatility tunability, scalability both device process. By better understanding how design compares, can be targetedly implemented.

Language: Английский

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Conductive MXene/cotton fabric based pressure sensor with both high sensitivity and wide sensing range for human motion detection and E-skin

Chemical Engineering Journal, Journal Year: 2020, Volume and Issue: 420, P. 127720 - 127720

Published: Nov. 16, 2020

Language: Английский

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Highly Compressible, Thermally Stable, Light-Weight, and Robust Aramid Nanofibers/Ti₃AlC₂ MXene Composite Aerogel for Sensitive Pressure Sensor

ACS Nano, Journal Year: 2020, Volume and Issue: 14(8), P. 10633 - 10647

Published: Aug. 10, 2020

Various wearable aerogel sensors are emerging for their light weight, fairly wide sensing range, and sensitive ability. Aramid nanofibers (ANFs) as a kind of burgeoning building blocks realize multifunctional applications in diversified fields innate extinguished mechanical property thermal stability. Limited by high insulating property, this work ANFs were designed to integrate with 2D MXene sheet distinct conductive property. Herein, we report an MXene/ANFs composite through feasible controllable vacuum filtration followed freeze-drying process. Benefiting from the inerratic 3D hierarchical "mortar-brick" porous structure ultralow density 25 mg/cm3, aerogels proved possess compressible resilience appealing performance up 1000 times. Importantly, verified series simulation experiments, sensor shows detection range (2.0-80.0% compression strain), (128 kPa-1), limit (100 Pa), which still play flexible role detecting human movement even vigorous sports after undergoing ultrahigh devastating pressures (∼623 kPa). In addition, can withstand harsh temperature 200 °C excellent flame resistance. The integrated especially highly stability, presents great potential behavior monitoring under certain extreme conditions.

Language: Английский

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Lightweight and Robust Carbon Nanotube/Polyimide Foam for Efficient and Heat-Resistant Electromagnetic Interference Shielding and Microwave Absorption

ACS Applied Materials & Interfaces, Journal Year: 2020, Volume and Issue: 12(7), P. 8704 - 8712

Published: Jan. 23, 2020

Excellent electromagnetic interference (EMI) shielding ability, light weight, and good heat resistance are highly required for practical applications of EMI materials, such as in areas aerospace, aircraft, automobiles. Herein, a lightweight robust carbon nanotube (CNT)/polyimide (PI) foam was developed efficient heat-resistant shielding. Thanks to poly(vinyl pyrrolidone) (PVP) surfactant that not only promotes the uniform dispersion CNTs form perfect CNT conductive networks but also can be removed situ during polymerization process, density resultant CNT/PI is 32.1 mg·cm-3, effectiveness (EMI SE) up 41.1 dB, which represents one highest SE values compared previously reported polymer-based foams. The achieves absorption coefficient (A) 82.3%, very impressive CNT/polymer foams at comparable levels. PI matrix endows with excellent resistance. as-prepared presents higher than 35 dB even after being subjected flame an alcohol burner. Moreover, compressive strength modulus 240.9 323.9 kPa. These results indicate its certain application potential harsh requirement aeronautics aerospace industries material.

Language: Английский

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Flexible conductive Ag nanowire/cellulose nanofibril hybrid nanopaper for strain and temperature sensing applications

Science Bulletin, Journal Year: 2020, Volume and Issue: 65(11), P. 899 - 908

Published: Feb. 25, 2020

Language: Английский

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Ultrasensitive strain sensor based on superhydrophobic microcracked conductive Ti3C2T MXene/paper for human-motion monitoring and E-skin

Science Bulletin, Journal Year: 2021, Volume and Issue: 66(18), P. 1849 - 1857

Published: April 28, 2021

Language: Английский

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Flexible conductive MXene/cellulose nanocrystal coated nonwoven fabrics for tunable wearable strain/pressure sensors

Journal of Materials Chemistry A, Journal Year: 2020, Volume and Issue: 8(40), P. 21131 - 21141

Published: Jan. 1, 2020

Flexible conductive MXene/cellulose nanocrystal coated polyurethane nonwoven fabrics were designed and developed for wearable strain/pressure sensors with tunable sensing performance.

Language: Английский

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Multifunctional wearable strain/pressure sensor based on conductive carbon nanotubes/silk nonwoven fabric with high durability and low detection limit

Advanced Composites and Hybrid Materials, Journal Year: 2022, Volume and Issue: 5(3), P. 1939 - 1950

Published: July 19, 2022

Language: Английский

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Highly Stretchable, Elastic, and Sensitive MXene-Based Hydrogel for Flexible Strain and Pressure Sensors

Research, Journal Year: 2020, Volume and Issue: 2020

Published: Jan. 1, 2020

Electronic skin is driving the next generation of cutting-edge wearable electronic products due to its good wearability and high accuracy information acquisition. However, it remains a challenge fulfill requirements on detecting full-range human activities with existing flexible strain sensors. Herein, highly stretchable, sensitive, multifunctional sensors based MXene- (Ti 3 C 2 T x -) composited poly(vinyl alcohol)/polyvinyl pyrrolidone double-network hydrogels were prepared. The uniformly distributed hydrophilic MXene nanosheets formed three-dimensional conductive network throughout hydrogel, endowing sensor sensitivity. strong interaction between hydrogel matrix greatly improved mechanical properties hydrogels. resulting nanocomposited featured great tensile performance (2400%), toughness, resilience. Particularly, as-prepared pressure revealed ultrahigh sensitivity (10.75 kPa -1 ) wide response range (0-61.5 kPa), fast (33.5 ms), low limit detection (0.87 Pa). Moreover, hydrogel-based sensors, durability, could be employed monitor motions assembled into some aligned devices for subtle detection, providing enormous potential in facial expression phonation recognition, handwriting verification, healthy diagnosis, electronics.

Language: Английский

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