A high-performance wearable pressure sensor based on an MXene/PVP composite nanofiber membrane for health monitoring

Ren, Mengna; Sun, Zhongsen; Zhang, Mengqi; Yang, Xiaojun; Guo, Dadong; Dong, Shengde; Dhakal, Rajendra; Yao, Zhao; Li, Yuanyue; Kim, Nam‐Young

doi:10.1039/d2na00339b

Cited by 26 publications

(24 citation statements)

References 56 publications

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“…The X-ray diffraction (XRD) spectrum was further obtained to demonstrate the successful preparation of MXene, with XRD patterns of the MXene powder and the CNT/MXene/PDMS mixture outlined in Figure a. The (002) peak of MXene powder appeared at 2θ = 6.9°, verifying that the aluminum layer has been successfully etched. − Moreover, when MXene was mixed with CNTs and PDMS, the (002) peak shifted from 6.9° to 6.4°, suggesting that the lattice pitch increases through the synergy between the one-dimensional CNTs and two-dimensional MXene. Figure b–d displays the XPS results for MXene.…”

Section: Resultsmentioning

confidence: 99%

Capacitive Pressure Sensor Combining Dual Dielectric Layers with Integrated Composite Electrode for Wearable Healthcare Monitoring

Li,

Liu,

Ding

et al. 2024

ACS Appl. Mater. Interfaces

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Foot activity can reflect numerous physiological abnormalities in the human body, making gait a valuable metric in health monitoring. Research on flexible sensors for gait monitoring has focused on high sensitivity, wide working range, fast response, and low detection limit, but challenges remain in areas such as elasticity, antibacterial activity, user-friendliness, and long-term stability. In this study, we have developed a novel capacitive pressure sensor that offers an ultralow detection limit of 1 Pa, wide detection ranges from 1 Pa to 2 MPa, a high sensitivity of 0.091 kPa–1, a fast response time of 71 ms, and exceptional stability over 6000 cycles. This sensor not only has the ability of accurately discriminating mechanical stimuli but also meets the requirements of elasticity, antibacterial activity, wearable comfort, and long-term stability for gait monitoring. The fabrication method of a dual dielectric layer and integrated composite electrode is simple, cost-effective, stable, and amenable to mass production. Thereinto, the introduction of a dual dielectric layer, based on an optimized electrospinning network and micropillar array, has significantly improved the sensitivity, detection range, elasticity, and antibacterial performance of the sensor. The integrated flexible electrodes are made by template method using composite materials of carbon nanotubes (CNTs), two-dimensional titanium carbide Ti3C2T x (MXene), and polydimethylsiloxane (PDMS), offering synergistic advantages in terms of conductivity, stability, sensitivity, and practicality. Additionally, we designed a smart insole that integrates the as-prepared sensors with a miniature instrument as a wearable platform for gait monitoring and disease warning. The developed sensor and wearable platform offer a cutting-edge solution for monitoring human activity and detecting diseases in a noninvasive manner, paving the way for future wearable devices and personalized healthcare technologies.

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Section: Resultsmentioning

confidence: 99%

Capacitive Pressure Sensor Combining Dual Dielectric Layers with Integrated Composite Electrode for Wearable Healthcare Monitoring

Li,

Liu,

Ding

et al. 2024

ACS Appl. Mater. Interfaces

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“…The experimental results show that the fabricated flexible capacitive sensor displays a high sensitivity (7.24 kPa −1 ) in the ultralow pressure detection range (9.0 × 10 −3 to 0.98 kPa) due to the synergistic effect of TPU nanofibrous membrane and AgNWs. Similarly, Ren et al 53 prepared a nanofibrous membrane via electrospinning a PVP precursor solution with different mass fractions of MXenes for flexible capacitive sensors. The performance tests suggest that the flexible capacitive sensor including the dielectric layer made with a PVP nanofibrous membrane contains 0.1 wt % MXenes, addressing optimal mechanical and electrical properties because of the high porosity and flexibility of the electrospun nanofibers.…”

Section: Flexible Capacitive Sensorsmentioning

confidence: 99%

Electrospun Micro/Nanofiber-Based Biomechanical Sensors

Li,

Zhang,

et al. 2023

ACS Appl. Polym. Mater.

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Electrospun micro/nanofibers have gained popularity recently for flexible biomechanical sensors because of their advantages of lightness, compatibility, breathability, mechanical deformability, and function integrability, etc., offering them unprecedented sensitivities and versatilities. With increasing advances in the digital era, existing electrospun flexible sensors are not capable of catering to the demands of multiscenario applications including wearable electronics, interactive interfaces, and real-time continuous health monitoring. To ease and expedite their developments, we thoroughly reviewed their latest progress regarding design, preparation, and optimization. First, a brief overview of the design approaches of electrospun flexible biomechanical sensors based on the working mechanism is highlighted. Then, two kinds of preparation strategies including direct electrospinning and post-treatment-assisted electrospinning are discussed in detail. Further, four means for optimizing the performance and endowing multifunctions to electrospun flexible biomechanical sensors are demonstrated in terms of processing. Accordingly, the challenges and the potential solutions related to this topic are addressed, providing a future direction for the next generation of electrospun flexible biomechanical sensors.

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“…This leads to a decrease in sensitivity. 22,23 It is well known that the circulation and adsorption of water molecules in 3D pore structures provide pore channels. 24,25 This provides an idea to solve the problem of sensitivity reduction caused by competition between conductive fillers.…”

Section: Introductionmentioning

confidence: 99%

A super water-resistant MXene sponge flexible sensor for bifunctional sensing of physical and chemical stimuli

Qiang

Zhao

et al. 2023

Lab Chip

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A high-performance wearable pressure sensor based on an MXene/PVP composite nanofiber membrane for health monitoring

Abstract: Flexible and wearable pressure sensors have attracted extensive attention in domains, such as electronic skin, medical monitoring and human machine interaction. However, developing a pressure sensor with high sensitivity, mechanical...

Cited by 26 publications

References 56 publications

Capacitive Pressure Sensor Combining Dual Dielectric Layers with Integrated Composite Electrode for Wearable Healthcare Monitoring

Capacitive Pressure Sensor Combining Dual Dielectric Layers with Integrated Composite Electrode for Wearable Healthcare Monitoring

Electrospun Micro/Nanofiber-Based Biomechanical Sensors

A super water-resistant MXene sponge flexible sensor for bifunctional sensing of physical and chemical stimuli

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