3D Porous Structure in MXene/PANI Foam for a High‐Performance Flexible Pressure Sensor

Cheng, Yongfa; Hou, Yixin; Sun, Li; Ma, Yanan; Su, Jun; Zhang, Zhi; Liu, Nishuang; Li, Luying; Gao, Yihua

doi:10.1002/smll.202204806

Cited by 70 publications

(39 citation statements)

References 46 publications

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“…The TPMS structural designed TMM pressure sensors showed superior pressure sensing performance with both high sensitivity and ultra-wide sensing range. [6,16,[38][39][40][41][42][43][44][45][46][47][48][49][50][51] FEA was performed on TPMS pressure sensors with different porosity to investigate the piezoresistive response mechanisms. Specifically, two sets of compressive stress, 0.5 and 5 MPa, were chosen for FEA analysis.…”

Section: Mechanical Property and Finite Element Simulation Of Pressur...mentioning

confidence: 99%

Ultra‐Wide Range, High Sensitivity Piezoresistive Sensor Based on Triple Periodic Minimum Surface Construction

Feng

et al. 2023

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Flexible piezoresistive sensors with biological structures are widely exploited for high sensitivity and detection. However, the conventional bionic structure pressure sensors usually suffer from irreconcilable conflicts between high sensitivity and wide detection response range. Herein, a triple periodic minimum surface (TPMS) structure sensor is proposed based on parametric structural design and 3D printing techniques. Upon tailoring of the dedicated structural parameters, the resulting sensors exhibit superior compression durability, high sensitivity, and ultra–high detection range, that enabling it meets the needs of various scenes. As a model system, TPMS structure sensor with 40.5% porosity exhibits an ultra–high sensitivity (132 kPa−1 in 0–5.7 MPa), wide detection strain range (0–31.2%), high repeatability and durability (1000 cycles in 4.41 MPa, 10000 s in 1.32 MPa), and low detection limit (1% in 80 kPa). The stress/strain distributions have been identified using finite element analysis. Toward practical applications, the TPMS structural sensors can be applied to detect human activity and health monitoring (i.e., voice recognition, finger pressure, sitting, standing, walking, and falling down behaviors). The synergistic effects of MWCNTs and MXene conductive network also ensure the composite further being utilized for electromagnetic interference shielding applications.

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Section: Mechanical Property and Finite Element Simulation Of Pressur...mentioning

confidence: 99%

Ultra‐Wide Range, High Sensitivity Piezoresistive Sensor Based on Triple Periodic Minimum Surface Construction

Feng

et al. 2023

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“…Among the available reports, several categories of conduction mechanisms of piezoresistive, − capacitive, − piezoelectric, − and triboelectric − effects are the most common. The piezoresistive sensor, which converts external mechanical stimulus into resistance signal, has great superiority in practical applications for its simple structure and low-power consumption in particular.…”

Section: Introductionmentioning

confidence: 99%

Efficient Fabrication of TPU/MXene/Tungsten Disulfide Fibers with Ultra-Fast Response for Human Respiratory Pattern Recognition and Disease Diagnosis via Deep Learning

Wang,

Zhang,

Wang

et al. 2023

ACS Appl. Mater. Interfaces

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Flexible wearable pressure sensors have received increasing attention as the potential application of flexible wearable devices in human health monitoring and artificial intelligence. However, the complex and expensive process of the conductive filler has limited its practical production and application on a large scale to a certain extent. This study presents a kind of piezoresistive sensor by sinking nonwoven fabrics (NWFs) into tungsten disulfide (WS2) and Ti3C2T x MXene solutions. With the advantages of a simple production process and practicality, it is conducive to the realization of large-scale production. The assembled flexible pressure sensor exhibits high sensitivity (45.81 kPa–1), wide detection range (0–410 kPa), fast response/recovery time (18/36 ms), and excellent stability and long-term durability (up to 5000 test cycles). Because of the high elastic modulus of MXene and the synergistic effect between WS2 and MXene, the detection range and sensitivity of the piezoresistive pressure sensor are greatly improved, realizing the stable detection of human motion status in all directions. Meanwhile, its high sensitivity at low pressure allows the sensor to accurately detect weak signals such as weak airflow and wrist pulses. In addition, combining the sensor with deep-learning makes it easy to recognize human respiratory patterns with high accuracy, demonstrating its potential impact in the fields of ergonomics and low-cost flexible electronics.

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“…To satisfy the demands of these applications, flexible pressure sensors should not only possess high sensitivity, wide detection range, fast response time, excellent repeatability, and robust reliability but also offer the advantages of low cost, high scalability, and easy fabrication. Flexible pressure sensors are generally categorized into four types based on their sensing mechanism and signal transmission mode: piezoresistive, − piezoelectric, − capacitive, , and triboelectric. , In the case of piezoresistive flexible sensors, applying external forces to their sensing material and device structure induces local strain in the force-bearing area. Consequently, the resistance network, consisting of material resistance and contact resistance within the sensor, changes with the localized strain, enabling the detection and identification of pressure. , …”

Section: Introductionmentioning

confidence: 99%

Rapid Fabrication of High-Performance Flexible Pressure Sensors Using Laser Pyrolysis Direct Writing

Wang,

Zong,

Yang

et al. 2023

ACS Appl. Mater. Interfaces

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The fabrication of flexible pressure sensors with low cost, high scalability, and easy fabrication is an essential driving force in developing flexible electronics, especially for high-performance sensors that require precise surface microstructures. However, optimizing complex fabrication processes and expensive microfabrication methods remains a significant challenge. In this study, we introduce a laser pyrolysis direct writing technology that enables rapid and efficient fabrication of high-performance flexible pressure sensors with a microtruncated pyramid array. The pressure sensor demonstrates exceptional sensitivities, with the values of 3132.0, 322.5, and 27.8 kPa −1 in the pressure ranges of 0−0.5, 0.5−3.5, and 3.5−10 kPa, respectively. Furthermore, the sensor exhibits rapid response times (loading: 22 ms, unloading: 18 ms) and exceptional reliability, enduring over 3000 pressure loading and unloading cycles. Moreover, the pressure sensor can be easily integrated into a sensor array for spatial pressure distribution detection. The laser pyrolysis direct writing technology introduced in this study presents a highly efficient and promising approach to designing and fabricating high-performance flexible pressure sensors utilizing micro-structured polymer substrates.

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3D Porous Structure in MXene/PANI Foam for a High‐Performance Flexible Pressure Sensor

Cited by 70 publications

References 46 publications

Ultra‐Wide Range, High Sensitivity Piezoresistive Sensor Based on Triple Periodic Minimum Surface Construction

Ultra‐Wide Range, High Sensitivity Piezoresistive Sensor Based on Triple Periodic Minimum Surface Construction

Efficient Fabrication of TPU/MXene/Tungsten Disulfide Fibers with Ultra-Fast Response for Human Respiratory Pattern Recognition and Disease Diagnosis via Deep Learning

Rapid Fabrication of High-Performance Flexible Pressure Sensors Using Laser Pyrolysis Direct Writing

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