Tracheid-inspired nanoarchitectured carbon-based aerogels with ultra-compressibility for wearable piezoresistive sensors

Wei, Lansheng; Wu, Zhengguo; Tang, Shuwei; Qin, Xiaoqian; Xiong, Yutong; Li, Jiaming; Ruiz‐Hitzky, Eduardo; Wang, Xiaoying

doi:10.1016/j.carbon.2022.11.081

Cited by 25 publications

(10 citation statements)

References 49 publications

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“…170 Other uses of MXene bionanoarchitectures deal with a broad field related to health, from theranostics 261 to piezoelectric sensors for the real-time monitoring of certain human activities. 148…”

Section: Biohybrid Nanoarchitectonics Based On Clays and Mxenesmentioning

confidence: 99%

MXenes vs. clays: emerging and traditional 2D layered nanoarchitectonics

Ruiz-Hitzky,

Ruiz-Garcia

2023

Nanoscale

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Section: Biohybrid Nanoarchitectonics Based On Clays and Mxenesmentioning

confidence: 99%

MXenes vs. clays: emerging and traditional 2D layered nanoarchitectonics

Ruiz-Hitzky,

Ruiz-Garcia

2023

Nanoscale

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“…These aerogels exhibit notable advantages in terms of their electrical conductivity, usefulness, and stability . Carbon aerogels have been widely utilized in various applications owing to their potential to demonstrate a controlled three-dimensional hierarchical structure, low density, remarkable adsorption capability, and elevated porosity. , Furthermore, because of its capacity to transform external strain into identifiable electrical signals, it has proven to be one of the crucial components for the creation of high-performance wearable sensors. − Hence, the investigation of carbon aerogels, characterized by a straightforward synthesis method, adjustable microstructure, and exceptional performance, has emerged as a prominent area of research.…”

Section: Introductionmentioning

confidence: 99%

Carbon Nanofibrous Aerogels Derived from Electrospun Polyimide for Multifunctional Piezoresistive Sensors

Lin,

Li,

Song

et al. 2024

ACS Appl. Mater. Interfaces

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The fabrication of carbon aerogels with ultralow density, high electrical conductivity, and ultraelasticity still remains substantial challenges. This study utilizes electrospun polyimide aerogel as the source to fabricate flexible carbon nanofibrous aerogel (PI-CNA) capable of multifunctional applications. The lightweight PI-CNA based piezoresistive sensor shows a wide linear range (0−217 kPa), rapid response/recovery time, and fatigue resistance (12,000 cycles). More importantly, the superior pressure sensing enables the PI-CNA for allrange healthcare sensing, including pulse monitoring, physiological activity detection, speech recognition, and gait recognition. Moreover, the EMI SE and the A coefficient of the PI-CNA reach 45 dB and 0.62, respectively, indicating the outstanding absorption dominated EMI shielding effects due to the multiple reflections and absorption. Furthermore, PI-CNA exhibits satisfying Joule heating performance up to 120 °C with rapid response time (10−30 s) under low supply voltages (1.5−5 V) and possesses sufficient heating reliability and repeatability in long-term repeated heating/cooling cycles. The fabricated PI-CNA shows significant potential applications in wearable technologies, energy conversion, electronic skin, and artificial intelligence.

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“…Currently, the sensitivity and preparation method of these sensors have become important factors in determining whether flexible piezoresistive sensors with a porous structure can be widely used in the field of speech recognition. − Speech signals are relatively weak, as they originate from the movement of the laryngeal muscles and the vibration of the vocal cords, which places high requirements on the sensitivity of the piezoresistive sensors. Therefore, the design and preparation of substrates with novel porous structures and the synthesis of novel porous materials have been extensively studied to improve the sensitivity of piezoresistive sensors. − However, in the pursuit to improve sensor sensitivity, the preparation methods of piezoresistive sensors with a porous structure have also become very complicated, which is not conducive to the large-scale application of these sensors. − Therefore, it is of great significance to develop porous structure-based flexible piezoresistive sensors that are highly sensitive and can be prepared by using simple methods. However, the most commonly used methods for preparing flexible piezoresistive sensors with a porous structure cannot easily meet the above requirements.…”

Section: Introductionmentioning

confidence: 99%

Bubbles-Induced Porous Structure-Based Flexible Piezoresistive Sensors for Speech Recognition

Gao,

Yuan,

Xue

et al. 2024

ACS Appl. Mater. Interfaces

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Flexible piezoresistive sensors with a porous structure that are used in the field of speech recognition are seldom characterized by both high sensitivity and ease of preparation. In this study, a piezoresistive sensor with a porous structure that is both highly sensitive and can be prepared by using a simple method is proposed for speech recognition. The preparation process utilizes the interaction of bubbles generated by ethanol evaporation and active agents with polydimethylsiloxane to produce a porous flexible substrate. This preparation process requires neither templates nor harsh experimental conditions such as a low temperature and a low pressure. Furthermore, the prepared piezoresistive sensor has excellent properties, such as a high sensitivity (27.6 kPa −1 ), a satisfactory response time (800 μs), and a good stability (10,000 cycles). When used for speech recognition, more than 1500 vocalizations and silent speech signals obtained from subjects saying numbers from "0" to "9" were collected by the sensor for training a convolutional neural network model. The average accuracy of the recognition reached 94.8%. The simple preparation process and the excellent performance of the prepared flexible piezoresistive sensor endow it with a wide application prospect in the field of speech recognition.

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Tracheid-inspired nanoarchitectured carbon-based aerogels with ultra-compressibility for wearable piezoresistive sensors

Cited by 25 publications

References 49 publications

MXenes vs. clays: emerging and traditional 2D layered nanoarchitectonics

MXenes vs. clays: emerging and traditional 2D layered nanoarchitectonics

Carbon Nanofibrous Aerogels Derived from Electrospun Polyimide for Multifunctional Piezoresistive Sensors

Bubbles-Induced Porous Structure-Based Flexible Piezoresistive Sensors for Speech Recognition

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