A highly flexible and sensitive piezoresistive sensor based on MXene with greatly changed interlayer distances

Ma, Yanan; Liu, Nishuang; Li, Luying; Hu, Xiaokang; Zou, Zhengguang; Wang, Jianbo; Luo, Shijun; Gao, Yihua

doi:10.1038/s41467-017-01136-9

Cited by 597 publications

(435 citation statements)

References 38 publications

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“…Its compressible sheets‐laminated structure is a crucial factor to change the MXene internal resistance and the conductivity of the MXenes. Nevertheless, the present MXene based pressure sensor quickly reached the deformation limit of MXenes in limited space of the 2D plane under the external stimulation, which considerably restricts the sensor's performance. Additionally, most of the previous studies just focused on the sensitivity or limit of pressure detection or other indicators, while few of them could perceive the multifunctional microforce within one simple structure, like sounds, touch, and motion recognition.…”

Section: Introductionmentioning

confidence: 98%

Microchannel‐Confined MXene Based Flexible Piezoresistive Multifunctional Micro‐Force Sensor

Gao

Huang

et al. 2020

Adv Funct Materials

268

229

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Multifunctional micro‐force sensing in one device is an urgent need for the higher integration of the smaller flexible electronic device toward wearable health‐monitoring equipment, intelligent robotics, and efficient human–machine interface. Herein, a novel microchannel‐confined MXene‐based flexible piezoresistive sensor is demonstrated to simultaneously achieve multi‐types micro‐force sensing of pressure, sound, and acceleration. Benefiting from the synergistically confined effect of the fingerprint‐microstructured channel and the accordion‐microstructured MXene materials, the as‐designed sensor remarkably endows a low detection limit of 9 Pa, a high sensitivity of 99.5 kPa−1, and a fast response time of 4 ms, as well as non‐attenuating durability over 10 000 cycles. Moreover, the fabricated sensor is multifunctionally capable of sensing sounds, micromotion, and acceleration in one device. Evidently, such a multifunctional sensing characteristic can highlight the bright prospect of the microchannel‐confined MXene‐based micro‐force sensor for the higher integration of flexible electronics.

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Section: Introductionmentioning

confidence: 98%

Microchannel‐Confined MXene Based Flexible Piezoresistive Multifunctional Micro‐Force Sensor

Gao

Huang

et al. 2020

Adv Funct Materials

268

229

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“…There are more than 70 known M n +1 AX n or MAX phases, indicating that numerous MXenes of varying compositions could be explored . MXene's rich chemistries and unique 2D morphologies have sparked intense interest in the exploitation of MXenes for energy storage, catalysis, conductive reinforcement additives, and chemical sensing . As a typical case in MXene family, Ti 3 C 2 T x MXene has metallic conductivity and shows amazing electrochemical activity, which could be highly beneficial in sensor development for various diagnostic purposes .…”

Section: Introductionmentioning

confidence: 99%

A MXene‐Based Wearable Biosensor System for High‐Performance In Vitro Perspiration Analysis

Lei

Zhao

Zhang

et al. 2019

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Wearable electrochemical biosensors for sweat analysis present a promising means for noninvasive biomarker monitoring. However, sweat‐based sensing still poses several challenges, including easy degradation of enzymes and biomaterials with repeated testing, limited detection range and sensitivity of enzyme‐based biosensors caused by oxygen deficiency in sweat, and poor shelf life of sensors using all‐in‐one working electrodes patterned by traditional techniques (e.g., electrodeposition and screen printing). Herein, a stretchable, wearable, and modular multifunctional biosensor is developed, incorporating a novel MXene/Prussian blue (Ti3C2Tx/PB) composite designed for durable and sensitive detection of biomarkers (e.g., glucose and lactate) in sweat. A unique modular design enables a simple exchange of the specific sensing electrode to target the desired analytes. Furthermore, an implemented solid–liquid–air three‐phase interface design leads to superior sensor performance and stability. Typical electrochemical sensitivities of 35.3 µA mm−1 cm−2 for glucose and 11.4 µA mm−1 cm−2 for lactate are achieved using artificial sweat. During in vitro perspiration monitoring of human subjects, the physiochemistry signals (glucose and lactate level) can be measured simultaneously with high sensitivity and good repeatability. This approach represents an important step toward the realization of ultrasensitive enzymatic wearable biosensors for personalized health monitoring.

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“…To date, plenty of pressure sensors have been explored, including capacitive, [2,3] piezoelectrical, [4][5][6] and piezoresistive [7,8] pressure sensors. To date, plenty of pressure sensors have been explored, including capacitive, [2,3] piezoelectrical, [4][5][6] and piezoresistive [7,8] pressure sensors.…”

mentioning

confidence: 99%

Hollow MXene Sphere/Reduced Graphene Aerogel Composites for Piezoresistive Sensor with Ultra‐High Sensitivity

Zhu

Yang

Cheng

et al. 2019

Adv Elect Materials

Self Cite

145

125

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can effectively capture subtle changes of pressures is much needed. To date, plenty of pressure sensors have been explored, including capacitive, [2,3] piezoelectrical, [4][5][6] and piezoresistive [7,8] pressure sensors. Among them, piezoresistive sensors stand out as promising candidates due to their low-cost fabrication, stability to temperature, sensitivity to pressure, etc. Piezoresistive pressure sensors can transduce changes of mechanical strain into changes of electrical resistance, and are broadly used due to their simple work mechanism and sensitivity to pressure. [9] Conventional piezoresistive pressure sensors, however, are usually based on rigid substrates like Si, [10] which are not skin-mountable and cannot meet the needs for portability and flexibility of smart wearable electronic devices. To tackle this problem, one possible way is the combination of flexible insulating matrices with carbonaceous nanomaterials as conductive fillers, such as graphene, [11] reduced graphene oxide (rGO), [12] and carbon nanotubes (CNTs). [13] For example, Park et al. combined wrinkled CNT and PDMS to build a pressure sensor [14] and more recently, Pang et al. prepared a pressure sensor based on rGO and micro-patterned PDMS substrate. [15] However, composite flexible pressure sensors like these often suffer from a performance compromise between sensor sensitivity and linear region. [16] Apart from that, the signal stability of the sensor may be influenced by the thermal expansion of the polymer substrate. [9] Another way is the utilization of the carbonaceous nanomaterials as the building blocks for making highly elastic materials. In particular, carbon aerogels prepared by this method have demonstrated extraordinary mechanical properties, [17] good flexibility, [18] high aspect ratio, [19] and exceptional thermal stability. [20] Over the past few years, a considerable amount of reports have focused on piezoresistive pressure sensors based on reduced graphene oxide (rGO) aerogel or rGO composite aerogel. For instance, Ha et al. prepared a PAA/ rGO composite aerogel for pressure sensing, [21] and recently, Peng et al. made a piezoresistive sensor based on CNT/rGO-CNF aerogel. [22] However, it still remains a challenge to further improve the sensitivity and the detecting range of these carbon aerogel based pressure sensors.Recently, a new kind of 2D transitional metal carbide/carbonitride materials (MXenes) with metal conductivity have Pressure sensing is key to smart wearable electronics and human-machine interaction interfaces. To achieve a high-performance pressure sensor that has broad linear range and is capable of detecting subtle changes of pressure, the good choice of sensing materials and rational design of structures are both needed. A novel piezoresistive sensor based on hollow MXene spheres/ reduced graphene composite aerogel and flexible interdigital electrodes is presented. Benefiting from the unique microstructure of the composite aerogel, the prepared pressure sensor exhibits high sensitivity (609 kPa −...

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A highly flexible and sensitive piezoresistive sensor based on MXene with greatly changed interlayer distances

Cited by 597 publications

References 38 publications

Microchannel‐Confined MXene Based Flexible Piezoresistive Multifunctional Micro‐Force Sensor

Microchannel‐Confined MXene Based Flexible Piezoresistive Multifunctional Micro‐Force Sensor

A MXene‐Based Wearable Biosensor System for High‐Performance In Vitro Perspiration Analysis

Hollow MXene Sphere/Reduced Graphene Aerogel Composites for Piezoresistive Sensor with Ultra‐High Sensitivity

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