Accurate Monitoring of Small Strain for Timbre Recognition via Ductile Fragmentation of Functionalized Graphene Multilayers

Yang, Tingting; Wang, Wen; Huang, Yuehua; Jiang, Xin; Zhao, Xuanliang

doi:10.1021/acsami.0c16855

Cited by 18 publications

(16 citation statements)

References 44 publications

(69 reference statements)

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“…The first factor is the connectivity variation in SCNTNs, which is often considered as a main reason for resistance change in many piezoresistive sensors. [ 21,51,52 ] However, the case was different in this work. It was found that the topology of an SCNTN retained nearly unchanged when the gas velocity was in its detection range, and thus no resistance change should be generated if they were caused by the connectivity changes.…”

Section: Resultsmentioning

confidence: 78%

Ultrasensitive Airflow Sensors Based on Suspended Carbon Nanotube Networks

et al. 2022

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applications. Recently, bionic fluffy fabrics learning from many animals, such as crickets and spiders, were reported to fabricate airflow sensors but usually exhibited low sensitivity and slow response speed against different airflows. [9,10] Therefore, the rational design and controllable fabrication of airflow sensors are urgently needed to tackle their issues of poor performance.For piezoresistive materials, sufficient deformation under external forces is the prerequisite for causing resistance variations, which calls for the excellent flexibility of the component materials. Besides, lightweight materials are easy to change their states of motion due to their low inertia, ensuring a fast response to external stimuli. For composite-based sensors, the interfacial areas within the composites should also be reduced because the interfaces often behave like capacitors under external electrical fields, [11] which inevitably causes a decline in the response speed of sensors owing to the charging-discharging processes. Therefore, from the perspective of material selection, flexible and lightweight materials with small interfacial areas show more advantages in fabricating highly sensitive and responsive piezoresistive sensors.Carbon nanotubes (CNTs) are supposed to be ideal candidates for fabricating high-performance piezoresistive airflow sensors because of their intrinsic properties, such as nanosized diameters, high aspect ratio and flexibility, low density, and excellent mechanical and electrical properties, [12,13] which fully meet the requirements for airflow sensors. However, the previous attempts to incorporate CNTs with other materials for making airflow sensors usually produced mixed bulky structures with declined mechanical properties, thus degrading their performance as sensors. [14][15][16][17][18] For example, the response time of many CNT-based sensors generally ranges from one to several seconds, [9,[19][20][21] which is far inferior to the expected performance of individual CNT-based sensors. [22][23][24] In previous studies, carbonized silk fabric (CSF) decorated with fluffylike CNTs were developed as piezoresistive airflow sensors, of which the sensing performance was simultaneously determined by the properties of CSF and CNTs. [9] Although the CNT assembly with a foam-like structure was capable of sensing very mild airflows, its response time was ≈1.3 s, which could High-performance airflow sensors are in great demand in numerous fields but still face many challenges, such as slow response speed, low sensitivity, large detection threshold, and narrow sensing range. Carbon nanotubes (CNTs) exhibit many advantages in fabricating airflow sensors due to their nanoscale diameters, excellent mechanical and electrical properties, and so on. However, the intrinsic extraordinary properties of CNTs are not fully exhibited in previously reported CNT-based airflow sensors due to the mixed structures of macroscale CNT assemblies. Herein, this article presents suspended CNT networks (SCNTNs) as high-performance a...

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Section: Resultsmentioning

confidence: 78%

Ultrasensitive Airflow Sensors Based on Suspended Carbon Nanotube Networks

et al. 2022

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“…Currently, with the rapid development of soft electronic technologies, the application of flexible strain sensors tends to be increasingly extensive, including electronic skins, − human-computer interactions, physiological parameter monitoring, , soft robots, , and other high-tech fields . To fabricate these sensors, various transduction mechanisms, such as piezoresistive, capacitive, piezoelectric, triboelectric, liquid metal, etc., have been adopted. On the basis of the above mechanisms, two main types of sensors have been widely developed: particular structural types and functional material types. − The former type includes serpentine, wrinkle, pillar, crack, and interlock, offering advantages such as high sensitivity, low hysteresis, and fast response.…”

Section: Introductionmentioning

confidence: 99%

A Selective-Response Bioinspired Strain Sensor Using Viscoelastic Material as Middle Layer

Wang

Zhang

et al. 2021

ACS Nano

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Flexible strain sensors have an irreplaceable role in critical and emerging fields, such as electronic skins, flexible robots, and prosthetics. Although numerous efforts have been made to improve sensor sensitivity to meet specific application scenarios, the signal-to-noise ratio (SNR) is an extremely critical and non-negligible indicator, which takes into account higher sensitivity, meaning that they can also detect the noise signals with high sensitivity. Coincidentally, scorpions with ultrasensitive vibration sensilla also face such a dilemma. Here, it is found that the scorpion ingeniously uses the viscoelastic material in front of its slit sensilla to realize efficient preprocessing of the signal. Its mechanism is that the loss factor of materials changes with frequency, affecting energy storage and transmission. Inspired by this ingenious strategy, a bioinspired strain sensor insensitive to a low strain rate was designed using a two-step template transfer method. As a result, its relative change in resistance reached 110% under the same strain (0.3197%) but with different strain rates (0.1 Hz and ∼20 Hz). The noncontact vibration experiments also show different responses to low-frequency vibration and high-frequency impact. Moreover, it can also be used as a typical flexible strain sensor. Under the tensile state, it has a gauge factor (GF) as high as 4596 upon 0.6% strain, and the response time is 140 ms. Therefore, it is expected that this strain sensor will be used in many important ultraprecision measurement fields, especially when the measured signal is small.

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“…, ε : 0–5%, GF < 100), which cannot meet the requirements of dynamic strain sensing yet. As for the existing strain sensors that have favorable dynamic sensing ability, they generally possess a limited stretchability ( ε < 2%) 2,3,38,39,47 and a relatively narrow frequency detection range (<1000 Hz), 3,38,39,69 which can't be applied in scenarios such as concerning ultrahigh frequency as well as small/large strains simultaneously involved.…”

Section: Resultsmentioning

confidence: 99%

“…21,33,35 However, microcracking-based strain sensors generally have low stretchability due to the intrinsic lack of flexibility in the strain-sensing layer. 2,3,19,30,32,38,47 On the other hand, several strategies have been developed to improve the stretchability of strain sensors, e.g. , introduction of one-dimensional (1D) or two-dimensional (2D) conductive nanomaterials into the strain-sensing layer and/or design of stretchable surface structures ( e.g.…”

Section: Introductionmentioning

confidence: 99%