A High-Performance Flexible Pressure Sensor Realized by Overhanging Cobweb-like Structure on a Micropost Array

Zhang, Weiguan; Xiao, Yan; Duan, Yingying; Li, Ning; Wu, Linlin; Lou, Yan; Wang, Hao; Peng, Zhengchun

doi:10.1021/acsami.0c12369

Cited by 66 publications

(50 citation statements)

References 48 publications

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“…Detailed comparisons are listed in Table S1 (Supporting Information). [29][30][31][32][33][34][35][36][37][38] These results indicate that CNT-Silk/BOPP composite films can be used in pressure-sensing devices for further applications.…”

Section: Pressure-perceptive Performance Of the Cnt-silk/bopp Pressur...mentioning

confidence: 99%

Pressure‐Perceptive Actuators for Tactile Soft Robots and Visual Logic Devices

et al. 2021

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Soft actuators with sensing capabilities are important in intelligent robots and human-computer interactions. However, present perceptive actuating systems rely on the integration of multiple functional units with complex circuit design. Here, a new-type pressure-perceptive actuator is reported, which integrates functions of sensing, actuating, and decision making at material level without complex combination. The actuator is composed of an actuating unit and a pressure-sensing unit, both of which are fabricated by carbon nanotube (CNT), silk, and polymer composite. On the one hand, the actuating unit can be driven by low voltages (<13 V), owing to a Joule-heating effect. On the other hand, the current passing the pressure-sensing unit can be controlled by tactile pressure. In the integrated actuator, it is able to control the deformation amplitude of actuating unit by applying different pressures on the pressure-sensing unit. A portable tactile-activated gripper is fabricated to operate an object through pressure control, demonstrating its application in tactile soft robots. Finally, three visual logic gates (AND, OR, and NOT) are proposed, which convert "tactile" inputs into "visible" deformation outputs, using the CNT-silk-based material for sensing and actuating in the decision-making process. This study provides a new path for intelligent soft robots and new-generation logic devices.

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Section: Pressure-perceptive Performance Of the Cnt-silk/bopp Pressur...mentioning

confidence: 99%

Pressure‐Perceptive Actuators for Tactile Soft Robots and Visual Logic Devices

et al. 2021

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“…[ 1–4 ] They can convert pressure into electrical signals, [ 5,6 ] which can be used in many aspects of life, including bionic limb, [ 7,8 ] health exercise monitoring, [ 9 ] medical equipment, [ 10 ] and so on. According to the different working mechanisms, pressure sensors can be further divided into piezoresistive sensors, [ 11–13 ] piezoelectric sensors, [ 14 ] and capacitive sensors, [ 15,16 ] among which piezoresistive sensors have been widely investigated due to their excellent features like sensitive response, flexible deformation methods, excellent stability, and easy assembly. [ 17–19 ] Generally, piezoresistive sensors work on the principle of regulating the internal structure of conductive materials to cause a change in resistance.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4] They can convert pressure into electrical signals, [5,6] which can be used in many aspects of life, including bionic limb, [7,8] health exercise monitoring, [9] medical equipment, [10] and so on. According to the different working mechanisms, pressure sensors can be further divided into piezoresistive sensors, [11][12][13] piezoelectric sensors, [14] and capacitive sensors, [15,16] among which piezoresistive sensors have been widely investigated due to their excellent features like sensitive response, (aPAN) nanofibers serve as a scaffold to support the entire aerogel network. Benefiting from the synergy effect among aPANFs, MXene, and rGO, the aerogel exhibits extremely high sensitivity (331 kPa −1 from 0 to 500 Pa, 126 kPa −1 from 500 Pa to 7.5 kPa), fast response time (71 ms load, 15 ms recovery), and excellent structural stability (17 000 cycles of compression).…”

Section: Introductionmentioning

confidence: 99%

Ultralight and Hyperelastic Nanofiber‐Reinforced MXene–Graphene Aerogel for High‐Performance Piezoresistive Sensor

Niu

Qin

Min

et al. 2021

Adv Materials Technologies

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flexible deformation methods, excellent stability, and easy assembly. [17][18][19] Generally, piezoresistive sensors work on the principle of regulating the internal structure of conductive materials to cause a change in resistance. [20] Therefore, constructing suitable conductive materials is crucial in developing high-performance piezoresistive sensors.Recently, 3D aerogel-based conductive materials have been regarded as ideal candidates for piezoresistive sensors due to their high porosity, good elasticity, and low density. [21] The selection of sensing materials in conductive aerogels is generally focused on nanoparticles, conductive polymers, and carbon materials. [22][23][24] Among them, graphene-based aerogel plays a vital role in piezoresistive sensors due to its unique physical and chemical properties. [25] However, the poor conductivity of graphene aerogel always causes low sensitivity in the piezoresistive sensor, which significantly limits its practical application in the sensing field.MXene is a graphene-like 2D material composed of transition metal carbides/nitrides or carbides. [26] The general chemical formula of MXene is M n+1 X n T x , where M is a transition metal, X is C or N, and T x represents a functional group. The good electrical conductivity of MXene enables it to be a potential alternative for piezoresistive sensor sensing materials. [27] Unfortunately, similar to other 2D materials, MXene is easy to stack, which may reduce the service life of the piezoresistive devices. Besides, the low aspect ratio and weak gelling ability of MXene nanosheets make it difficult to form a continuous porous structure. [28] Though intense efforts have been made to apply MXene to piezoresistive sensors, [29] it is still a big challenge to prepare MXene-based aerogels as piezoresistive sensors with high sensing performance, fast response time, and excellent fatigue resistance.Herein, we report our success in realizing a highperformance piezoresistive device based on nanofiberreinforced MXene-reduced graphene oxide (rGO) aerogel (named alkaline-treated polyacrylonitrile nanofibers (aPANFs)/ MX-rGA). The aPANFs/MX-rGA has a 3D interconnected porous structure, in which alkaline-treated polyacrylonitrile 3D aerogel-based piezoresistive sensors have attracted tremendous attention due to their high sensitivity and excellent mechanical properties. Here, a novel piezoresistive sensor with ultrahigh linear sensitivity is tactfully designed and prepared based on nanofiber-reinforced MXene-reduced graphene oxide aerogel. The presence of MXene endows the piezoresistive sensor with high conductivity. Besides, the nanofibers can act as a scaffold to improve the compression resilience of the aerogel significantly by penetrating the entire aerogel network. Furthermore, due to the synergy effect among the multiple components, the prepared piezoresistive sensor exhibits outstanding performance, including high linear sensitivity (331 kPa −1 from 0 to 500 Pa, 126 kPa −1 from 500 Pa to 7.5 kPa), fast response time (load 71 ms, ...

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“…The reported research shows two types of microstructures for sensing materials: the first is prepared using the template method, wherein a plate with a special micro surface is used as a template, and a highly conductive thin layer is arranged onto the complex surface of a polymer to form a pyramid structure [ 17 ] and microscale polymeric forests, [ 18 ] indentation, [ 19 ] leaf impression, [ 20 ] fingerprint‐structured channel, [ 21 ] and micro column structure. [ 22 ] An interlocking contact is formed under pressure to increase the effective surface contact area. In this method, the deformation of the micromorphology is the key to improving the sensing effect.…”

Section: Introductionmentioning

confidence: 99%

Breathable, Degradable Piezoresistive Skin Sensor Based on a Sandwich Structure for High‐Performance Pressure Detection

Cai

Liu

et al. 2021

Adv Elect Materials

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Wearable intelligent sensor materials have broad application prospects for human health detection and robot kinematics. 3D structure sensors have the advantages of high sensitivity, a wide detection range, and high strength, as is widely reported in existing research. Here, a sandwich structure involving an encapsulation layer, a 3D conductive network, and an encapsulation layer is prepared. Polyaniline acts as an active conductive filler for the 3D conductive network, while silk fibroin and poly (lactic‐co‐glycolic acid) are used to form a network for carrying conductive materials. Additionally, K‐carrageenan is added to encapsulate the 3D conductive network and prepare a high‐performance green skin sensor. The sensor exhibits high sensitivity (2.54 kPa−1) and a wide linear detection range (165.3 kPa). In addition, the pressure sensor possesses excellent durability (>2000 cycles) and a fast response time of 160 ms. Moreover, the sensor is compatible and biodegradable and encapsulated by a nontoxic water‐soluble polymer. On this basis, skin sensors for health monitoring systems and intelligent interactive systems are reported, thus enabling future applications in medical detection and human–machine interaction.

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A High-Performance Flexible Pressure Sensor Realized by Overhanging Cobweb-like Structure on a Micropost Array

Cited by 66 publications

References 48 publications

Pressure‐Perceptive Actuators for Tactile Soft Robots and Visual Logic Devices

Pressure‐Perceptive Actuators for Tactile Soft Robots and Visual Logic Devices

Ultralight and Hyperelastic Nanofiber‐Reinforced MXene–Graphene Aerogel for High‐Performance Piezoresistive Sensor

Breathable, Degradable Piezoresistive Skin Sensor Based on a Sandwich Structure for High‐Performance Pressure Detection

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