High‐Performance Pressure Sensors Based on 3D Microstructure Fabricated by a Facile Transfer Technology

Liu, Chunrui; Huang, Zehua; Zheng, Jiwen; Xu, Huihua; Chu, Sheng; Wu, Jin; Han, Songjia

doi:10.1002/admt.201800640

Cited by 71 publications

(59 citation statements)

References 62 publications

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“…A self‐healing strain sensor was integrated by sandwiching a thin layer of high conductivity graphene between two layers of SPU‐DTs as shown in Figure S12a, Supporting Information. Compared with photolithography and biomimetic methods, [ 51–54 ] the conductive network construction method used in this paper is simpler and can be prepared in a large area in practical application as shown in Figure S12b, Supporting Information. At the same time, due to most conductive hydrogels cannot be formed, they have great limitations in the preparation of large‐area flexible sensors.…”

Section: Resultsmentioning

confidence: 99%

Self‐Healing Polyurethane Elastomer Based on Crosslinked‐Linear Interpenetrating Structure: Preparation, Properties, and Applications

Liu

Zhou

et al. 2021

Macro Materials & Eng

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Despite tremendous advances in the preparation of self‐healing flexible strain sensor devices, it remains a great challenge to large‐area synthesis, relatively high mechanical strength, and sensitive sensing properties into one self‐healing materials system, which have received increasing interests because of their many potential applications. Herein, the design and synthesis of a crosslinked‐linear interpenetrating structure polymer containing disulfide and hydrogen bonds is reported to address this conundrum. The resulting self‐healable polymer is highly stretchable (up to 551.7%) with a high tensile strength (4.14 MPa) and excellent healing efficiency of similar to 90% at mild temperature without using any external reagents. Furthermore, a novel method for fabricating flexible sensor is also proposed to endow the resulted sensor with large‐area (20 cm × 12 cm), low cost, and outstanding sensitivity to strain, which makes it very suitable for human motion monitoring applications. This work will provide afflatus on future design, fabrication, and application of self‐healing flexible strain sensor devices.

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Section: Resultsmentioning

confidence: 99%

Self‐Healing Polyurethane Elastomer Based on Crosslinked‐Linear Interpenetrating Structure: Preparation, Properties, and Applications

Liu

Zhou

et al. 2021

Macro Materials & Eng

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“…However, the procedures are complex, costly, and hard to upscale. To reduce the costs, the plant organs (like lotus leaves and rose petals), silk, and sandpaper with natural textures were employed as replica molds. These methods provided convenient ways to acquire complex microstructures and thus form high‐performance sensors at the lab scale.…”

Section: Introductionmentioning

confidence: 99%

Flexible Pressure Sensors with Wide Linearity Range and High Sensitivity Based on Selective Laser Sintering 3D Printing

Zhang

et al. 2019

Adv Materials Technologies

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applications in electronic skin (E-skin), human-machine interfaces, and healthcare monitoring. [1][2][3][4] Among the various types of sensors employing piezoresistive, [5][6][7] capacitive, [8][9][10] piezoelectric, [11][12][13] and triboelectric [14][15][16] sensing mechanisms, the piezoresistive mechanisms have been intensively investigated due to their high sensitivity, simple structures, easy fabrication, and convenient data processing, resulting in significantly promising commercialization prospects. [17][18][19] To achieve success in practical applications, excellent performances in the pressure range related to human activity and scalable, low-cost, and reproducible manufacturing processes are decidedly required. [20][21][22][23] Piezoresistive pressure sensors based on composite materials consisting of elastic matrixes and conductive fillers have been comprehensively investigated and adopted in commercial applications due to their good performance and compatibility with scalable printing technology. [3,21,24] However, the sensors based on bulk resistance changes generally exhibited poor sensitivity in low pressure ranges, which limited their applications in E-skin or wearable devices. To break the bottleneck, flexible pressure sensors composed of surface microstructures and conductive layers were proposed, in which the signals were typically generated from the variation of the contact resistance. [25,26] The transformed working mechanism greatly promoted the sensitivity up to 10-100 kPa −1 (especially in the low pressure range) and decreased the limit of detection (LOD) to 1 Pa or less. [26][27][28] Nonetheless, for plenty of microstructure-based sensors, the response ranges with high sensitivity were limited to several kPa since the contact areas of the microstructures were easily saturated under small pressure. First, the narrow range would limit their applications in the medium-pressure range [29,30] (10-100 kPa), which is closely related to daily human activity. Second, the background stress that is generated from nontest objects can easily disable a sensor with a narrow sensing range. [31,32] In addition to the sensing range, a linear relationship between the pressure and the electrical signals was typically desired to facilitate data processing. [21,33] Considering that the sensitivity was usually different in the whole range, the available range would be further narrowed down, which set To achieve practical applications of flexible pressure sensors, good performance and scalable manufacturing processes are both desired. Here, flexible pressure sensors with excellent performance are fabricated via selective laser sintering (SLS). Having benefitted from the irregular microstructures generated in the powder sintering process, the sensors exhibit high sensitivity of 55 kPa −1 in a wide linearity range of 100 kPa, and they maintain decent sensitivity (>10 kPa −1 ) over a high-pressure range (100-400 kPa), which is among the best results for flexible pressure sensors. The working mechanism of the sensor...

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“…Piezoresistive pressure sensors detect the pressure by the variation in resistance of devices during deformation, as shown in Figure 2a. In this type of devices, the composite films comprised of elastic matrix mixed with conductive fillers (i.e., metal nanowires, [ 97 ] carbon nanotubes [CNTs], [ 98 ] and graphene [ 99,100 ] ) or the intrinsic conducting polymers [ 101,102 ] are usually adopted as the functional layer either laid on interdigitated electrode or sandwiched between two electrodes. [ 103 ] When the normal force is applied, [ 101 ] the contact resistance ( R c ) changes due to the change in contact area [ 104 ] or contact point [ 105 ] in the materials.…”

Section: Mechanismsmentioning

confidence: 99%

Flexible pressure sensors with microstructures

Tang

Liu

et al. 2021

Nano Select

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Microstructured flexible pressure sensors featured with good mechanical properties, boosting a variety of sophisticated application scenarios, including electronic skin (e-skin), soft robotics, wearable electronics, etc. This review is very focusing on the recent research progress of microstructured flexible pressure sensors. For better understanding the corresponding devices, different mechanisms, materials, preparation methods are briefly introduced at the beginning. And with highlighting the significance of microstructure for device performance, the microstructures of different configurations (e.g., pyramid, pillar, hemisphere) are introduced and discussed in detail through analyzing the influence of configuration characteristics and material properties. Finally, according to the existing problems in the application, the research directions of flexible pressure sensor are prospected. Currently, catering to the explosive and ineluctable growth of this intelligent world, considerable microstructured flexible pressure sensors have emerged but their development is still at very first stage. In this review, some guidelines and tunable methods are suggested for the microstructured flexible pressure sensors of wide practical use in the future.

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High‐Performance Pressure Sensors Based on 3D Microstructure Fabricated by a Facile Transfer Technology

Cited by 71 publications

References 62 publications

Self‐Healing Polyurethane Elastomer Based on Crosslinked‐Linear Interpenetrating Structure: Preparation, Properties, and Applications

Self‐Healing Polyurethane Elastomer Based on Crosslinked‐Linear Interpenetrating Structure: Preparation, Properties, and Applications

Flexible Pressure Sensors with Wide Linearity Range and High Sensitivity Based on Selective Laser Sintering 3D Printing

Flexible pressure sensors with microstructures

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