Multiscale Hierarchical Design of a Flexible Piezoresistive Pressure Sensor with High Sensitivity and Wide Linearity Range

Shi, Jidong; Wang, Liu; Dai, Zhaohe; Zhao, Lingyu; Du, Mingde; Li, Hongbian; Fang, Ying

doi:10.1002/smll.201800819

Cited by 398 publications

(267 citation statements)

References 57 publications

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“…The initial resistance and pressure‐sensing performances of the #60 MM sensors with different LBL assembly cycles were also tested (Figure S14, Supporting Information). In previous research, it was difficult to give consideration to both high sensitivity and wide range . As can be seen in Figure b, few sensors have a test pressure‐range up to 400 kPa, while the MM pressure sensor exhibits an excellent pressure‐sensing performance with ultrahigh sensitivities and ultrawide pressure‐range (0.01–400 kPa).…”

Section: Resultsmentioning

confidence: 97%

Multilevel Microstructured Flexible Pressure Sensors with Ultrahigh Sensitivity and Ultrawide Pressure Range for Versatile Electronic Skins

Tang

Gan

et al. 2019

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Flexible pressure sensors as electronic skins have attracted wide attention to their potential applications for healthcare and intelligent robotics. However, the tradeoff between their sensitivity and pressure range restricts their practical applications in various healthcare fields. Herein, a cost‐effective flexible pressure sensor with an ultrahigh sensitivity over an ultrawide pressure‐range is developed by combining a sandpaper‐molded multilevel microstructured polydimethylsiloxane and a reduced oxide graphene film. The unique multilevel microstructure via a two‐step sandpaper‐molding method leads to an ultrahigh sensitivity (2.5–1051 kPa−1) and can detect subtle and large pressure over an ultrawide range (0.01–400 kPa), which covers the overall pressure regime in daily life. Sharp increases in the contact area and additional contact sites caused by the multilevel microstructures jointly contribute to such unprecedented performance, which is confirmed by in situ observation of the gap variations and the contact states of the sensor under different pressures. Examples of the flexible pressure sensors are shown in potential applications involving the detection of various human physiological signals, such as breathing rate, vocal‐cord vibration, heart rate, wrist pulse, and foot plantar pressure. Another object manipulation application is also demonstrated, where the material shows its great potential as electronic skin intelligent robotics and prosthetic limbs.

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Section: Resultsmentioning

confidence: 97%

Multilevel Microstructured Flexible Pressure Sensors with Ultrahigh Sensitivity and Ultrawide Pressure Range for Versatile Electronic Skins

Tang

Gan

et al. 2019

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196

174

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“…Considering that the sensitivity was usually different in the whole range, the available range would be further narrowed down, which set higher demands for flexible pressure sensors. In recent reports, researchers effectively promoted the linearity range and the sensitivity of flexible pressure sensors by employing hierarchical and irregular microstructures, combining rough surfaces with compressible bulk structures, or introducing multilayered active materials . In spite of these great achievements, few existing flexible pressure sensors can retain both good linearity and high sensitivity (over 10 kPa −1 ) in the range up to 100 kPa, let alone those composed of a surface microstructure and conductive layer.…”

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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“…Traditionally, the sound recording involves the process of transducing acoustic wave to the digital signal in the microphone. Recently, sensing strain and vibration of the human throat for word recognition has been achieved among 2D materials based strain or pressure sensors . For the throat motions detection, a high‐sensitive, microscale, and flexible strain or pressure sensor is an ideal candidate because of small strain change for the thousands of vocabularies.…”

Section: Human Physical Signals Detectionmentioning

confidence: 99%

Wearable Electronics Based on 2D Materials for Human Physiological Information Detection

Pang

Yang

et al. 2019

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The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10. 1002/smll.201901124. Recently, advancement in materials production, device fabrication, and flexi ble circuit has led to the huge prosperity of wearable electronics for human healthcare monitoring and medical diagnosis. Particularly, with the emergence of 2D materials many merits including light weight, high stretchability, excellent biocompatibility, and high performance are used for those potential applications. Thus, it is urgent to review the wearable electronics based on 2D materials for the detection of various human signals. In this work, the typical graphene-based materials, transition-metal dichalcogenides, and transition metal carbides or carbonitrides used for the wearable electronics are discussed. To well understand the human physiological information, it is divided into two dominated categories, namely, the human physical and the human chemical signals. The monitoring of body temperature, electrograms, subtle signals, and limb motions is described for the physical signals while the detection of body fluid including sweat, breathing gas, and saliva is reviewed for the chemical signals. Recent progress and development toward those specific utilizations are highlighted in the Review with the representative examples. The future outlook of wearable healthcare techniques is briefly discussed for their commercialization. Wearable Electronics

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Multiscale Hierarchical Design of a Flexible Piezoresistive Pressure Sensor with High Sensitivity and Wide Linearity Range

Cited by 398 publications

References 57 publications

Multilevel Microstructured Flexible Pressure Sensors with Ultrahigh Sensitivity and Ultrawide Pressure Range for Versatile Electronic Skins

Multilevel Microstructured Flexible Pressure Sensors with Ultrahigh Sensitivity and Ultrawide Pressure Range for Versatile Electronic Skins

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

Wearable Electronics Based on 2D Materials for Human Physiological Information Detection

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