Advances of flexible pressure sensors toward artificial intelligence and health care applications

Zang, Yaping; Zhang, Fengjiao; Di, Chong‐an; Zhu, Daoben

doi:10.1039/c4mh00147h

Cited by 1,102 publications

(852 citation statements)

References 120 publications

(259 reference statements)

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“…For practical applications of the piezoresistive e-skins in healthcare monitoring devices, the detection of various bio-signals was compared over a wide range of pressures, from acoustic wave (<1 Pa) and human breath (1 Pa-1 kPa) to human pulse pressure (1-10 kPa, e.g., artery pulse pressure, average 30-40 mmHg, 4-5.3 kPa) and carotid pulse pressure (average 35 mmHg, 4.67 kPa) 34,35 . The Fig.…”

Section: Healthcare Device Applications Of Microstructured E-skinsmentioning

confidence: 99%

Tailoring force sensitivity and selectivity by microstructure engineering of multidirectional electronic skins

et al. 2018

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Electronic skins (e-skins) with high sensitivity to multidirectional mechanical stimuli are crucial for healthcare monitoring devices, robotics, and wearable sensors. In this study, we present piezoresistive e-skins with tunable force sensitivity and selectivity to multidirectional forces through the engineered microstructure geometries (i.e., dome, pyramid, and pillar). Depending on the microstructure geometry, distinct variations in contact area and localized stress distribution are observed under different mechanical forces (i.e., normal, shear, stretching, and bending), which critically affect the force sensitivity, selectivity, response/relaxation time, and mechanical stability of e-skins. Microdome structures present the best force sensitivities for normal, tensile, and bending stresses. In particular, microdome structures exhibit extremely high pressure sensitivities over broad pressure ranges (47,062 kPa −1 in the range of <1 kPa, 90,657 kPa −1 in the range of 1-10 kPa, and 30,214 kPa −1 in the range of 10-26 kPa). On the other hand, for shear stress, micropillar structures exhibit the highest sensitivity. As proof-of-concept applications in healthcare monitoring devices, we show that our e-skins can precisely monitor acoustic waves, breathing, and human artery/carotid pulse pressures. Unveiling the relationship between the microstructure geometry of e-skins and their sensing capability would provide a platform for future development of high-performance microstructured e-skins.

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Section: Healthcare Device Applications Of Microstructured E-skinsmentioning

confidence: 99%

Tailoring force sensitivity and selectivity by microstructure engineering of multidirectional electronic skins

et al. 2018

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“…The usage of more than of conductive material allowed the sensor to be used in different mediums. These pressure sensors are also used for tactile sensing [68,69] and artificial intelligence [21,70]. Some of the strain sensors [71] developed and tested in the laboratory had provided a change in conductivity up to a strain of 300% having a GF of 50.…”

Section: Types Of Sensing Using Wearable Flexible Sensorsmentioning

confidence: 99%

“…OLAE process is currently used to develop wearable health and medical devices. Use of PDMS [14,15], PEN [16], PI [17], P(VDF-TrFE) [18], Parylene [19] and Polypyrrole [20] have been commonly done to develop flexible sensors [21] for different applications. The electrode part of the sensor has been developed from different conducting materials like carbon-based nanomaterials and metallic nanoparticles.…”

Section: Materials For Wearable Flexible Sensorsmentioning

confidence: 99%

Wearable Flexible Sensors: A Review

2017

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Abstract-The paper provides a review on some of the significant research work done on wearable flexible sensors (WFS). Sensors fabricated with flexible materials have been attached to a person along with the embedded system to monitor a parameter and transfer the significant data to the monitoring unit for further analyses. The use of wearable sensors has played a quite important role to monitor physiological parameters of a person to minimize any malfunctioning happening in the body. The paper categorizes the work according to the materials used for designing the system, the network protocols and different types of activities that were being monitored. The challenges faced by the current sensing systems and future opportunities for the wearable flexible sensors regarding its market values are also briefly explained in the paper.

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“…Detection of ultra-low mechanical pressure changes in the range of few Pascal in an atmospheric environment is of high a technological interest in various applications such as a remote infants breathing monitoring [1], a leakage alert of hazardous gases [2], a mechanical stability control of intelligent systems [1] and acoustic propagation disturbances [3]. A substantial progress in detection of low mechanical pressure changes has been achieved during the last decade through various methods [1].…”

Section: Introduction mentioning

confidence: 99%

“…A substantial progress in detection of low mechanical pressure changes has been achieved during the last decade through various methods [1]. The piezoelectric detection method has many advantages owing to its passive detection mode, low energy consumption [4], high sensitivity and fast response [5].…”

Section: Introduction mentioning

confidence: 99%

Highly Sensitive Piezoelectric Response of Sodium Nitrite Nano-crystals to Low Applied Mechanical Pressures

Bishara¹,

Berger²

2018

JMSE-A

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Development of highly-sensitive detectors of low mechanical pressures in the scale of few Pascal and below in environmental conditions are of a high technological demand for a variety of applications such as a remote control of infants breathing and a leakage alert of hazardous gases. This paper reports on a highly sensitive piezoelectric detector of low applied mechanical pressures down to 0.1 Pa in atmospheric environment (10 -4 % pressure change). It is made of SN (sodium nitride) nanocrystals grown inside alumina pores with a preferred crystallographic orientation that can be controlled by their formation conditions based on a thermodynamic driving force. The SN nanocrystals inside the pores show a piezoelectric current response to low applied mechanical pressure which depends on the crystallographic orientation of the crystals and the level of residual or applied static strains. The piezoelectric current response is correlated with the unique molecular structure of the SN crystals.

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Advances of flexible pressure sensors toward artificial intelligence and health care applications

Cited by 1,102 publications

References 120 publications

Tailoring force sensitivity and selectivity by microstructure engineering of multidirectional electronic skins

Tailoring force sensitivity and selectivity by microstructure engineering of multidirectional electronic skins

Wearable Flexible Sensors: A Review

Highly Sensitive Piezoelectric Response of Sodium Nitrite Nano-crystals to Low Applied Mechanical Pressures

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