Porous dielectric materials based wearable capacitance pressure sensors for vital signs monitoring: A review

Chittibabu, Suresh Kumar; Krishnamoorthi, C.; Chandrasekhar, Arunkumar

doi:10.1016/j.mssp.2022.106976

Cited by 18 publications

(12 citation statements)

References 161 publications

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“…The pervasiveness of PE based systems for energy recovery can likely be associated both to the ease with which they can be implemented and the relative maturity of the technology. Indeed, triboelectric setups, when applied to energy recovery, are a novel approach that is still being investigated (Chittibabu et al, 2022;Fan et al, 2012;Xiao et al, 2022). Alternators and FPLG's are even more esoteric approaches to the harvesting of energy (Ko et al, 2019;Ren and Wang, 2018) and indeed their adoption seems limited.…”

Section: Analysis Of Existing Designsmentioning

confidence: 99%

A review of hydraulic energy harvester designs – current practice and future improvements

Giunta,

Roscow,

Liu

2024

Proc. Des. Soc.

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This paper addresses the underexplored domain of hydraulic energy harvesters (HEH). Through a literature review, existing designs are identified, aiding in the categorisation of energy conversion technologies and fluid-mechanical interfaces. Recognizing a lack of standardized approaches to testing HEH, the paper proposes a re-configurable test platform. The platform, accommodating diverse configurations, operates at high pressures, aligns with existing hydraulic setups, and functions in static or dynamic modes. This tool aims to assist researchers further explore the implementation of HEHs.

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Section: Analysis Of Existing Designsmentioning

confidence: 99%

A review of hydraulic energy harvester designs – current practice and future improvements

Giunta,

Roscow,

Liu

2024

Proc. Des. Soc.

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“…A tactile sensor is a device capable of recording movement by transforming it into an electrical signal. , The reaction signal of the device illustrates in real time a change in resistance, capacitance, or current generated by the sensing unit of the stimulus. , In particular, tactile sensors, which operate on the principle that the dielectric layer changes capacitance according to the pressure applied to the device, are attracting a lot of attention due to the high sensitivity, long-term stability, and diversity of dielectric materials. − The sensing performance of a capacitive tactile sensor is greatly influenced by the physical and electrical properties of the dielectric material responsible for the dielectric layer among components of the device. − …”

Section: Introductionmentioning

confidence: 99%

Dynamic Covalent Bond Network-Based Carbon Nanocomposite for a Self-Healing Tactile Sensor

Nguyen

Phan

Nam

et al. 2023

ACS Appl. Electron. Mater.

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Capacitive tactile sensors using dielectric polymer materials as dielectric layers have been studied due to their high sensitivity and flexibility with a variety of types of materials in response to external stimuli. However, a polymer-based tactile sensor device is limited in long-term use due to a lack of mechanical stability against repeated external stimuli. In this study, a dynamic covalent polymer-based carbon composite material with high sensitivity, structural stability as well as self-healing ability was manufactured and applied as a capacitive tactile sensor dielectric layer. A polymer chain with a disulfide dynamic covalent bond was used as a composite matrix, and carbon nanofibers were applied as fillers to dramatically increase the dielectric constant of the material. The material-based capacitive tactile sensor not only had a high response signal even at a low external stimulus (0.5 kPa) but also had a high sensitivity (46.7 MPa–1) according to the intensity of the stimulus (0.5–17.5 kPa). In addition, the sensor device had a short response of less than 0.2 s and a recovery time of 0.25 s to external stimuli with a stable response signal for 5000 repetitive stimuli. Furthermore, after self-healing deformation of the dielectric layer, the sensor device showed the same level of sensitivity to external stimuli as before deformation by more than 95%.

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“…[1][2][3][4][5][6] As a typical operation in daily life, "tapping" signals from organs (i.e., heartbeat) and body action have attracted considerable interest because of their potential applications in cardiovascular disease prediction, intelligent mechanical input, and Internet of Things, etc. [7][8][9][10] Existing sophisticated and flexible pressure sensor enables perceived transduction from physiological and mechanical "tapping" signals to electrical signals, which can be classified as piezoresistive, capacitive, triboelectric, and piezoelectric according to the working mechanism. [11][12][13][14][15][16] Among these varied types of devices, capacitive pressure sensors are an attractive option due to their comprehensive superiorities such as facile fabrication, low power consumption, temperature independence, and rapid response to static/dynamic stimulation.…”

Section: Introductionmentioning

confidence: 99%

Template‐free Formation of Hybrid Dielectric for Flexible Capacitive Sensors with Wide‐Pressure‐Range Linear Detection

Lei,

Ji,

Ding

et al. 2023

Adv Materials Technologies

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Wearable and flexible capacitive pressure sensors have recently attracted significant attention in the fields of healthcare monitoring and intelligent human‐machine interaction. While considerable progress is made in achieving high‐pressure resolution over a wide linearity range, practical implementation still faces significant challenges due to complex manufacturing processes, as well as limited accuracy and stability for information transmission. To address these issues, inspiration is drawn from human skin and develop a new hybrid dielectric comprising a low‐permittivity (low‐k) micro‐cilia array and a high‐permittivity (high‐k) foam. Without assistance from an elaborate fabrication methodology, the template‐free method provides a cost‐effective and convenient way to realize the functional dielectric for flexible capacitive sensors. The hybrid dielectric exhibits a pressure‐induced series‐parallel conversion mechanism, enabling effective manipulation of the linear effective dielectric constant and controlled initial/resultant capacitance. Through systematic optimization, the sensor demonstrates a high sensitivity of 0.236 kPa−1 within an ultrabroad linearity range of up to 1100 kPa. Thanks to the unique characteristics of the hybrid dielectric, this device showcases potential applications in various domains including human joint motion analysis, healthcare monitoring, accurate message transmission, and convenient Morse code communication utilizing non‐overlapping capacitance signals.

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Porous dielectric materials based wearable capacitance pressure sensors for vital signs monitoring: A review

Cited by 18 publications

References 161 publications

A review of hydraulic energy harvester designs – current practice and future improvements

A review of hydraulic energy harvester designs – current practice and future improvements

Dynamic Covalent Bond Network-Based Carbon Nanocomposite for a Self-Healing Tactile Sensor

Template‐free Formation of Hybrid Dielectric for Flexible Capacitive Sensors with Wide‐Pressure‐Range Linear Detection

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