Graphene foam pressure sensor based on fractal electrode with high sensitivity and wide linear range

Yu, Tingting; Zhang, Dongguang; Wu, Yali; Guo, Shizhong; Lei, F.; Li, Yang; Yang, Jiayi

doi:10.1016/j.carbon.2021.06.049

Cited by 36 publications

(14 citation statements)

References 53 publications

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“…Another approach for increasing permittivity in PDMS microstructures is the introduction of conductive nanoparticles or high- k nanofillers such as nanoparticles of carbon and its derivatives, which results in pressure sensors with higher sensitivity, faster response time, and improved stability. ,,, Recently, graphene and its various forms as conductive filler have attracted much attention for potential applications in pressure and strain sensing, due to the ultrasensitivity that can be achieved . As such, there are numerous reports on graphene based porous piezoresistive pressure sensors and sensitivity of ∼135 kPa –1 has been achieved . However, there are only few reports on capacitive pressure sensors with graphene based porous foams.…”

Section: Introductionmentioning

confidence: 99%

“…27 As such, there are numerous reports on graphene based porous piezoresistive pressure sensors and sensitivity of ∼135 kPa −1 has been achieved. 28 However, there are only few reports on capacitive pressure sensors with graphene based porous foams. A summary of capacitive pressure sensors with porous foams, including graphene based foams, is given in Table S1.…”

Section: Introductionmentioning

confidence: 99%

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Graphene Porous Foams for Capacitive Pressure Sensing

Kurup

Cole

Arthur

et al. 2022

ACS Appl. Nano Mater.

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Flexible pressure sensors are an attractive area of research due to their potential applications in biomedical sensing and wearable devices. Among flexible and wearable pressure sensors, capacitive pressure sensors show significant advantages, owing to their potential low cost, ultralow power consumption, tolerance to temperature variations, high sensitivity, and low hysteresis. In this work, we develop capacitive flexible pressure sensors using graphene based conductive foams. In these soft and porous conductive foams, graphene is present either as a coating of the pores in the foam, inside the structure of the foam, or as a combination of both. We demonstrate that they are durable and sensitive at low pressure ranges (<10 kPa). Systematic analysis of the different pressure sensors revealed that the porous foams with graphene coated pores are the most sensitive (∼0.137 kPa–1) in the pressure range 0–6 kPa, with a limit of detection of 50 Pa. Further, we demonstrated the potential applications of our pressure sensors by showing detection of weak physiological signals of the body. Our work is highly relevant for research in flexible pressure sensors based on conductive foams as it shows the impact of different ways of incorporating conductive material on performance of pressure sensors.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Graphene Porous Foams for Capacitive Pressure Sensing

Kurup

Cole

Arthur

et al. 2022

ACS Appl. Nano Mater.

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“… 38 Additionally, the shape of the electrode and the sponge surface in contact can also have an influence on the sensitivity of the sensor. 39 The sensitivity of the sensor is adjusted by adjusting the contact resistance through the effective area with the sensitive unit.…”

Section: Resultsmentioning

confidence: 99%

A highly accurate flexible sensor system for human blood pressure and heart rate monitoring based on graphene/sponge

et al. 2022

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“…Examples include healthcare monitoring, [1] human-machine interfaces, [2] and electronic textiles. [3] Different sensing mechanisms exist such as piezoresistive, [4][5][6][7][8] capacitive, [9][10][11][12][13][14] piezoelectric, [15,16] and triboelectric. [17,18] Among these applications, soft capacitive sensors have been studied widely because of their high sensitivity, low energy consumption, and temperature independence.…”

Section: Introductionmentioning

confidence: 99%

Skin‐Inspired Capacitive Stress Sensor with Large Dynamic Range via Bilayer Liquid Metal Elastomers

Yang

Kwon

Kanetkar

et al. 2021

Adv Materials Technologies

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Soft devices that sense touch are important for prosthetics, soft robotics, and electronic skins. One way to sense touch is to use a capacitor consisting of a soft dielectric layer sandwiched between two electrodes. Compressing the capacitor brings the electrodes closer together and thereby increases capacitance. Ideally, sensors of touch should have both large sensitivity and the ability to measure a wide range of stress (dynamic range). Although skin has such capabilities, it remains difficult to achieve both sensitivity and dynamic range in a single manmade sensor. Inspired by skin, this work reports a soft capacitive pressure sensor based on a bilayer of liquid metal elastomer foam (B‐LMEF). The B‐LMEF consists of an elastomer slab (elastic modulus: ≈655 kPa) laminated with a soft liquid metal elastomer foam (LMEF, elastic modulus: ≈7 kPa). The LMEF deforms at small stresses (<10 kPa), and both layers deform at large stresses (>10 kPa). The B‐LMEF has high sensitivity (0.073 kPa–1) at small stress and can operate over a large range of stress (200 kPa), which leads to a large dynamic range (≈4.1 × 105). Additionally, the elastomer slab has a large energy dissipation coefficient; the skin uses this property to cushion the human body from external stress and strain.

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Graphene foam pressure sensor based on fractal electrode with high sensitivity and wide linear range

Cited by 36 publications

References 53 publications

Graphene Porous Foams for Capacitive Pressure Sensing

Graphene Porous Foams for Capacitive Pressure Sensing

A highly accurate flexible sensor system for human blood pressure and heart rate monitoring based on graphene/sponge

Skin‐Inspired Capacitive Stress Sensor with Large Dynamic Range via Bilayer Liquid Metal Elastomers

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