Fabricated wearable and flexible chip composed strain of gallium and silver metals composites assembled on graphene inside PDMS matrix

Abdelrahman, Ameen; Erchiqui, Fouad; Nedil, Mourad

doi:10.1016/j.jics.2022.100345

Cited by 5 publications

(6 citation statements)

References 59 publications

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“…In most graphene PDMS foam pressure sensors, graphene is embedded in the PDMS matrix. The dielectric constant values with and without graphene in PDMS at 1 kHz are reported as 3.21 and 2.69, respectively . Our recent investigation revealed that coating the pores of the PDMS foam with graphene results in higher sensitivities compared to graphene embedded in the PDMS foam .…”

Section: Introductionmentioning

confidence: 91%

“…The dielectric constant values with and without graphene in PDMS at 1 kHz are reported as 3.21 and 2.69, respectively. 30 Our recent investigation revealed that coating the pores of the PDMS foam with graphene results in higher sensitivities compared to graphene embedded in the PDMS foam. 6 The PDMS foams were fabricated using a sugar templating method, which is one of the simplest techniques.…”

Section: Introductionmentioning

confidence: 99%

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Highly Sensitive Capacitive Low-Pressure Graphene Porous Foam Sensors

Kurup

Arthur

Yambem

2022

ACS Appl. Electron. Mater.

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Flexible pressure sensors are becoming increasingly popular due to their potential applications in multifunctional wearable devices. Among flexible pressure sensors, capacitive pressure sensors based on porous foams of poly(dimethylsiloxane) (PDMS) are widely investigated. In this work, we develop highly sensitive capacitive pressure sensors operating in a low-pressure range (<10 kPa) using graphene-coated PDMS foams with different ranges of pore sizes, obtained either by sugar templating or a combination of sugar templating and emulsion templating. Our analysis reveals that pressure sensors with the highest variation in pore sizes over a wide pore size range are the most sensitive and reach a high sensitivity of ∼3.7 kPa −1 (for a range of 2−6 kPa). These pressure sensors have a low limit of detection of ∼20 Pa and are able to detect small changes in pressure in many situations, demonstrating potential applications in wearable biomedical sensors. Our result shows future pathways for developing pressure sensors with higher sensitivities and, therefore, highly relevant for research in pressure sensors based on conductive foams.

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Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Highly Sensitive Capacitive Low-Pressure Graphene Porous Foam Sensors

Kurup

Arthur

Yambem

2022

ACS Appl. Electron. Mater.

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“…[22] It has been shown that the addition of graphene to PDMS increases its dielectric constant from 2.69 to 3.21 at 1 kHz, and subsequently increased sensitivity of the pressure sensors. [23] In our previous investigations, we found that pressure sensors using PDMS foams coated with graphene are more sensitive than PDMS pressure sensors with graphene incorporated into the structure of the foam. [6] We also showed that sensitivity Scanning Electron Microscopy (SEM) images of cross-sections of PDMS foams over a larger a-e) and smaller f-j) smaller field of view.…”

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Incorporating Nanoparticles in Porous Foam Templating for Enhanced Sensitivity of Capacitive Pressure Sensors

Kurup,

Arthur,

Cole

et al. 2024

Advanced Sensor Research

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Capacitive pressure sensors based on porous foams have been demonstrated for various biomedical applications (0–10 kPa). Many different methods for fabricating porous foams have been reported. In this work, for the first time, the incorporation of silica nanoparticles are reported into the templating process of porous foams fabricated through a combination of particle and emulsion templating, in order to enhance the formation of smaller microstructures in polydimethylsiloxane foams. The foams are coated with graphene, and pressure sensors developed using these foams showed increased sensitivity, up to 4.08 kPa−1. The incorporation of nanoparticles also improves the linearity of the sensitivity, giving a linear sensitivity for the pressure sensors over a pressure range of 0–6 kPa. Further, these pressure sensors have a low limit of detection of ≈13 Pa. These results indicate that incorporation of suitable nanoparticles in the templating of foams is a promising strategy for developing foam‐based pressure sensors with high and linear sensitivity.

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“…10,11 Among various carbon materials, graphene is the most commonly used carbon nanomaterial in scientic elds owing to its large surface area, strong mechanical properties, thermal stability, and excellent conductivity. [12][13][14][15] These unique properties have made it a hot candidate material in electroanalysis applications. 16,17 In particular, graphene modied with cyclodextrin is attractive due to the synergistic effect where cyclodextrin provides supramolecular recognition properties and graphene supplies high electrical performance.…”

Section: Introductionmentioning

confidence: 99%