Feasibility of patterned vertical CNT for dry electrode sensing of physiological parameters

Abu-Saude, Mohammad; Consul-Pacareu, Sergi; Morshed, Bashir I.

doi:10.1109/biowireless.2015.7152124

Cited by 10 publications

(9 citation statements)

References 15 publications

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“…In our previous work we have fabricated many of pvCNT electrodes for dry impedimetric sensing [10,11]. The CNTs were grown in squared pillar patterns with a sufficient height to penetrate through the pores and the ridges of the Stratum Corneum of epidermis.…”

Section: Pvcnt Fapricationmentioning

confidence: 99%

“…The low impedance electrode has the potential to reduce the noise during recording the physiological and neurological signals. We have previously shown that pvCNT have lower contact impedance than the traditional wet electrodes [10,11], however pvCNT electrodes suffered from the weakness of mechanically stable adherence to the substrate. Furthermore, even though small amount of CNT on dermis is not considered hazard, there is still risk of toxicity or skin reaction to CNT exposure.…”

Section: Introductionmentioning

confidence: 98%

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Polypyrrole (PPy) conductive polymer coating of dry patterned vertical CNT (pvCNT) electrode to improve mechanical stability

Abu-Saude

Morshed

2016

2016 IEEE Topical Conference on Biomedical Wireless Technologies, Networks, and Sensing Systems (BioWireleSS)

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Traditional wet or gel electrodes are not suitable for long duration neuro-physiological monitoring. Dry electrodes for impedimetric sensing of physiological parameters (such as ECG, EEG, and GSR) promise the ability for long duration monitoring. We have previously demonstrated a novel nanotechnology based dry electrode configuration fabricated with patterned vertically-aligned carbon nanotube (pvCNT) for neuro-physiological impedimetric measurements. However, the fabricated sensors were mechanically weakly adhered to the substrate. This paper describes a coating mechanism of pvCNT with a thin layer of conductive polymer, Polypyrrole (PPy), to increase mechanical stability, while preserving superior impedance properties of pvCNT. The electrodes were fabricated on circular stainless-steel (SS) foil substrate (I I = 10 mm, and thickness = 2 mils). Electrically conductive multi-walled CNT were grown in pattered pillar formation with a square base of 100 μm each side, and an inter-pillar spacing of 200 μm. The heights of the pillars were between 1 to 1.5 mm. The coating procedure involved applying 10 μL of PPy after preparing the pvCNT with 70% ethyl alcohol solution, and flash drying at 300°C. A comparative test with commercial ECG electrodes and non-coated version show that coated pvCNT has lower electrical impedance compared to commercial electrode whereas higher impedance compared to non-coated version. The signal capture were comparable for all electrodes in vitro. The peel test reveal much stronger mechanical adhesion of the pvCNT with the SS substrate when coated with PPy. The results demonstrate the feasibility of coating pvCNT dry electrodes with PPy for robustness.

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Section: Pvcnt Fapricationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Polypyrrole (PPy) conductive polymer coating of dry patterned vertical CNT (pvCNT) electrode to improve mechanical stability

Abu-Saude

Morshed

2016

2016 IEEE Topical Conference on Biomedical Wireless Technologies, Networks, and Sensing Systems (BioWireleSS)

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“…The reported characteristics of the sensor are among the best in this field. An interesting way to create an EEG electrode is to use a patterned vertical carbon nanotube (pvCNT) [18]. Electrode made on the round discs (φ = 10 mm) made of stainless steel.…”

Section: Overview Of New Methods Ideas For the Development And Application Of Dry Electrodesmentioning

confidence: 99%

Review Dry and Non-contact EEG Electrodes for 2010-2021 years

Rakhmatulin

Gan²

2021

SSRN Journal

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The basis of the work of electroencephalography (EEG) is the registration of electrical impulses from the brain or some of its individual areas using a special sensor/electrode. This method is used for the treatment and diagnosis of various diseases. The use of wet electrodes in this case does not seem viable, for several well-known reasons. As a result of this, a detailed analysis of modern EEG sensors developed over the past few years is carried out, which will allow researchers to choose this type of sensor more carefully and, as a result, conduct their research more competently. Due to the absence of any standards in the production and testing of dry EEG sensors, the main moment of this manuscript is a detailed description of the necessary steps for testing a dry electrode, which will allow researchers to maximize the potential of the sensor in the various type of research.

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“…We have shown in previous work that the prototyped electrodes are developed such that the CNTs are grown in an aligned vertical pattern resulting in a bristle-like structure [41,42]. The pillar heights (~1.5 mm) are sufficient to measure the signal through hairy and rough areas of the skin.…”

Section: Pvcnt Fabricationmentioning

confidence: 99%

“…We have developed a dry electrode using pvCNT that has lower contact impedance than conventional wet electrodes [41][42][43]. This electrode is suitable for physiological and neurological signal acquisition with reduced noise.…”

Section: Introductionmentioning

confidence: 99%

Characterization of a Novel Polypyrrole (PPy) Conductive Polymer Coated Patterned Vertical CNT (pvCNT) Dry ECG Electrode

Abu-Saude

Morshed

2018

Chemosensors

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Conventional electrode-based technologies, such as the electrocardiogram (ECG), capture physiological signals using an electrolyte solution or gel that evaporates shortly after exposure, resulting in a decrease in the quality of the signal. Previously, we reported a novel dry impedimetric electrode using patterned vertically-aligned Carbon NanoTubes (pvCNT) for biopotential measurement applications. The mechanical adhesion strength of the pvCNT electrode to the substrate was weak, hence, we have improved this electrode using a thin coating of the conductive polymer polypyrrole (PPy) that strengthens its mechanical properties. Multiwall CNTs were grown vertically on a circular stainless-steel disc (⌀ = 10 mm) substrate of 50 µm thickness forming patterned pillars on a square base (100 µm × 100 µm) with an inter-pillar spacing of 200 µm and height up to 1.5 mm. The PPy coating procedure involves applying 10 µL of PPy mixed with 70% ethyl alcohol solution and rapid drying at 300 °C using a hot air gun at a distance of 10 cm. A comparative study demonstrated that the coated pvCNT had higher impedance compared to a non-coated pvCNT but lower impedance compared to the standard gel electrode. The PPy-coated pvCNT had comparable signal capture quality but stronger mechanical adhesion to the substrate.

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Feasibility of patterned vertical CNT for dry electrode sensing of physiological parameters

Cited by 10 publications

References 15 publications

Polypyrrole (PPy) conductive polymer coating of dry patterned vertical CNT (pvCNT) electrode to improve mechanical stability

Polypyrrole (PPy) conductive polymer coating of dry patterned vertical CNT (pvCNT) electrode to improve mechanical stability

Review Dry and Non-contact EEG Electrodes for 2010-2021 years

Characterization of a Novel Polypyrrole (PPy) Conductive Polymer Coated Patterned Vertical CNT (pvCNT) Dry ECG Electrode

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