Moldable and transferrable conductive nanocomposites for epidermal electronics

Namkoong, Myeong; Guo, Heng; Rahman, Md Saifur; Wang, Daniel; Pfeil, Cassandra Jane; Hager, Sophia; Tian, Limei

doi:10.1038/s41528-022-00170-y

Cited by 22 publications

(22 citation statements)

References 42 publications

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“…The mechanical properties of the PEDOT:PSS were tuned with additives, Triton X and D‐sorbitol, to achieve comparable modulus with skin. [ 29 ] The viscoelastic properties of the PEDOT:PSS in the nanocomposite allows the conformal contact of electrodes to the skin and to the rigid conductive surface (Figure S3, Supporting Information). The middle AgNW layer improves the conductivity and electromechanical stability of the nanocomposite.…”

Section: Resultsmentioning

confidence: 99%

Add‐On Soft Electronic Interfaces for Continuous Cuffless Blood Pressure Monitoring

Namkoong,

Baskar,

Singh

et al. 2023

Adv Materials Technologies

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Continuous monitoring of arterial blood pressure is clinically important for diagnosing and managing cardiovascular diseases. Soft electronic devices with skin‐like properties show promise in various applications, including the human‐machine interface, the Internet of Things, and health monitoring. Herein, the use of add‐on soft electronic interfaces addresses the connection challenges between soft electrodes and rigid data acquisition circuitry for bioimpedance monitoring of cardiac signals, including heart rate and cuffless blood pressure is reported. Nanocomposite films in add‐on electrodes provide robust electrical and mechanical contact with the skin and the rigid circuitry. Bioimpedance sensors composed of add‐on electrodes offer continuous blood pressure monitoring with high accuracy. Specifically, the bioimpedance collected with add‐on nanocomposite electrodes shows a signal‐to‐noise ratio of 37.0 dB, higher than the ratio of 25.9 dB obtained with standard silver/silver chloride (Ag/AgCl) gel electrodes. Although the sample set is low, the continuously measured systolic and diastolic blood pressure offer accuracy of −2.0 ± 6.3 mmHg and −4.3 ± 3.9 mmHg, respectively, confirming the grade A performance based on the IEEE standard. These results show promise in bioimpedance measurements with add‐on soft electrodes for cuffless blood pressure monitoring.

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Section: Resultsmentioning

confidence: 99%

Add‐On Soft Electronic Interfaces for Continuous Cuffless Blood Pressure Monitoring

Namkoong,

Baskar,

Singh

et al. 2023

Adv Materials Technologies

Self Cite

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show abstract

“…Compared to homogeneous inks such as polymers ( 31 ) and liquid metal ( 35 ), AgNW ink is heterogeneous with AgNWs and solvent in the ink, which is more challenging to print using micromolding-based approaches. Compared to other molding approaches ( 48 , 49 ), the reported printing approach does not use polymer additives to adjust the ink viscosity, which increases the electrical conductivity and avoids complicated postprocessing. The approach can be used not only for metal NWs but also for other nanomaterials such as metal NPs, carbon nanotubes, and 2D materials.…”

Section: Discussionmentioning

confidence: 99%

Curvilinear soft electronics by micromolding of metal nanowires in capillaries

et al. 2022

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Soft electronics using metal nanowires have attracted notable attention attributed to their high electrical conductivity and mechanical flexibility. However, high-resolution complex patterning of metal nanowires on curvilinear substrates remains a challenge. Here, a micromolding-based method is reported for scalable printing of metal nanowires, which enables complex and highly conductive patterns on soft curvilinear and uneven substrates with high resolution and uniformity. Printing resolution of 20 μm and conductivity of the printed patterns of ~6.3 × 10 6 S/m are achieved. Printing of grid structures with uniform thickness for transparent conductive electrodes (TCEs) and direct printing of pressure sensors on curved surfaces such as glove and contact lens are also realized. The printed hybrid soft TCEs and smart contact lens show promising applications in optoelectronic devices and personal health monitoring, respectively. This printing method can be extended to other nanomaterials for large-scale printing of high-performance soft electronics.

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“…As a result, the quantity of glucose in sweat may be used to determine a person’s health. A sensor that does not adapt to the skin and does not have adequate mechanical stability would deform due to the skin’s mobility, making it impossible to reliably monitor pH and glucose levels in sweat [ 488 ]. As key markers of biological processes in the human body, the movement of metabolites and nutrients in biofluids may be utilized to predict outcomes, diagnose disease, and evaluate clinical risk and track treatment progress.…”

Section: Detection Of Analytes From Sweat Using Graphenementioning

confidence: 99%

Graphene and Its Derivatives: Synthesis and Application in the Electrochemical Detection of Analytes in Sweat

et al. 2022

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Wearable sensors and invasive devices have been studied extensively in recent years as the demand for real-time human healthcare applications and seamless human–machine interaction has risen exponentially. An explosion in sensor research throughout the globe has been ignited by the unique features such as thermal, electrical, and mechanical properties of graphene. This includes wearable sensors and implants, which can detect a wide range of data, including body temperature, pulse oxygenation, blood pressure, glucose, and the other analytes present in sweat. Graphene-based sensors for real-time human health monitoring are also being developed. This review is a comprehensive discussion about the properties of graphene, routes to its synthesis, derivatives of graphene, etc. Moreover, the basic features of a biosensor along with the chemistry of sweat are also discussed in detail. The review mainly focusses on the graphene and its derivative-based wearable sensors for the detection of analytes in sweat. Graphene-based sensors for health monitoring will be examined and explained in this study as an overview of the most current innovations in sensor designs, sensing processes, technological advancements, sensor system components, and potential hurdles. The future holds great opportunities for the development of efficient and advanced graphene-based sensors for the detection of analytes in sweat.

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Moldable and transferrable conductive nanocomposites for epidermal electronics

Cited by 22 publications

References 42 publications

Add‐On Soft Electronic Interfaces for Continuous Cuffless Blood Pressure Monitoring

Add‐On Soft Electronic Interfaces for Continuous Cuffless Blood Pressure Monitoring

Curvilinear soft electronics by micromolding of metal nanowires in capillaries

Graphene and Its Derivatives: Synthesis and Application in the Electrochemical Detection of Analytes in Sweat

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