Flexible Thin‐Film Electrodes on Porous Polyester Membranes for Wearable Sensors

Gangopadhyay, Aveek; Nablo, Brian J.; Rao, Mulpuri V.; Reyes, Darwin R.

doi:10.1002/adem.201600592

Cited by 12 publications

(13 citation statements)

References 23 publications

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“…(e) Highly stretchable hydrogel-ecoflex bilayer can be elongated up to 1780% of strain [46]. [53,82,84,99,114,115], polyethylene terephthalate (PET) [41,98,[116][117][118][119][120], polyethylene naphthalate (PEN) [92,121], and polymethyl methacrylate (PMMA) [29,122].…”

Section: Mechanically Flexible Supportsmentioning

confidence: 99%

“…In both cases, the process, the roughness of the sample surface, the angle between the sample and the source affect the quality of the deposition The low working pressure condition (down to 10 −4 Pa) prevents gaseous contamination and a high deposition rate (up to 1 µm min −1 ) can be achieved. Both thermal and e-beam evaporation are mainly employed for metals such as Cr [55,68,105,134,136,223,241], Au [55,68,105,108,116,117,134,136,223,228,241], Ti [68,108,128,133,228,241], Mg [105,125], Mo [187], Cu [128,133,188] and Al [112,137]. Also semiconductors [86,136,188,191,204,227] and dielectrics [140,231] can be evaporated.…”

Section: Vacuum Based Thin-film Technologymentioning

confidence: 99%

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Thin-film electronics on active substrates: review of materials, technologies and applications

Catania

Oliveira

Lugoda

et al. 2022

J. Phys. D: Appl. Phys.

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In the last years, the development of new materials as well as advanced fabrication techniques have enabled the transformation of electronics from bulky rigid structures into unobtrusive soft systems. This gave rise to new thin-film devices realized on previously incompatible and unconventional substrates, such as temperature-sensitive polymers, rough organic materials or fabrics. Consequently, it is now possible to realize thin-film structures on active substrates which provide additional functionality. Examples include stiffness gradients to match mechanical properties, mechanical actuation to realize smart grippers and soft robots, or microfluidic channels for lab-on-chip applications. Composite or microstructured substrates can be designed to have bespoke electrical, mechanical, biological and chemical features making the substrate an active part of a system. Here, the latest developments of smart structures carrying thin-film electronics are reviewed. Whereby the focus lies on soft and flexible systems, designed to fulfill tasks, not achievable by electronics or the substrate alone. After a brief introduction and definition of the requirements and topic areas, the materials for substrates and thin-film devices are covered with an emphasis on their intrinsic properties. Next, the technologies for electronics and substrates fabrication are summarized. Then, the desired properties and design strategies of various active substrate are discussed and benchmarked against the current state-of-the-art. Finally, available demonstrations, and use cases are presented. The review concludes by mapping the available technologies to innovative applications, identifying promising underdeveloped fields of research and potential future progress.

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Section: Mechanically Flexible Supportsmentioning

confidence: 99%

Section: Vacuum Based Thin-film Technologymentioning

confidence: 99%

Thin-film electronics on active substrates: review of materials, technologies and applications

Catania

Oliveira

Lugoda

et al. 2022

J. Phys. D: Appl. Phys.

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“…Recent various methods have been developed and introduced to fabricate breathable substrates for on-skin electronics. Generally, these methods can be divided into two categories: direct preparation of porous materials and engineering porous materials. , The porous materials with inherently porous structure are mainly based on paper and fabrics, which can be obtained by typical weaving, knitting, , electrospinning, , vacuum filtration, etc. Despite that this type of porous material exhibits excellent breathability to air and moisture, the rough surface of the common paper and fabric makes them incompatible with current lithography processes and printed electronics.…”

Section: Introductionmentioning

confidence: 99%

“…Generally, these methods can be divided into two categories: direct preparation of porous materials and engineering porous materials. 5,14 The porous materials with inherently porous structure are mainly based on paper and fabrics, which can be obtained by typical weaving, 15 knitting, 16,17 electrospinning, 18,19 vacuum filtration, 20 breathability to air and moisture, the rough surface of the common paper and fabric makes them incompatible with current lithography processes and printed electronics. Moreover, the effective strategy to endow the flexible materials with breathability is to engineer porous materials, such as kirigami design 21 and templating techniques.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Breathable Multifunctional On-Skin Electronics Based on Tunable Track-Etched Membranes

Zhao,

Wang,

et al. 2024

ACS Appl. Electron. Mater.

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The on-skin electronics have been extensively studied in various applications such as human−machine interfaces, intelligent prostheses, and health monitoring. However, the current research on flexible electronics tends to focus largely on improving flexibility, functionality, and stability while overlooking the physiological comfort. Therefore, it is necessary to develop a flexible, permeable material and structure to improve long-term wearing comfort for on-skin electronics. Here, the fabrication of breathable multifunctional on-skin electronics based on highly flexible and tunable track-etched membranes is reported. The tracketched membranes are fabricated by a state-of-the-art ion bombardment strategy and feature a smooth surface and unique pore structure regarding precisely tunable pore size and pore density, which offer simultaneously controllable permeability, high functionality, and durability. The track-etched membrane with a pore size of 12.63 μm exhibits an ultrahigh air permeability (190.6 mm s −1 ) and moisture permeability (2051 g m −2 day −1 ). Finally, highly flexible and breathable pressure sensors and bioelectric electrodes based on track-etched membranes with advanced thermoregulation are proposed for continuous monitoring of motion and physiological signals.

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“…Figure 13 shows the schematic diagram of some of the wearable flexible sensors developed from different substrates, which are used for POC diagnostics [178]. These materials possess greater applications in wearable and implantable devices [179]. …”

Section: Sensor Network For Wearable Flexible Sensorsmentioning

confidence: 99%

Wearable Flexible Sensors: A Review

2017

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Abstract-The paper provides a review on some of the significant research work done on wearable flexible sensors (WFS). Sensors fabricated with flexible materials have been attached to a person along with the embedded system to monitor a parameter and transfer the significant data to the monitoring unit for further analyses. The use of wearable sensors has played a quite important role to monitor physiological parameters of a person to minimize any malfunctioning happening in the body. The paper categorizes the work according to the materials used for designing the system, the network protocols and different types of activities that were being monitored. The challenges faced by the current sensing systems and future opportunities for the wearable flexible sensors regarding its market values are also briefly explained in the paper.

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Flexible Thin‐Film Electrodes on Porous Polyester Membranes for Wearable Sensors

Cited by 12 publications

References 23 publications

Thin-film electronics on active substrates: review of materials, technologies and applications

Thin-film electronics on active substrates: review of materials, technologies and applications

Fabrication of Breathable Multifunctional On-Skin Electronics Based on Tunable Track-Etched Membranes

Wearable Flexible Sensors: A Review

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