Biocompatible, optically transparent, patterned, and flexible electrodes and radio-frequency antennas prepared from silk protein and silver nanowire networks

Min, Kyungtaek; Umar, Muhammad; Seo, Haekyo; Yim, Ji Hye; Kam, Dong Gun; Jeon, Heonsu; Lee, Soonil; Kim, Sunghwan

doi:10.1039/c6ra25580a

Cited by 30 publications

(24 citation statements)

References 41 publications

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“…In addition, there are reports on electrodes that use highly biocompatible materials such as poly-vinyl-alcohol (PVA), [18,21] gels, [22] and silk fibroin for biocompatibility. [23,24] Biocompatibility is especially important when considering the wearing of electrodes on patients with skin diseases. Clinicians evaluate it using methods such as the patch test and histological staining procedures.…”

Section: Doi: 101002/adhm202001322mentioning

confidence: 99%

Skin Impedance Measurements with Nanomesh Electrodes for Monitoring Skin Hydration

Matsukawa

Miyamoto

Yokota

2020

Adv Healthcare Materials

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The importance of continuous monitoring of skin hydration in daily life, to aid in the diagnosis of skin diseases, is rising. Electrodes that can be worn directly on the skin are attracting attention as an effective means. However, they should not inhibit natural water evaporation from the skin and should not cause inflammation or irritation even if they are attached to the body for long periods of time. In this study, nanomesh electrodes that have previously been reported to exhibit high biocompatibility are also found to exhibit high water vapor permeability, resulting in properties that prevent skin dampness. Furthermore, the skin impedance measured using nanomesh electrodes is found to correlate with the hydration level of skin measured using existing medical equipment. This study provides a new approach to measure skin hydration in conditions close to bare skin. Skin is the outermost organ of the body and acts as a barrier separating the inside of the body from the outside world. Skin is essential to prevent the entry of pathogens and contaminants from the outside environment into the body, as well as to prevent excessive evaporation of water from the body. The stratum corneum, the outermost layer of the skin, serves as a barrier that inhibits water evaporation from the skin called trans-epidermal water loss (TEWL). [1] When the stratum corneum is damaged, the water in skin evaporates more easily to the outside world, making the skin prone to dryness. [2] Therefore, it is important to measure the skin hydration levels to assess the barrier function of the stratum corneum. The evaluation of the stratum corneum's barrier function has attracted significant attention from the cosmetic and medical fields as it is useful for understanding the characteristics of an individual's skin and diagnosing skin diseases such as atopic dermatitis, [3] ichthyosis vulgaris, [4] and psoriasis. [5] Skin hydration levels are commonly measured indirectly by measuring the skin's electrical properties, such as the skin impedance and skin capacitance. This is because the higher the hydration level of the skin, the higher the conductivity and dielectric constant. [6,7] In the medical community, the electrical properties of the skin are measured using probes with rigid electrodes

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Section: Doi: 101002/adhm202001322mentioning

confidence: 99%

Skin Impedance Measurements with Nanomesh Electrodes for Monitoring Skin Hydration

Matsukawa

Miyamoto

Yokota

2020

Adv Healthcare Materials

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“…40 Min et al demonstrated that patterned Ag NW on a SF substrate acts as a transparent resistor and a radiofrequency antenna for food sensors. 41 Qi et al reported that Ag NW and SF composite lms have excellent transmittance and conductivity and can be used as exible interconnectors. Although several applications of Ag NW-SF compositions or Ag NW-coated SF substrates, such as bacteria sensors, photonics, electronic devices, food sensors, actuators, therapeutics, and energy harvesting devices have been suggested, their use as electrodes for wearable transparent and exible heaters (TFHs) has not yet been reported.…”

Section: Introductionmentioning

confidence: 99%

Highly transparent and flexible Ag nanowire-embedded silk fibroin electrodes for biocompatible flexible and transparent heater

et al. 2020

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“…Until now, many approaches used to prepare silver nanowires networks have been presented including vacuum filtration, the drop-cast method, Meyer rod coating, and the transfer-printing technique [ 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 ]. However, it is very difficult to achieve a high quality film with low sheet resistance, high optical transmittance, and good adhesion between the nanowires and substrate surface at the same time.…”

Section: Introductionmentioning

confidence: 99%

Flexible Transparent Conductive Film Based on Random Networks of Silver Nanowires

Xie

Yang

et al. 2018

Micromachines

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We synthesized silver nanowires (AgNWs) with a mean diameter of about 120 nm and 20–70 μm in length using a polyol process. The flexible transparent conductive AgNWs films were prepared using the vacuum filtration-transferring process, in which random AgNWs networks were transferred to a polyethylene terephthalate (PET) substrate after being deposited on mixed cellulose esters (MCEs). Furthermore, the photoelectric and mechanical properties of the AgNWs films were studied. The scanning electron microscopy images show that the AgNWs randomly, uniformly distribute on the surface of the PET substrate, which indicates that the AgNWs structure was preserved well after the transfer process. The film with 81% transmittance at 550 nm and sheet resistance about 130 Ω·sq−1 can be obtained. It is sufficient to be used as a flexible transparent conductive film. However, the results of the bending test and tape test show that the adhesion of AgNWs and PET substrate is poor, because the sheet resistance of film increases during the bending test and tape test. The 0.06 W LED lamp with a series fixed on the surface of the AgNWs-PET electrode with conductive adhesive was luminous, and it was still luminous after bent.

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Biocompatible, optically transparent, patterned, and flexible electrodes and radio-frequency antennas prepared from silk protein and silver nanowire networks

Abstract: We demonstrated biocompatible, optically transparent and flexible electrodes by embedding AgNWs just below the surface of the silk fibroin film.

Cited by 30 publications

References 41 publications

Skin Impedance Measurements with Nanomesh Electrodes for Monitoring Skin Hydration

Skin Impedance Measurements with Nanomesh Electrodes for Monitoring Skin Hydration

Highly transparent and flexible Ag nanowire-embedded silk fibroin electrodes for biocompatible flexible and transparent heater

Flexible Transparent Conductive Film Based on Random Networks of Silver Nanowires

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