A semi-permanent and durable nanoscale-crack-based sensor by on-demand healing

Park, Byeonghak; Lee, Sori; Choi, Hong‐Keun; Kim, Jong Uk; Hong, Haeleen; Jeong, Chanseok; Kang, Daeshik; Kim, Tae Il

doi:10.1039/c7nr07696g

Cited by 60 publications

(50 citation statements)

References 36 publications

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“…Despite the ultrahigh sensitivity, an issue with the nanoscale crack sensor is that it is not very durable under repetitive deformations. To overcome this limitation, self‐healable polymers can be applied to the cracked layer . The self‐healable polymer integrated on the crack sensor can recover gaps between nanoscale cracks by self‐healing, thereby providing robust durability.…”

Section: Biosystem‐inspired Smart Skinsmentioning

confidence: 99%

Mimicking Human and Biological Skins for Multifunctional Skin Electronics

Lee

Park

Choe

et al. 2019

Adv Funct Materials

313

223

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Electronic skin (e-skin) technology is an exciting frontier to drive the next generation of wearable electronics owing to its high level of wearability, enabling high accuracy to harvest information of users and their surroundings. Recently, biomimicry of human and biological skins has become a great inspiration for realizing novel wearable electronic systems with exceptional multifunctionality as well as advanced sensory functions. This review covers and highlights bioinspired e-skins mimicking perceptive features of human and biological skins. In particular, five main components in tactile sensation processes of human skin are individually discussed with recent advances of e-skins that mimic the unique sensing mechanisms of human skin. In addition, diverse functionalities in user-interactive, skinattachable, and ultrasensitive e-skins are introduced with the inspiration from unique architectures and functionalities, such as visual expression of stimuli, reversible adhesion, easy deformability, and camouflage, in biological skins of natural creatures. Furthermore, emerging wearable sensor systems using bioinspired e-skins for body motion tracking, healthcare monitoring, and prosthesis are described. Finally, several challenges that should be considered for the realization of next-generation skin electronics are discussed with recent outcomes for addressing these challenges.

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Section: Biosystem‐inspired Smart Skinsmentioning

confidence: 99%

Mimicking Human and Biological Skins for Multifunctional Skin Electronics

Lee

Park

Choe

et al. 2019

Adv Funct Materials

313

223

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“…The cracks show zipper‐like behavior against even 2% strain or less, and allow high signal‐to‐noise ratio and exceptional sensitivity, a 13 000 gauge factor at 2% strain. More details are shown in prepublished papers . To apply a strain‐visualizing function to the nanoscale crack‐based sensor, the thermochromic membrane that has thermoresponsive, colorimetric function is integrated.…”

Section: Resultsmentioning

confidence: 99%

“…Figure b represents the mechanism of the strain‐visualization. As presented in resistive sensors, the nanoscale crack‐based sensor could continuously measure resistance variation by mechanical stimulus, such as strain. The resistance would increase dramatically, leading to the joule heating behavior by the mechanism of the working principle in the nanoscale crack‐based sensor.…”

Section: Resultsmentioning

confidence: 99%

Strain‐Visualization with Ultrasensitive Nanoscale Crack‐Based Sensor Assembled with Hierarchical Thermochromic Membrane

Park

Kim

et al. 2019

Adv Funct Materials

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As eidetic signal recognition has become important, displaying mechanical signals visually has imposed huge demands for simple readability and without complex signal processing. Such visualization of mechanical signals is used in delicate urgent medical or safety-related industries. Accordingly, chromic materials are considered to facilitate visualization with multiple colors and simple process. However, the response and recovery time is very long, such that rapid regular signals are unable to be detected, i.e., physiological signals, such as respiration. Here, the simple visualization of low strain ≈2%, with ultrasensitive crack-based strain sensors with a hierarchical thermochromic layer is suggested. The sensor shows a gradient color change from red to white color in each strain, which is attributed to the hierarchical property, and the thermal response (recovery) time is dramatically minimized within 0.6 s from 45 to 37 °C, as the hierarchical membrane is inspired by termite mounds for efficient thermal management. The fast recovery property can be taken advantage of in medical fields, such as monitoring regular respiration, and the color changes can be delicately monitored with high accuracy by software on a mobile phone.

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“…When a crack penetrates into the substrate, sensitivity increases by deepening the crack depth [16]. However, repetitive straining accumulates residual stress on the crack vertex, disturbing closing of the crack gap, causing the gauge factor to decrease [37]. Third, the crack sensor on PI substrate with the encapsulating layer had lower sensitivity than that of the crack sensor on PI substrate without encapsulation, but sensitivity drop with repeated tensile load improved slightly.…”

Section: Appl Sci 2018 8 Xmentioning

confidence: 98%

Polyimide Encapsulation of Spider-Inspired Crack-Based Sensors for Durability Improvement

Kim

Lee

et al. 2018

Applied Sciences

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Abstract:In mechanical sensory systems, encapsulation is one of the crucial issues to take care of when it comes to protection of the systems from external damage. Recently, a new type of a mechanical strain sensor inspired by spider's slit organ has been reported, which has incredibly high sensitivity, flexibility, wearability, and multifunctional sensing abilities. In spite of many of these advantages, the sensor is still vulnerable in harsh environments of liquids and/or high temperature, because it has heat-vulnerable polyethylene terephthalate (PET) substrate without any encapsulation layer. Here, we present a mechanical crack-based strain sensor with heat, water and saline solution resistance by alternating the substrate from polyester film to polyimide film and encapsulating the sensor with polyimide. We have demonstrated the ability of the encapsulated crack-based sensor against heat, water, saline solution damage through experiments. Our sensor exhibited reproducibility and durability with high sensitivity to strain (gauge factor above 10,000 at strain of two percent). These results show a new potential of the crack-based sensory system to be used as a wearable voice/motion/pulse sensing device and a high-temperature strain sensor.

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A semi-permanent and durable nanoscale-crack-based sensor by on-demand healing

Cited by 60 publications

References 36 publications

Mimicking Human and Biological Skins for Multifunctional Skin Electronics

Mimicking Human and Biological Skins for Multifunctional Skin Electronics

Strain‐Visualization with Ultrasensitive Nanoscale Crack‐Based Sensor Assembled with Hierarchical Thermochromic Membrane

Polyimide Encapsulation of Spider-Inspired Crack-Based Sensors for Durability Improvement

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