Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.contributor | School of Fashion and Textiles | en_US |
| dc.contributor.advisor | Zheng, Zijian (SFT) | en_US |
| dc.creator | Chen, Fan | - |
| dc.identifier.uri | https://theses.lib.polyu.edu.hk/handle/200/14518 | - |
| dc.language | English | en_US |
| dc.publisher | Hong Kong Polytechnic University | en_US |
| dc.rights | All rights reserved | en_US |
| dc.title | Adhesive, permeable, and wearable electronic skin | en_US |
| dcterms.abstract | Skin electronics provides remarkable opportunities for non-invasive and long-term monitoring of a wide variety of biophysical and physiological signals that are closely related to health, medicine, and human-machine interactions. Nevertheless, conventional skin electronics fabricated on elastic thin films are difficult to adapt to the wet microenvironments of the skin: elastic thin films are non-permeable, which blocks the skin perspiration; elastic thin films are difficult to adhere to wet skins; most skin electronics are difficult to work stably under wet conditions. In this thesis, these issues are solved by developing state-of-the-art adhesive, permeable and wearable electronic skins. | en_US |
| dcterms.abstract | First, a wet-adaptive electronic skin (WADE-skin) has been investigated, which consists of a next-to-skin wet-adhesive fibrous layer, a next-to-air waterproof fibrous layer, and a stretchable and permeable liquid metal electrode layer. While the electronic functionality is determined by the electrode design, this WADE-skin simultaneously offers superb stretchability, wet adhesion, permeability, biocompatibility, and waterproof property. The WADE-skin can rapidly adhere to human skin after contact for a few seconds and stably maintain the adhesion over weeks even under wet conditions, without showing any negative effect to the skin health. This study demonstrates the use of WADE-skin for the stable recording of electrocardiogram during intensive sweating as well as underwater activities, and as the strain sensor for the underwater operation of virtual reality-mediated human-machine interactions. | en_US |
| dcterms.abstract | Second, a strategy called "nanofibers-to-hydrogel" has been proposed to improve the conformability and reduce the skin impedance for the liquid-metal epidermal electrodes. The liquid-metal PVA fiber mats that are fabricated by electrospinning are easily handled and use-friendly. The hydrophilic PVA fiber mats possess the ability to rapidly absorb saline water, enabling the on-demand production of ultrathin hydrogel tattoos. These resulting hydrogel tattoos are stretchable, permeable and could conformally adheres to the skin. Furthermore, these hydrogel tattoos display low skin impedance compared to the commercial Ag/AgCl gel electrode. The application of these hydrogel tattoos as biophysiological electrodes for detecting ECG signals for health monitoring, as well as their integration into a 6-channel EMG sensor array for gesture recognition enhanced by machine learning, are demonstrated. | en_US |
| dcterms.abstract | Finally, an all-fiber-mat, permeable, wet-adhesive, and superplastic triboelectric skin (PAST e-skin) has been proposed. The triboelectric fiber mat was fabricated by coaxial electrospinning, resulting in a notable enhancement of stretchability from 200% to 600%, and a reduction in the residue strain from 60% to 30.6% under 100% pre-stretching. The PAST e-skin pertains a wet- and skin-adhesive fiber mat that could seamlessly adheres the PAST e-skin to the wet human skin with an impressive adhesion strength of 80 kPa. The PAST e-skin simultaneously offers high stretchability, low residue strain, textile-like permeability, and wet-adhesive properties. The PAST e-skin exhibits an open-circuit voltage of 96.7 V and a short-circuit current of 4.0 μA. Furthermore, the on-skin monitoring in different body locations has been also achieved by the PAST e-skin. | en_US |
| dcterms.abstract | In conclusion, this thesis first introduced a pioneering wet-adaptive electronic skin that offers exceptional stretchability, wet adhesion, permeability, biocompatibility, and waterproof properties. Subsequently, an innovative approach, named "nanofibers-to-hydrogel" was developed to produce biophysiological electrodes with permeability, skin adhesion, and low impedance properties. Finally, a type of fibrous triboelectric e-skin was proposed, showcasing permeability, adhesiveness, and stretchability. It could envision that this thesis will bring effective and universal solutions to the development of wet-adaptive and high-performance on-skin electronics with a more comfortable and user-friendly wearing experience. | en_US |
| dcterms.extent | xxv, 162 pages : color illustrations | en_US |
| dcterms.isPartOf | PolyU Electronic Theses | en_US |
| dcterms.issued | 2024 | en_US |
| dcterms.educationalLevel | Ph.D. | en_US |
| dcterms.educationalLevel | All Doctorate | en_US |
| dcterms.accessRights | open access | en_US |
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