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Issue 9, 2019
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An integrated transparent, UV-filtering organohydrogel sensor via molecular-level ion conductive channels

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Abstract

Hydrogel-based strain sensors are promising for skin-like electronics. To satisfy the various requirements of wearable devices used for direct human contact, a hydrogel needs to possess transparent, stretchable, conductive, antifreezing and moisture-retention properties. However, preparation of hydrogels with these properties is challenging. Herein, we innovatively designed and fabricated a transparent, conductive polyvinyl alcohol-tannic acid@talc (PVA-TA@talc) organohydrogel via molecular-level ion conductive channels in ethylene glycol/H2O (EG/H2O), and this organohydrogel integrates excellent conductive, transparent, antifreezing, moisture-retention, toughness, and stretchable properties for the first time. Moreover, this organohydrogel possesses remarkable light filtering capabilities and can effectively filter ultraviolet (UV) light. Interestingly, this organohydrogel can act as a wearable dressing to protect skin from frostbite and ultraviolet radiation. Notably, based on molecular-level ion transport channels, this organohydrogel has great strain sensitivity (gauge factor ≈ 9.17, 0–1.2% strain) that enables recognition of limb movement, pulse, language, and handwriting. The organohydrogel can collect electromyography (EMG) signals as a bioelectrode and be applied to prepare a T-pen for controlling smartphones. In short, this novel organohydrogel has great application prospects for wearable electronics, and the strategy for the organohydrogel constructed via molecular-level ion conductive channels will open a new route for the preparation of multifunctional ionic organohydrogels.

Graphical abstract: An integrated transparent, UV-filtering organohydrogel sensor via molecular-level ion conductive channels

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Publication details

The article was received on 23 Dec 2018, accepted on 25 Jan 2019 and first published on 25 Jan 2019


Article type: Paper
DOI: 10.1039/C8TA12360H
Citation: J. Mater. Chem. A, 2019,7, 4525-4535

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    An integrated transparent, UV-filtering organohydrogel sensor via molecular-level ion conductive channels

    X. Pan, Q. Wang, R. Guo, Y. Ni, K. Liu, X. Ouyang, L. Chen, L. Huang, S. Cao and M. Xie, J. Mater. Chem. A, 2019, 7, 4525
    DOI: 10.1039/C8TA12360H

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