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A self-healing, robust adhesion, multiple stimuli-response hydrogel for flexible sensors

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Abstract

Ionic hydrogels have great application potential in human index monitoring and wound treatment, such as in wearable sensors, wound dressings, and ionic skin. However, the design of a hydrogel achieving the synergistic characteristics of excellent mechanical properties, robust adhesion, and multiple stimuli-responses remains a critical challenge. Herein, by introducing negatively charged clay nanosheets, we report a smart ionic Gelatin/PAAm/Clay hydrogel (GPNs gel) with a high conductivity of 10.87 mS cm−1. The as-prepared gel exhibits excellent self-healing properties, robust adhesion (interfacial toughness of up to 485 J m−2 with pigskin), and multiple stimuli-responses driven by salt ions, pH, and stress. Based on this hydrogel, a capacitive sensor has also been designed, which provides linear responses over a wide range (applied pressure up to 2 kPa) and sensitively monitors human motion. In addition, the gel also displays good biocompatibility with human lung embryonic (MRC-5) cells. These characteristics demonstrate that the GPNs gel is an ideal candidate for developing flexible sensor devices.

Graphical abstract: A self-healing, robust adhesion, multiple stimuli-response hydrogel for flexible sensors

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Article information


Submitted
22 Nov 2019
Accepted
20 Jan 2020
First published
21 Jan 2020

Soft Matter, 2020, Advance Article
Article type
Paper

A self-healing, robust adhesion, multiple stimuli-response hydrogel for flexible sensors

Y. Zhu, L. Lin, Y. Chen, Y. Song, W. Lu and Y. Guo, Soft Matter, 2020, Advance Article , DOI: 10.1039/C9SM02303H

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