Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 50, Pages 47358-47364Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b16675
Keywords
self-healing; hydrogel; liquid metal; transient electronics; epidermal sensors
Funding
- National Natural Science Foundation of China [21774012, 51973008, 21404006]
- Beijing Natural Science Foundation [2152023]
- National Key Research and Development Project [2016YFC0801302]
- Fundamental Research Funds for the Central Universities
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Wearable epidermal sensors are attracting growing interests in human activity monitoring and flexible touch display, but they are still limited by the poor self-healing property and the difficult dissolvable feature. Herein, we report polyvinyl alcohol (PVA)-stabilized liquid metal particles (LMPs) (PVA-LMPs) hydrogels with excellent self-healing performance and the dissolvable feature for wearable epidermal sensors, constructed by dispersing LMPs of eutectic gallium and indium into the borate-modified PVA polymer networks. Interestingly, the PVA-LMPs hydrogels exhibited excellent electrically and mechanically self-healing ability. Moreover, the PVA-LMPs hydrogel can be fabricated as epidermal sensors, which can accurately monitor the human activities. Additionally, the epidermal sensors are dissolvable, showing an attractive feature for on demand transient electronics. It is demonstrated that the hydroxyl groups of PVA can stabilize LMPs via hydrogen-bonding interactions. Furthermore, the dynamic cross-linking bonds between hydrogels and LMPs can rupture and coalesce reversibly in the hydrogel network, which endow the hydrogels with both electrically and mechanically self-healing ability. This work shows the potential of constructing next-generation multifunctional hydrogel-based epidermal sensors for human activity monitoring, wearable healthcare diagnosis, portable electronics, and robot tactile systems.
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