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A hybrid polyvinyl alcohol/molybdenum disulfide nanosheet hydrogel with light-triggered rapid self-healing capability
Wen Jing Yang1, Xiaodong Wang1, Rui Zhang1
1Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors, Institute of Advanced Materials (IAM), Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts and Telecommunications, Nanjing, 210023, China. iamlhwang@njupt.edu.cn iamlhyuwen@njupt.edu.cn.
Abstract:
A hybrid self-healing hydrogel (PM hydrogel), based on polyvinyl alcohol (PVA) and chemically exfoliated molybdenum disulfide (ce-MoS2) nanosheets, was prepared by a simple freeze-thaw method. Due to the excellent photothermal conversion properties of ce-MoS2 nanosheets, the PM hydrogel self-repaired rapidly under near infrared (NIR) light irradiation for only 3 min with a high healing efficiency of 91.8 ± 3.3%. The PVA content, ce-MoS2 nanosheet loading and light irradiation time played important roles in the self-healing performance. Additionally, the PM hydrogel also revealed good self-healing properties with a healing efficiency of 60.6 ± 3.6% after the cut surfaces were separated for 24 h. The present approach provides an effective strategy for fabricating fast light-triggered hydrogen-bond based self-healing systems. The as-prepared hybrid PM hydrogel has great potential as a soft biomaterial for long-term applications due to its biocompatibility and self-healing capability.
