Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 19, Pages 22225-22236Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c06091
Keywords
antimicrobial; rehealing hydrogel; mechanical toughness; self-adhesive; strain sensor
Funding
- Aeronautical Science Foundation of China [2018ZF53065]
- National Natural Science Foundation of China [51373137, 21905228, 31900950]
- Fundamental Research Funds for the Central Universities [3102018zy047]
- Natural Science Basic Research Plan in Shaanxi Province of China [2017JQ2002]
- Shanghai Space Science and Technology Innovation Fund
- Innovative Training Program for College Students in Shaanxi Province [s201910699329]
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Owing to the characteristics of mimicking human skin's function and transmitting sensory signals, electronic skin (eskin), as an emerging and exciting research field, has inspired tremendous efforts in the biomedical field. However, it is frustrating that most e-skins are prone to bacterial infections, resulting a serious threat to human health. Therefore, the construction of e-skin with an integrated perceptual signal and antibacterial properties is highly desirable. Herein, the dynamic supramolecular hydrogel was prepared through a freezing/thawing method by cross-linking the conductive graphene (G), biocompatible polyvinyl alcohol (PVA), self-adhesive polydopamine (PDA), and in situ formation antibacterial silver nanopartides (AgNPs). Having fabricated the hierarchical network structure, the PVA-G-PDA-AgNPs composite hydrogel with a tensile strength of 1.174 MPa and an elongation of 331% paves way for flexible e-skins. Notably, the PVA-G-PDA-AgNPs hydrogel exhibits outstanding antibacterial activity to typical pathogenic microbes (e.g., Gram-negative Escherichia coli and Gram-positive Staphylococcus aureus), which effectively prevents bacterial infections that harm human health. With self-adhesiveness to various surfaces and excellent conductivity, the PVA-G-PDA-AgNPs composite hydrogel was used as strain sensors to detect a variety of macroscale and microscale human motions successfully. Meanwhile, the excellent rehealing property allows the hydrogel to recycle as a new sensor to detect large-scale human activities or tiny movement. Based on these remarkable features, the antibacterial, self-adhesive, recyclable, and tough conductive composite hydrogels possess the great promising application in biomedical materials.
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