期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 46, 页码 51987-51998出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c15578
关键词
wearable flexible electronics; conductive films; self-healing; sensors; human motion monitoring
资金
- National Natural Science Foundation of China [21909230]
- Postdoctoral Science Foundation of Shaanxi Province [2018BSHEDZZ208]
- China Postdoctoral Science Foundation [2017M623235]
- Fundamental Research Funds for the Central Universities [3102017G2017KY0312]
- Natural Science Basic Research Plan in Shaanxi Province of China [2018JQ5021]
Recently, flexible electronics have been paid great attention due to their unique characteristics, such as high stretchability, arbitrary bending, and recoverable deformation. As a core component, flexible conductive materials with skin-like properties are desirable and valuable for the development of flexible electronics. However, the integration of skin-like mechanical properties, inherent self-healing ability, ultrahigh sensitivity, and electrical conductivity into one material is difficult to be realized. Here, this study reports a kind of conductive film (PAM-dc-fGO) fabricated by cross-linking intrinsic self-repair polyazomethine (PAM) and ethylenediamine-functionalized graphene oxide (fGO) through dynamic covalent bonds (imine bonds, -CH=N-). The as-prepared conductive films exhibit skin-like mechanical properties with a stretchability of 212-275% and elastic moduli of 0.76-4.23 MPa. In addition, the healing efficiency in mechanical properties of the 24 h healed specimen can restore up to 99%, and the healing efficiency in terms of electrical conductivity still maintains above 95% after five breaking/healing cycles, indicating an excellent capability of self-repair. Due to the ultrahigh sensing sensitivity with the gauge factor (GF) of 641, the PAM-dc-fGO film-based strain sensor can precisely detect the weak signals from the human body. Moreover, the remote monitoring of human motions with a long distance of about 100 cm has been successfully conducted by a PAM-dc-fGO proximity sensor. This work provides a new path for the development of multifunctional soft materials, and the sensors show great potential in health diagnoses and security protection applications.
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