期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 40, 页码 45306-45314出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c13653
关键词
poly(dimethylsiloxane); MXenes; biomolecules; self-healing; conductive composite
资金
- Shandong Provincial Natural Science Foundation [ZR2018MB034, ZR2019QB019]
- National Natural Science Foundation of China [51872150]
- Talent Fund of Shandong Collaborative Innovation Center of Eco-Chemical Engineering [XTCXQN11]
- Open Subject Fund of the State Key Laboratory Base for Eco-Chemical Engineering in College of Chemical Engineering [STHG1804]
- QingChuang Science and Technology Plan Project of Colleges and Universities in Shandong Province [2020KJC005]
Flexible conductive composites can be used as wearable strain sensors, which are widely used in the fields of new-generation robotics, electronic skin, and human detection. However, how to make conductive composites that simultaneously possess flexibility, stretchability, self-healing, and sensing capability is challenging research. In this work, we innovatively designed and prepared a silicone polymer conductive composite. MXenes and amino poly(dimethylsiloxane) were modified by small biomolecules via an esterification reaction and a Schiff base reaction, respectively. The modified MXenes are uniformly dispersed, which endows the composite with good electrical conductivity. The reversibility of multiple hydrogen bonds and imine bonds in the composite system makes it have ideal tensile properties and high-efficiency self-healing ability without external stimulation. The conductive composite containing 10 wt % A-MXenes showed an elongation of 81%, and its mechanical strength could reach 1.81 MPa. After repair, the tensile properties and the electrical conductivity could be restored to 98.4 and 97.6%, respectively. In addition, the conductive composite is further evaluated for the value of wearable strain sensors. Even after cut-healed processes, the conductive composite can still accurately detect tiny human movements (including speaking, swallowing, and pressing). This kind of self-healing MXene/PDMS elastomers based on the modification of small biomolecules has great potential as wearable strain sensors. This simple preparation method provides guidance for future multifunctional flexible electronic materials.
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