4.6 Article

Self-Healable Elastomeric Network with Dynamic Disulfide, Imine, and Hydrogen Bonds for Flexible Strain Sensor

Journal

CHEMISTRY-A EUROPEAN JOURNAL
Volume -, Issue -, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202203478

Keywords

dynamic covalent bonds; flexible strain sensor; human motion detection; polysiloxane elastomer; self-healing

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A self-healable and stretchable strain sensor (PIH2T1-tri/CNT-3) composed of a self-repairable crosslinked elastomer substrate (PIH2T1-tri) and a conductive layer (carbon nanotube, CNT) was prepared. The PIH2T1-tri elastomer exhibited excellent self-healing ability (91 % healing efficiency) and good mechanical properties. The PIH2T1-tri/CNT-3 sensor demonstrated effective self-healing function for electrical conduction and sensing, with high sensitivity, short response time, and long-term durability.
Self-healable and stretchable elastomeric material is essential for the development of flexible electronics devices to ensure their stable performance. In this study, a strain sensor (PIH2T1-tri/CNT-3) composed of self-repairable crosslinked elastomer substrate (PIH2T1-tri, containing multiple reversible repairing sites such as disulfide, imine, and hydrogen bonds) and conductive layer (carbon nanotube, CNT) was prepared. The PIH2T1-tri elastomer had excellent self-healing ability (healing efficiency=91 %). It exhibited good mechanical integrity in terms of elongation at break (672 %), tensile strength (1.41 MPa). The Young's modulus (0.39 MPa) was close to that of human skin. The PIH2T1-tri/CNT-3 sensor also demonstrated an effective self-healing function for electrical conduction and sensing property. Meanwhile, it had high sensitivity (gauge factor (GF)=24.1), short response time (120 ms), and long-term durability (4000 cycles). This study offers a novel self-healable elastomer platform with carbon based conductive components to develop flexible strain sensors towards high performance soft electronics.

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