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Self-healable polysiloxane/graphene nanocomposite and its application in pressure sensor
- Zhao, Liwei, Jiang, Bo, Huang, Yudong
- Journal of materials science 2019 v.54 no.7 pp. 5472-5483
- crosslinking, cycloaddition reactions, electronic equipment, graphene, nanocomposites, nanosheets, polydimethylsiloxane, rheology, tensile strength
- Polysiloxane is an ideal material for the preparation of wearable and flexible electronic devices. The preparation of pressure sensor using polysiloxane with both self-healing properties and excellent mechanical properties remains a key challenge. This work reports a self-healable pressure sensor based on polysiloxane network cross-linked by dynamic Diels–Alder bonds. The self-healable polysiloxane underwent a solid–liquid–solid transformation during a self-healing process, which has been confirmed by rheology. Depending on the amount of the linear reactive polydimethylsiloxane, mechanical performance and stretchability of the self-healable polysiloxane were tunable. By incorporating graphene nanosheets into polysiloxane elastomer, we fabricated a self-healable nanocomposite with significantly improved tensile stress and excellent electromechanical property. The tensile stress of nanocomposite containing 35 wt% graphene was 1.09 MPa that was improved by more than 1700% compared to that of the elastomer, indicating a significant improvement of the tensile stress with stretchability. The prepared self-healable pressure sensor exhibits a high sensitivity of 0.765 kPa⁻¹ and a gauge factor of 4.87, demonstrating a promising potential use in the pressure sensors.