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Preparation of a plant-based multifunctional nanocomposite hydrogel with conductivity and self-healing property for health monitoring

Authors :

Nahid Salimiyan¹ Roya Sedghi² Sepehr Salighehdar³

1- دانشگاه شهید بهشتی 2- دانشگاه شهید بهشتی 3- دانشگاه خوارزمی

Keywords :

zwitterionic hydrogel،wearable electronics،hydroxyethyl cellulose،health-monitoring،strain sensor

Abstract :

Multifunctional and conductive hydrogels as flexible smart strain sensors have shown great potential in the areas of biomedical applications, health monitoring, soft robotics, electronic skin, and human-machine interfaces. One of the most common forms of these skin-inspired sensors are soft and flexible nanocomposites. A plant-inspired conductive hydrogel possessing zwitterionic side groups was fabricated to form a nanocomposite hydrogel. The chemical structure of the nanocomposite was developed by introducing sulfobetaine methacrylate (SBMA) to the hydroxyethyl cellulose (HEC) and MXene nanosheets were subsequently added to the polymer solutions. The SBMA zwitterionic groups endowed the nanocomposite with decent self-healing and self-adhesion properties. Moreover, the nanocomposite samples revealed tunable mechanical properties. The compressive strength reached 0.93 ± 0.02 MPa and the electrical conductivity of the hydrogel samples reached 1.15 ± 0.16 S/m. The obtained results were satisfactory for human motion sensing to a great extent. The wearable hydrogel can be attached to the human skin owing to the self-adhesion property and diverse human motions such as finger bending, wrist bending and pulse rate can be routinely monitored.