Stretchable conductive materials have attracted great attention due to their potential applications ranging from strain sensors, wearable electronics, and medical devices. The fabrication of these materials with customized object geometries is desirable, but the methods to achieve them is still highly limited. 3D printing can generate sophisticated object geometries, but there is still a significant need to print with materials that afford improved conductivity, mechanical properties, and elastic recovery. Herein, we developed 3D printed stretchable strain sensors based on vat photopolymerization of ionic liquid polymer networks. 3D objects with a range of geometrical designs were printed, and the application of compressing, stretching, and bending loads were detected as real-time changes in conductivity. These ionic liquid resins are compatible with commercial 3D printers, which enhances their applicability for on-demand production of customized devices.

3D printing of ionic liquid polymer network for stretchable sensors

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