Highly Elastic and Ultrathin Nanomembrane Using Kinked Ag Nanowires for Epidermal Electrode

Skin electronic devices require a flexible conductor with properties such as metal-like conductivity, high flexibility, extremely thin thickness, and the ability to create simple patterns. Achieving these characteristics simultaneously has proven to be quite challenging. Previous research introduced a nano-membrane fabrication method using a float assembly technique to successfully address a significant portion of these challenges in creating electrodes for skin electronic devices. However, conventional nano-membranes often struggle to precisely control conductivity and flexibility due to the dense packing nature of nanowires. In this study, an innovative approach is presented to create highly flexible nano-membranes using twisted nanowires. Incorporating twisted nanowires in the nano-membrane fabrication process facilitates the formation of percolation networks at low concentrations. Furthermore, the use of twisted nanowires not only enhances flexibility but also reduces the likelihood of nanowire breakage during vertical deformation. This innovation advances the development of skin electronic devices and holds significant potential for improved flexibility, conductivity, and durability in various applications.