Sustainable antibacterial collagen composites with silver nanowires for resistive pressure sensor applications

Considering the circular economy and the increasing need of smart materials for the digitalization of society, it is essential that these materials are based on bio-resources. Thus, in order to replace synthetic by natural polymers in multifunctional composites, this work reports on the development of collagen/silver nanowires (Ag NWs) composites for resistive sensor applications. It is demonstrated the physical interactions of hydroxyl groups in collagen with the Ag NWs and that the Ag NWs are well dispersed within the collagen matrix. Further, the addition of Ag NWs to the collagen matrix increases the thermal stability of collagen and the Ag NW content does not affect the triple helix structure of the polymer matrix. The mechanical, electrical and antibacterial properties depend on Ag NW content and the best electric conductivity of 0.0515 S cm-1 is obtained for composites with 6 wt% of Ag NWs. This composite presents suitable resistance variations under pressure and bending allowing the development of sustainable multifunctional sensing composites with antibacterial activity that can be applied in next generation touch sensing electronic devices.

Automated summary

This study focuses on the development of collagen/silver nanowires (Ag NWs) composites for resistive sensor applications, aiming to replace synthetic polymers with natural polymers. The study reveals the physical interactions between hydroxyl groups in collagen and Ag NWs, as well as the well dispersion of Ag NWs within the collagen matrix. The addition of Ag NWs improves the thermal stability of collagen without affecting its triple helix structure. The composites with 6 wt% of Ag NWs exhibit the highest electrical conductivity of 0.0515 S cm-1, making them suitable for sustainable multifunctional sensing composites in next generation touch sensing electronic devices.