2, Seoul National University of Science and Technology, Seoul, , Korea (the Republic of)
3, Korea University, Seoul, , Korea (the Republic of)
4, Korea University, Seoul, , Korea (the Republic of)
Electronic materials with percolating structures have been attracting tremendous interest in the fields of stretchable electrodes, transparent conducting electrodes, energy storage/conversion devices, wearable electronics and sensors, and bio-interfacing materials. Percolating structures can provide large effective surface area of electronic materials, enabling efficient interfacing with ionic systems such as biological, biochemical, and electrochemical systems as well as mechanical flexibility. Single-walled carbon nanotubes (SWNTs), rolled-up sheets of graphene, are attractive nanoscale electronic materials for fabricating percolating electronic materials owing to their extremely large aspect ratio and excellent electrical and mechanical properties. In this presentation, a biological material-based method to assemble electronic nanomesh of SWNTs in solution and produce patterns of SWNT-nanomesh on flexible substrates with excellent control of nanostructures will be introduced. In our approach, a genetically engineered filamentous M13 phage with strong binding affinity toward SWNTs controls and stabilizes the nanostructures of the SWNT-nanomesh during a hydrodynamic process. This unique biological material-based in-solution assembly process enables the realization of electronic nanomesh of SWNTs, independent of the substrate, as well as the delivery of intact nanostructures with excellent electrical and electrochemical properties onto large-scale flexible devices. The assembled SWNT-nanomesh can greatly reduce the in vivo contact impedance of a flexible 40-channel microarray and significantly increase the detection rate of high frequency brain signals (HFBS) on a mouse skull. In addition, flexible biosensors and bioelectronic devices are successfully realized by employing the SWNT-nanomesh as a key interface material.