Inkjet Printing of High Conductivity, Flexible Graphene\nPatterns

Abstract

The ability to print high conductivity,\nconformal, and flexible\nelectrodes is an important technological challenge in printed electronics,\nespecially for large-area formats with low cost considerations. In\nthis Letter, we demonstrate inkjet-printed, high conductivity graphene\npatterns that are suitable for flexible electronics. The ink is prepared\nby solution-phase exfoliation of graphene using an environmentally\nbenign solvent, ethanol, and a stabilizing polymer, ethyl cellulose.\nThe inkjet-printed graphene features attain low resistivity of 4 mΩ·cm\nafter a thermal anneal at 250 °C for 30 min while showing uniform\nmorphology, compatibility with flexible substrates, and excellent\ntolerance to bending stresses.