Inkjet Printing of High Conductivity, Flexible Graphene Patterns.
The ability to print high conductivity, conformal, and flexible electrodes is an important technological challenge in printed electronics, especially for large-area formats with low cost considerations. In this Letter, we demonstrate inkjet-printed, high conductivity graphene patterns that are suitable for flexible electronics. The ink is prepared by solution-phase exfoliation of graphene using an environmentally benign solvent, ethanol, and a stabilizing polymer, ethyl cellulose. The inkjet-printed graphene features attain low resistivity of 4 mΩ·cm after a thermal anneal at 250 °C for 30 min while showing uniform morphology, compatibility with flexible substrates, and excellent tolerance to bending stresses.
†Department of Materials Science and Engineering, ‡Department of Chemistry, and §Department of Medicine, Northwestern University, Evanston, Illinois 60208, United States.
Ethan B
EB
Secor
†Department of Materials Science and Engineering, ‡Department of Chemistry, and §Department of Medicine, Northwestern University, Evanston, Illinois 60208, United States.
Pradyumna L
PL
Prabhumirashi
†Department of Materials Science and Engineering, ‡Department of Chemistry, and §Department of Medicine, Northwestern University, Evanston, Illinois 60208, United States.
Kanan
K
Puntambekar
†Department of Materials Science and Engineering, ‡Department of Chemistry, and §Department of Medicine, Northwestern University, Evanston, Illinois 60208, United States.
Michael L
ML
Geier
†Department of Materials Science and Engineering, ‡Department of Chemistry, and §Department of Medicine, Northwestern University, Evanston, Illinois 60208, United States.
Mark C
MC
Hersam
carbon; electrode; electronics; exfoliation; nanomaterial; solution-phase