Along with partners in the Army and other researchers at Stevens Institute of Technology, Dr. Woo Lee the George Meade Bond Professor in the Department of Chemical Engineering and Materials Science in the Schaefer School of Engineering and Science at Stevens is advancing printed electronics through the recent demonstration of a method to inkjet print electrical energy storage devices using graphene. Made of carbon sheets one atom thick, graphene has quickly become a go-to material for the next-generation of nanoscale and microscale devices. Dr. Lee’s team was recognized with the Academic R&D Award at Printed Electronics USA 2011 for combining the potential of graphene with precision inkjet printing technologies.
“The printed graphene research conducted by Dr. Lee and his collaborators is destined to fundamentally change how low-cost, electronic consumer goods are produced in the future,” said Dr. Michael Bruno, Dean of the Schaefer School of Engineering and Science. “Their work also demonstrates the sort of promising outcomes we have grown to expect from the long-running research relationship between the US Army and Stevens faculty.”
Although a common artifact of the home or office, inkjet printers have also emerged as a scientific tool for depositing materials both precisely and efficiently. For his research, Dr. Lee’s “ink” is a suspension of graphene oxide in water, which, after printing, is thermally reduced to produce graphene. The resulting material has useful characteristics including electrical conductivity, high surface area for energy storage, good mechanical strength to withstand everyday use, and transparent appearance.
Using an inkjet printer that can form and meticulously place graphene oxide droplets with a volume of 10 picoliters (1 x 10e-11 liters), Dr. Lee can realize graphene electrodes for the printed electronics industry.
“Our process allows us to print graphene droplets at a resolution down to around 50 micrometers,” reported Dr. Lee. “Such precision inkjet-printing techniques require minimal handling of nanomaterials, generate very little wasted material, and can easily scale up by adapting our methods to commercial printers.”
This is not Dr. Lee’s first application of the inkjet printer. He currently receives funding from the National Science Foundation to investigate inkjet printing of drug-eluting micropatterns onto the surface of orthopedic implants. These biocompatible patterns of nanoparticles fight bacterial infection after orthopedic surgeries, a major cause for implant failure, and promote bone formation around new implants.