Details

Project TitleGraphene ink for screen printing
Track Code2014-154
Short Description

Novel pristine graphene ink with high conductivity for fabrication of flexible electronic devices #materials #graphene/graphite #inks 

Abstract

Printed conductive inks represent a significant global market and are expected to increase in use with emerging applications in printed and flexible electronics. Typical conductive inks fall into three categories: metal particles, which are relatively expensive; conducting polymers, which have limited environmental stability; and carbon-based inks, which have relatively low conductivity. Graphene represents an alternative conducting material that balances these limitations. The present invention provides concentrated dispersions of graphene with high colloidal stability and viscosity suitable for screen printing. Northwestern researchers have achieved high-resolution screen print patterning of pristine graphene with these inks using a silicon stencil on flexible substrates. Following mild annealing, the printed patterns exhibit high electrical conductivity and desirable mechanical durability. The technology generates high-quality graphene patterns, with resolution lines as narrow as 40 µm versus 75 to 150 µm resolution observed with conventional screen printing methods. The inks promise fabrication of finer patterns to facilitate higher integration density and improved device performance. 

 
Tagsmaterials, MATERIALS: graphene/graphite, MATERIALS: inks
 
Posted DateFeb 20, 2015 10:25 AM

Applications

  • Printed displays for consumer electronics
  • Radio frequency identification tags
  • Environmental and biomedical sensors
  • Intelligent packaging and textiles
  • Flexible energy harvesting/storage devices
  • Printed circuit boards 

Advantages

  • High environmental stability relative to conventional conductive polymers
  • Inexpensive raw materials are used unlike with conventional inks
  • Good dispersion stability, ink versatility, and high conductivity 

Publications

Hyun WJ, Secor EB, Hersam MC, Frisbie CD, Francis LF. High-Resolution Patterning of Graphene by Screen Printing with a Silicon Stencil for Highly Flexible Printed Electronics (2015). Advanced Materials. 27(1): 109-115.

Inventors

IP Status

A patent application has been filed.

Marketing Contact

Allan E. Nader, Ph.D.

Invention Manager

(T): (847) 491-4456

(E):  a-nader@northwestern.edu

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