'Graphene ink' could enable folding electronics

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Northwestern University researchers have developed a graphene-based ink that is highly conductive and tolerant to bending, using it to inkjet-print graphene patterns that could be used for electrodes.

The resulting patterns are claimed to be 250 times more conductive than previous attempts to print graphene-based electronic patterns and could be a step toward low-cost, foldable electronics.

A paper describing the research, ‘Inkjet Printing of High Conductivity, Flexible Graphene Patterns,’ has been published in Journal of Physical Chemistry Letters.

‘Graphene has a unique combination of properties that is ideal for next-generation electronics, including high electrical conductivity, mechanical flexibility, and chemical stability,’ said Mark Hersam, professor of materials science and engineering at Northwestern’s McCormick School of Engineering and Applied Science. ‘By formulating an inkjet-printable ink based on graphene, we now have an inexpensive and scalable path for exploiting these properties in real-world technologies.’

Inkjet printing has previously been explored as a method for fabricating transistors, solar cells, and other electronic components. It is inexpensive, capable of printing large areas, and can create patterns on a variety of substrates, making it an attractive option for next-generation electronics. 

Inkjet printing with graphene — ultra-thin sheets of carbon with exceptional strength and conductivity — has remained a challenge because it is difficult to harvest a sufficient amount of graphene without compromising its electronic properties.

Exfoliating materials such as graphite often require oxidizing conditions that make the resulting graphene oxide material less conductive than pure carbon. Pristine unoxidised graphene can be achieved through exfoliation, but the process requires solvents whose residues also decrease conductivity.

The Northwestern researchers are said to have developed a new method for mass-producing graphene that maintains its conductivity and can be carried out at room temperature using ethanol and ethyl cellulose to exfoliate graphite.

This process minimises residues and results in a powder with a high concentration of nanometre-sized graphene flakes, which is then mixed into a solvent to create the ink.

The researchers demonstrated printing the ink in multiple layers, each 14 nanometres thick, to create precise patterns. The ink’s conductivity remains virtually unchanged, even when bent to a great degree, suggesting that graphene inks could be used to create foldable electronic devices in the future.