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Water-Based, Biocompatible 2D Inks for Printed Electronics

January 31, 2017 By University of Manchester

(Credit: University of Manchester)

Researchers at The University of Manchester have developed a method of producing water-based and inkjet printable 2D material inks, which could bring 2D crystal heterostructures from the lab into real-world products.

Examples include efficient light detectors, and devices that are able to store information encoded in binary form which have been demonstrated, in collaboration with the University of Pisa.

Graphene is the world’s first 2D material: 200 times stronger than steel, lightweight, flexible and more conductive of copper. Since graphene’s isolation in 2004 the family of 2D materials has expanded.

Using graphene and other 2D materials, scientists can layer these materials, similar to stacking bricks of Lego in a precisely chosen sequence, known as “heterostructure”, to create devices tailored to a specific purpose.

As reported in Nature Nanotechnology a team led by Professor Cinzia Casiraghi have developed a method of producing water-based and inkjet printable 2D material inks, which can be used for the fabrication of a wide range of heterostructures by fully exploiting the design flexibility offered by a simple technique such as inkjet printing.

Current ink formulations, which would allow heterostructures to be made by simple and low-cost methods, are far from ideal- either containing toxic solvents or requiring time-consuming and expensive processes. In addition, none of these is optimised for heterostructure fabrication.

Prof. Cinzia Casiraghi says: “Due to the simplicity, flexibility and low cost of device fabrication, we envisage this technology to find potential in smart packaging applications, for example for pharmaceuticals and consumer goods. We are also very excited about the possibility of implementing logic circuits made of 2D materials – indeed, we are further developing these type of devices with our colleagues in Pisa”.

Daryl McManus, PhD. student says: “These inks provide a perfect platform to fully exploit the range of properties of 2D materials by allowing for the first time a precise and scalable method for fabrication of devices of arbitrary complexity utilising 2D materials”.

Most notably these inks are also biocompatible, which extends their possible use to biomedical applications.

Prof. Kostas Kostarelos, Professor of Nanomedicine says: “The engineering of water-soluble 2D inks that are compatible with the biological milieu and interact with organisms without harm can provide a platform of huge potential for a wide range of applications. We are certainly looking at this as the beginning for such inks in the biomedical arena.”

 

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