Researchers make major breakthrough in smart printed electronics

April 6, 2017
Prof Jonathan Coleman has fabricated printed transistors consisting entirely of 2-dimensional nanomaterials for the first time. Credit: AMBER, Trinity College Dublin

Researchers in AMBER, the Science Foundation Ireland-funded materials science research centre hosted in Trinity College Dublin, have fabricated printed transistors consisting entirely of 2-dimensional nanomaterials for the first time. These 2D materials combine exciting electronic properties with the potential for low-cost production. This breakthrough could unlock the potential for applications such as food packaging that displays a digital countdown to warn you of spoiling, wine labels that alert you when your white wine is at its optimum temperature, or even a window pane that shows the day's forecast. The AMBER team's findings have been published today in the leading journal Science.

This discovery opens the path for industry, such as ICT and pharmaceutical, to cheaply print a host of electronic devices from solar cells to LEDs with applications from interactive smart food and drug labels to next-generation banknote security and e-passports.

Prof Jonathan Coleman, who is an investigator in AMBER and Trinity's School of Physics, said, "In the future, printed devices will be incorporated into even the most mundane objects such as labels, posters and packaging. Printed electronic circuitry (constructed from the devices we have created) will allow consumer products to gather, process, display and transmit information: for example, milk cartons could send messages to your phone warning that the milk is about to go out-of-date.

We believe that 2D nanomaterials can compete with the currently used for . Compared to other materials employed in this field, our 2D nanomaterials have the capability to yield more cost effective and higher performance printed devices. However, while the last decade has underlined the potential of 2D materials for a range of electronic applications, only the first steps have been taken to demonstrate their worth in printed electronics. This publication is important because it shows that conducting, semiconducting and insulating 2D nanomaterials can be combined together in complex devices. We felt that it was critically important to focus on printing transistors as they are the electric switches at the heart of modern computing. We believe this work opens the way to print a whole host of devices solely from 2D nanosheets."

Prof Jonathan Coleman and team have fabricated printed transistors consisting entirely of 2-dimensional nanomaterials for the first time. Credit: AMBER, Trinity College Dublin

Led by Prof Coleman, in collaboration with the groups of Prof Georg Duesberg (AMBER) and Prof. Laurens Siebbeles (TU Delft, Netherlands), the team used standard printing techniques to combine graphene nanosheets as the electrodes with two other nanomaterials, tungsten diselenide and as the channel and separator (two important parts of a transistor) to form an all-printed, all-nanosheet, working transistor.

Printable electronics have developed over the last thirty years based mainly on printable carbon-based molecules. While these molecules can easily be turned into printable inks, such materials are somewhat unstable and have well-known performance limitations. There have been many attempts to surpass these obstacles using alternative materials, such as carbon nanotubes or inorganic nanoparticles, but these materials have also shown limitations in either performance or in manufacturability. While the performance of printed 2D devices cannot yet compare with advanced transistors, the team believe there is a wide scope to improve performance beyond the current state-of-the-art for printed transistors.

The ability to print 2D nanomaterials is based on Prof. Coleman's scalable method of producing 2D nanomaterials, including graphene, boron nitride, and tungsten diselenide nanosheets, in liquids, a method he has licensed to Samsung and Thomas Swan. These nanosheets are flat nanoparticles that are a few nanometres thick but hundreds of nanometres wide. Critically, nanosheets made from different materials have electronic properties that can be conducting, insulating or semiconducting and so include all the building blocks of electronics. Liquid processing is especially advantageous in that it yields large quantities of high quality 2D materials in a form that is easy to process into inks. Prof. Coleman's publication provides the potential to print circuitry at extremely low cost which will facilitate a range of applications from animated posters to smart labels.

Explore further: Scalable 100 percent yield production of conductive graphene inks

More information: "All-printed thin-film transistors from networks of liquid-exfoliated nanosheets" Science (2017). science.sciencemag.org/cgi/doi … 1126/science.aal4062

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antialias_physorg
5 / 5 (2) Apr 07, 2017
for example, milk cartons could send messages to your phone warning that the milk is about to go out-of-date.

Ya know, this is akin to the (for decades!) bandied about "your fridge will tell you when you are out of cheese and need to buy some more"...which is basically the only IoT feature that anyone has ever come up with in all that time.

And I have yet to meet anyone who would actually need/use this feature.

IoT is one of these ideas that look cool on paper but are - in reality - absolutely useless.
there's certainly something to be said for distributed/autonomous sensors in streets/bridges/airplanes that monitor for fatigue and the like. But on a personal level (even something like a 'home automation network') seems rather superfluous - if not downright dangerous/abusable.

(Not knocking the research: printable electronics will have their uses - just not in IoT)
PPihkala
not rated yet Apr 07, 2017
This is just the beginning like with portable phones that were expensive, bulky and impractical. Now after lots of refining some peoples lifes go round around cell phones. The same might happen with printable electronics when it is capable enough and inexpensive. Tech needs to be inexpensive to be widely used, which also makes it cheaper, because of economics of mass production.
st4rcutter
not rated yet Apr 13, 2017
antialias_physorg,

I think your assumptions about the usefulness of IoT are far too early to have any credibility. The smart/connected city examples you give as success are simply the easiest to monetize as they quickly deliver cost savings in the form of safety, security or energy efficiency. IoT is on the cusp of moving beyond just cute applications such as warning you about old food. Within the next 5-10 years major portions of retail may be moving to a completely automated model where users buy online or through their smartphones and simply walk in and walk out with their merchandise. This is trialing now and is completely enabled by IoT and RFID technologies - those same technologies that would be improved and expanded on by developments such as this. Similar technologies could completely automate major functions in fast-food. Everything from how the order is placed to how it's made, assembled, and made ready for the consumer.

Just wait...
antialias_physorg
not rated yet Apr 13, 2017
where users buy online or through their smartphones and simply walk in and walk out with their merchandise.

We have that already. Without IoT. It's called RFID patches. There's absolutely no point for any of your merchandise to be on the internet (or in an own subnet) for any of this.
All I am currently seeing from IoT devices is that they are being hacked and abused (for DDOS attacks or for stuff like telling thieves when you aren't home). There's no benefit for dragging them into your home at all

Even the home automation is pretty much BS. How hard is it to turn a dial on a heater? What exactly is the advanage of a network of home appliances talking to one another or controlling them from afar? (Well, I can tell you a downside. Friend of mine has the doors/shutters lock automatically when the internal IR/movement sensors detect no one is in the house for 30 minutes. Guess what happened when he sat in his garden for an hour?)

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