Researchers from Imperial College London, Durham University, University of Cambridge, The Chinese University of Hong Kong, Zhejiang University, Beihang University, Nanjing Tech University, Macquarie University, University of British Columbia and Aalto University have collaborated to examine the "coffee ring effect" which has been hindering the industrial deployment of functional inks with graphene, 2D materials, and nanoparticles because it makes printed electronic devices behave irregularly.
The team of researchers has now created a new family of inks that overcomes this problem, enabling the fabrication of new electronics such as sensors, light detectors, batteries and solar cells.
The researchers, led by Tawfique Hasan from the Cambridge Graphene Centre of the University of Cambridge, with Colin Bain from the Department of Chemistry of Durham University, and Meng Zhang from School of Electronic and Information Engineering of Beihang University, studied the physics of ink droplets combining particle tracking in high-speed micro-photography, fluid mechanics, and different combinations of solvents.
Their solution: alcohol, specifically a mixture of isopropyl alcohol and 2-butanol. Using these, ink particles tend to distribute evenly across the droplet, generating shapes with uniform thickness and properties.
The natural form of ink droplets is spherical however, because of their composition, our ink droplets adopt pancake shapes, said Hasan.
While drying, the new ink droplets deform smoothly across the surface, spreading particles consistently. Using this universal formulation, manufacturers could adopt inkjet printing as a cheap, easy-to-access strategy for the fabrication of electronic devices and sensors. The new inks also avoid the use of polymers or surfactants commercial additives used to tackle the coffee ring effect, but at the same time thwart the electronic properties of graphene and other 2D materials.
Most importantly, the new methodology enables reproducibility and scalability researchers managed to print 4500 nearly identical devices on a silicon wafer and plastic substrate. In particular, they printed gas sensors and photodetectors, both displaying very little variations in performance. Previously, printing a few hundred such devices was considered a success, even if they showed uneven behavior.
Understanding this fundamental behavior of ink droplets has allowed us to find this ideal solution for inkjet printing all kinds of two-dimensional crystals, said first author Guohua Hu. Our formulation can be easily scaled up to print new electronic devices on silicon wafers, or plastics, and even in spray painting and wearables, already matching or exceeding the manufacturability requirements for printed devices.
Beyond graphene, the team has optimized over a dozen ink formulations containing different materials. Some of them are graphene two-dimensional ‘cousins’ such as black phosphorus and boron nitride, others are more complex structures like heterostructures ‘sandwiches’ of different 2D materials and nanostructured materials. Researchers say their ink formulations can also print pure nanoparticles and organic molecules.This variety of materials could boost the manufacturing of electronic and photonic devices, as well as more efficient catalysts, solar cells, batteries and functional coatings.
The team expects to see industrial applications of this technology very soon. Their first proofs of concept printed sensors and photodetectors have shown promising results in terms of sensitivity and consistency, exceeding the usual industry requirements. This should attract investors interested in printed and flexible electronics.
Our technology could speed up the adoption of inexpensive, low-power, ultra-connected sensors for the internet of things, said Hasan. The dream of smart cities will come true.
