Graphene as a substrate for assembling small organic molecules and heterostructures

Researchers at the University of Stanford in the US, the Ulsan National Institute of Science and Technology (UNIST) in South Korea and Queen’s University in the UK showed that graphene is an excellent substrate for assembling small organic molecules and that such heterostructures might be used in applications like high-performance detectors, solar cells and flexible transistors.

The researchers began by preparing suspended graphene films. They then evaporated C60 molecules onto the films to form thin-film crystals.They then made the resulting structures up into vertical transistors doped with n-type semiconducting materials and found that these devices have current on/off ratios of more than 3 x 103. Various transmission electron microscopy techniques, including selective area electron diffraction, atomic resolution TEM imaging, and van der Waals-based first principles computational methods allowed the researchers to study the structure and grain size of the crystals in detail and carefully look at the graphene-C60 interface in particular. They also noticed that the C60 films lay uniformly on the graphene substrate and that the individual molecules can assume several different molecular orientations.

Korean scientists design a graphene-based wireless sensor suitable for human skin

The Ulsan National Institute of Science and Technology has developed a transparent hybrid electronic device production technique for the manufacturing of wireless smart sensors. The is based on a combination of graphene and metal nanowires and the team says it maintains its electrical characteristics even when folded or pulled.

The smart sensor that is based on the device can be attached to various surfaces, even the human skin, for real-time monitoring of changes in biomaterials (like various proteins). The sensor wirelessly transmits the changes in biomaterials using its built-in antenna and maintains excellent flexibility even after long exposure to air and heat. The power required for the transmission and reception is supplied by its transmission antenna, and thus no battery is required.

Nitrogen-graphene mesh forms a 2D crystal with promising semiconducting attributes

Scientists from Ulsan National Institute of Science and Technology (UNIST) and Pohang University of Science and Technology in South Korea synthesised nitrogenated 2D crystals using a simple chemical reaction in liquid phase.

Introducing foreign elements (there are not carbon) into graphene's carbon lattice structure is a known way of developing other 2D crystals. Nitrogen has a suitable atomic size and structure to fit into a strong network of carbon atoms, by creating bonds in which electrons are shared by the whole network.

New 2D crystal might surpass graphene's electrical features

Researchers at the Ulsan National Institute of Science and Technology (UNIST) in Korea managed to synthesize a new multifunctional 2D ordered crystal structure, designated as C2N-h2D crystal, that they claim exhibits more enhanced electrical features than those of graphene. 

The thin-layered micrometre-sized 2D crystal was the result of a reaction between ​hexaaminobenzene trihydrochloride and ​hexaketocyclohexane octahydrate and it exhibits a strong semiconducting nature, as it has a large Ion/Ioff ratio that equals a fast switching speed for semiconducting devices. The Ion/Ioff ratio of the C2N-h2D crystal was confirmed to be 100 times more efficient than current silicone semiconductors in production.

A Korean agreement for graphene mass production technology

A strategic cooperation agreement of a mass production of graphene technology transfer has recently been signed between the Korean UNIST (Ulsan National Institute of Technology) and Deokyang Energen Corp. (one of Korea's prominent industrial gas producers). 

Under this agreement, the technology for mass production of graphene will be moved to Deokyang Energen Corp. and will be widely used for commercial applications. Ulsan says that the value of this technique is about $1 billion USD and 1.5% of total gross, created from this technique will be also added to this value as a license issue fee.