Flexible transparent graphene electrodes may enable electronic tattoos

Researchesr from Korea's Ulsan, KAIST and ETRI institutes developed a process that produces flexible transparent graphene electrodes that can be attached to the skin (or any kind of delicate object). This could enable applications such as electronic tattoo-like stickers or bio-signal sensors.

A graphene metal fiber composite ise used, which lowers the resistance of the transparent electrode to approximately 1/20th of existing ones. This enables the electrodes to be used in flexible displays or sensors. The new process is similar to a widely-used semiconductor process which means that this can be scaled commercially.

Researchers find way to fix graphene grain-boundary defects

Researchers from Korea's Ulsan National Institute of Science and Technology developed a technique to repair graphene line defects by selectively depositing metal (Platinum). Graphene grain boundary defects harm the material's properties, and the new method can be used to address this issue.

Using Atomic Layer Deposition (ALD), the researchers managed to use the platinum metal and deposit it on the line defects. The researchers used the new improved sheets to develop electrodes and hydrogen gas sensors at room temperature. In these two applications, the enhanced sheets outperformed the original graphene sheets three times over.

The researchers now say they want to try different metals (such as gold and silver), and also test other applications.

Boron and nitrogen doping opens up a bandgop in graphene nanoplatelets

Researchers from Korea's Ulsan National Institute of Science and Technology (UNITS) developed new graphene-based FETs (G-FETs), based on boron/nitrogen co-doped graphene nanoplatelets.

The researchers major breakthrough is the development of a new efficient method to produce those BCN-graphene platelets via a simple solvothermal reaction using potassium. Doping the GNPs opens up a bandgap.

Doped graphene oxide used to make high performance fuel-cell electrocatalyst

Researchers from Korea's Ulsan institute developed a high performance Oxygen Reduction Reaction (ORR) electrocatalyst using chemical functionalized (doped) graphene oxide. ORR electrocatalysts, which split hydrogen gas to make electricity are critical components in fuel cells and some batteries.

The researchers used covalent functionalization of various small organic molecules with a subsequent thermal treatment, which resulted in thin films. The researchers say they achieved a simple approach to introduce nitrogen atoms on graphene oxide sheets, without a toxic gas precursor and with a good doping degree control.

Researchers develop low-cost way to dope GNPs with Nitrogen

Researchers from Korea's Ulsan National Institute of Science and Technology (UNIST) developed a simple and low-cost way to dope graphene nanoplatelets (GNPs) with Nitrogen. These new materials may prove useful for dye-sensitized solar cells and fuel cells.

The researchers used dry ball-milling and they say that this is an efficient way to chemically modify the graphene flakes. This is more useful than current ways (most commonly the Harber-Bosch process, which requires extreme pressure and temperature conditions).