Graphene-related material has role in transistors

Scientists at Liverpool University have created a new, graphene-related  material that has the potential to improve transistors used in electronic devices.

The new material, triazine-based graphitic carbon nitride (TGCN), was predicted theoretically in 1996 and has been fabricated for the first time at the university.

Graphene is one atom thick, strong and conducts heat and electricity highly efficiently. The new TGCN material is also two-dimensional, but it has an electronic band gap, making it potentially suitable for use in transistors.

Transistors are currently made of silicon that generates heat when used in electronic devices. Scientists have been looking for a material that is carbon-based and that has the electronic band gap needed for use as a semiconductor.

In a statement, Prof Andrew Cooper, a chemist from the University’s Department of Chemistry, said: ‘This is an exciting result because there are relatively few ordered two-dimensional organic solids. Finding a new member of the graphene family is very significant.’

Starting with the molecule dicyandiamide, the team prepared crystals of graphitic carbon nitride, a two-dimensional layered material that is similar to graphene that contains nitrogen.

They combined these in a quartz tube and heated them for 62 hours at up to 600°C. The result is a liquid containing flakes of TGCN that can be removed by filtering or peeling them off the quartz tube.

The material is at an early stage of development and Prof Cooper believes the next stage in the research is to explore its properties.

He said: ‘The creation and analysis of this material is just the first step. We now have a lot more work to do to scale it up and prove function in electronic devices.’

The research project, funded by an Engineering and Physical Sciences Research Council (EPSRC) Programme Grant at Liverpool, also involved chemistry, physics, and materials science researchers from across Europe.

This team included scientists at Technical University Berlin, Ulm University, Aalto University, Humboldt University Berlin, University College London, University of East Anglia, University of Helsinki, and the Max Planck Institute for Colloids and Interfaces.

The study was published in the journal Angewandte Chemie.