Invented by Professor Saverio & Professor Craciun at the Centre for Graphene Science, GraphExeter is a flexible, transparent and highly conductive thin film material with extraordinary mechanical, optical and electrical properties.  The material is manufactured by intercalating Few Layer Graphene (FLG) with Ferric Chloride molecules.  It tolerates 100% humidity and operates at temperatures > 600 degC.   It is the subject of International Patent Application No. PCT/GB2014/052913.

Electrical & Optical Properties

With a sheet resistance in the order 10Ω/sq the electrical and thermal conductivity of GraphExeter compares to alternative conductive films.  It also has excellent optical transmission characteristics in the  400nm - 850nm band, rendering transparency characteristics that compare well with other conductive transparent films in the visible spectrum, but outperforms others in the infra red spectrum. 

Flexible & Strong

GraphExeter is 100x stronger than steel and is a surprisingly resilient and robust material capable of operating in harsh environments.  It withstands operating environments with 100% humidity and tolerates temperatures >600 deg C.  Most importantly, GraphExeter is flexible and can be applied to crushable substrates like cloth, fabrics and other materials that are immensely challenging environments for the emerging flexible electronics industry.  

Lab-scale Fabrication

The fabrication of devices is carried out in our clean room, which has state-of-the-art lithography and etching systems to fit a wide range of custom demands. 

Fabricated material is routinely characterised with Raman spectroscopy, low-noise electrical transport and magneto-transport measurements, optical absorption and reflection, scanning electron microscopy, X-ray diffraction and tunneling electron microscopy.

Monolayer CVD graphene is grown on copper foil and can be manufactured in various sizes from 1cm x 1cm to sheets up to 17" across the diagonal.