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science festival 2017 2

  "Strain and piezo-doping mismatch between graphene layers" A. Forestier et al, Journal of Physical Chemistry C

Graphene is the ultimate foil with the thickness of an atomic layer. Two sheets of graphene is therefore... the ultimate book. We have shown that it is possible to "read" each oneof the pages of this book separately using a laser light and even more, during “printing”.  What is written, the electric charge or the internal deformation of the sheets, is certainly less bewitching than Yeat's verses, but is of great technological interest. Indeed, these two parameters make it possible to adjust the physico-chemical properties of graphene for applications in fields such as electronics or sensor development. We have shown that these parameters can be controlled ("written") and "read" separately on each graphene sheet by subjecting it to high pressures. We did this by using different carbon isotopes for each of the graphene sheets and taking advantage of their interaction with a laser beam.

This work has been done in collaboration with colleagues from the Federal University of Piaui (Brazil) and the Academy of Sciences of the Czech Republic.