The objective of the CHACAL research program is to better understand the behaviour and mechanical stability of 2D materials under local mechanical stresses, with a particular focus on their response/resistance to buckling under compressive stresses. <br />Our experimental approach consists in synthesizing/characterizing graphene on substrates of interest, and then thermo-mechanically stressing them.
The ultimate goal is to identify the genesis of specific morphological structures on the interacting 2D materials, by a controlled mechanical nano-engineering.
The new experimental data obtained at the nanometer scale by near-field microscopy (on the Nanoplast and Mammouth test devices) will then be compared with numerical simulations by atomic potentials in molecular dynamics simulations and ab initio calculations.
- CVD growth of single-sheet graphene on polycrystalline Cu substrates
- Confirmation of the validity of continuum mechanics laws to understand the single-sheet graphene buckling
- Optimisation of graphene growth on Cu crystals
- Graphene transfer onto polymer substrates
- Molecular dynamics simulations of the graphene/Cu single crystal system under compressive stresses
« Experimental study and development of CVD processes for graphene grown on bulk polycrystalline and single Cu crystals »
Poster et « Graphene 2021 » (26-29/10/2021)
The aim of the research project CHACAL is to have a better understanding of the mechanical stability of 2D materials under localized
stress. The experimental original approach consists in using the emergence process of dislocations at the 2D materials/substrate
interface, coming from the plastically-deformed substrates. The mechanical behavior of foils under different mechanical conditions is
investigated at the atomic scale by scanning tunneling microscopy (taking advantage of the original experimental UHV set-up
Nanoplast), in order to identify, or even control, the appearance of specific morphological nanostructures. The experimental
UHV-STM data are compared with molecular dynamic simulations by atomic potentials.
Monsieur Christophe COUPEAU (Institut P' : Recherche et Ingénierie en Matériaux, Mécanique et Energétique)
The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.
Pprime Institut P' : Recherche et Ingénierie en Matériaux, Mécanique et Energétique
NEEL Institut Néel
Help of the ANR 448,770 euros
Beginning and duration of the scientific project: October 2019 - 48 Months