Centre d’Élaboration de Matériaux et d’Etudes Structurales

Accueil > Recherche > M3 : Matériaux Multi-échelles Multifonctionnels > Carbones nanostructurés > Understanding the carbonisation-graphitisation processes

Probing heat flow in large graphene bubbles

JPEG - 34.2 ko
Schéma de la bulle de graphène sur un substrat d’interférentiel avec l’onde stationnaire optique. La tache rouge indique où la bulle chauffe le plus.

The highly elastic and flexible nature of graphene allows the creation of stable large bubbles on its surface (several micrometers wide and one micrometer high) in a more or less controlled fashion. Such bubbles might serve as micro-lenses or be used to control the morphology of graphene on surfaces or to chemically functionalize graphene on selected regions. When graphene is illuminated with a laser beam, incident and reflected beams overlap forming an optical standing wave on the surface. While the large graphene bubble is not disturbed much by the standing wave, increasing the laser power has the effect of selectively heating the graphene bubble at the interference maxima of the standing optical wave. Such local changes in temperature can be detected by following the spectral shifts in the vibrational spectrum of graphene, where oscillations in shift and intensity of a spectral peak are recorded when scanning the laser spot across the graphene bubble.

Collaboration with R. Ruoff, Unist