| AVS 58th Annual International Symposium and Exhibition | |
| Graphene and Related Materials Focus Topic | Wednesday Sessions |
| Session GR+MN-WeM |
| Session: | Graphene: Mechanical and Thermal Properties, Graphene MEMS and NEMS |
| Presenter: | Kirill Bolotin, Vanderbilt University |
| Correspondent: | Click to Email |
Every atom of graphene, a monolayer of graphite, belongs to the surface. Therefore, the environment of graphene -- the substrate onto which graphene is deposited and the coating on top of graphene -- intimately affects the properties of graphene. In this talk, we demonstrate that both mechanical and electrical properties of graphene can be tuned by varying the environment of graphene.
To study the mechanical properties of graphene, we developed a novel technique that is based on measuring the temperature-dependent deflection of a “bimetallic” cantilever composed of graphene and silicon nitride or gold layers. We demonstrate that the built-in strain, the substrate adhesion force and even the thermal expansion coefficient of graphene depend on the substrate under it.
To study the electrical properties of graphene in various environments, we developed a technique to fabricate electrically contacted multiterminal suspended graphene devices that are submerged into liquids. We explore the dependence of electron mobility of graphene on dielectric constant and ionic concentration of liquids surrounding graphene. We find that ions in liquids can cause strong scattering in graphene and that very large values of mobility (>40,000 cm^2/Vs) can be achieved in ion-free liquids.