A Study of Graphene Hysteresis Effect in Different Solvent Environment With Suspended/Supported Graphene Device

This work reports an experimental investigation of suspended/supported graphene field-effect-transistor (GFET) hysteresis effect in different aqueous-ethanol concentration environments. Because liquid-solid interface molecular configurations can be re-orientated by external electrical fields, graphene hysteresis can be a good indicator of the composition of the liquid phase. To demonstrate this application, suspended and supported GFETs are fabricated and examined. Our result shows the suspended/ supported GFETs have different hysteresis responses to the aqueous-ethanol concentrations. It also paves a way to understand liquid-solid interfaces and indicates potentials for sensing applications.