Figure 1.

Cyclohexane and water interface for graphene caging and biphasic transfer. (a) Temperature dependence of the state of matter for cyclohexane and water. In the temperature window −87 °C < T < 7 °C cyclohexane forms a plastic crystal phase, whereas water is liquid at the temperatures above 0 °C. (b) Interfacial caging employed in the temperature range T > 0 °C. Biphasic transfer is carried at temperatures between 0 and 7 °C in which cyclohexane is plastic crystal and water is liquid. (c) Illustration depicting the biphasic transfer. Graphene is inserted in the biphasic solution (1), the copper is etched (2), the solution is cooled down to 2 °C until the cyclohexane phase solidifies (3), and the cyclohexane phase with graphene adsorbed is transferred onto a substrate (4). In a last step the sample is kept at 2 °C until the cyclohexane sublimates.