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Graphene-Foam Cantilever Produced via Simultaneous Foaming and Doping Effect of Organic Coagulant.

Inspired by role of cellular structures which give three-dimensional graphene structures robustness, a new type of graphene cantilever with mechanical resilience is introduced. Here, NH4SCN is incorporated, into graphene oxide (GO) gel by using it as coagulant for GO fiber self-assembly, foaming agent, and dopant. Subsequent thermal treatment of the GO fiber at 600 oC results in the evolution of gaseous species from NH4SCN, yielding internally porous graphene cantilevers (NS-GF cantilevers) The results reveal that NS-GF cantilevers are doped with N and S and thus exhibit higher electrical conductivity (150 S cm-1) than its non-porous counterpart (38.4 S cm-1). Unlike conventional fibers, the NS-GF cantilevers exhibit mechanical resilience by bending under applied mechanical force but reverting to the original position upon release. The tip of the NS-GF cantilevers are coated with magnetic Fe3O4 particles, and fast mechanical movement is achieved by applying the magnetic field. Since the NS-GF cantilevers are highly conductive and elastic, they are employed as bendable magneto-driven electrical switches that could precisely read on/off signals for >10000 cycles. Our approach suggests a robust fabrication strategy to prepare highly electro-conductive and mechanically elastic foam structures by introducing unique organic foaming agents.