Figure 2.

Schematic diagram of (a) the GCM SA and (b) the hollow substrate together with GCM. A graphene monolayer is wrapped around a microfibre. The GCM SA is fixed onto a hollow substrate with a height of h ≈ 1.5 mm.

Schematic diagram of (a) the GCM SA and (b) the hollow substrate together with GCM. A graphene monolayer is wrapped around a microfibre. The GCM SA is fixed onto a hollow substrate with a height of h ≈ 1.5 mm.