Figure 10
From: Graphene fiber: a new material platform for unique applications

The hollow graphene fiber (hGF) micromotor. (a) Scheme of a moving micromotor. A one-end sealed hGF inner-wall modified with Pt nanoparticles propelled in an aqueous H2O2 solution. (b–h) Snapshots of the track for a moving hGF micromotor in a 20 wt% H2O2 solution. Reproduced with permission. Copyright 2012 from Hu et al.25