Figure 2: Patterning by nanowire motors.

Scanning electron microscope (SEM) images illustrating the nanowire motors with diameters of (a) 200 nm, (b) 400 nm and (c) 1000, nm. Scale bar, 1000, nm. AFM images of topographical three-dimensional (3D) line morphologies generated by nanowire motors with diameters of (d) 200 nm, (e) 400 nm and (f) 1000, nm and speed of 15 μm s⁻¹. The 3D AFM images in d–f are shown with displayed areas of 3 × 3 μm². Maximum height (g) and FWHM (h) of a number of single lines ‘drawn’ by the nanowire motors swimming at different speeds obtained using H₂O₂ concentrations of 0.25, 1 and 5%. Vertical error bars represent 1 s.d. in the pattern height or FWHM (N=20). Horizontal error bars represent one s.d. in the nanomotor movement speed at the fixed fuel concentration (N=20).