Fig. 3: Ex-situ surface characterization of impacted sites on MA-BCP films.

a Schematic of the local deformation induced by the microprojectile on the MA-BCP film with a contact radius (a) and depth (δ). b AFM line scans of three different impacted sites highlighted in Fig. 2b, c. c–e AFM phase images corresponding to impact velocities of 407 ms⁻¹, 414 ms⁻¹, and 515 ms⁻¹, respectively. The dashed line indicates the perimeter of the contact area and the scale bar represents 5 μm. The inset shows a magnified image of the BCP nanostructure taken near the center of the impacted site; the scale bar represents 500 nm. f–h FM images taken on the film surface (z = 0 plane) and corresponding to the contact areas c–e, respectively. The scale bar represents 5 μm.