Figure 2

2D-AFM images of STO films: STO, STO-N116, and STO-N516 (size-2 × 2 µm2). The inset shows 3D-AFM image of respective films.

2D-AFM images of STO films: STO, STO-N116, and STO-N516 (size-2 × 2 µm2). The inset shows 3D-AFM image of respective films.