Figure 7. Variations in current and lateral force signals with the size of the ZnO nanorods. Current, lateral force, and topography images for ( a ) S6, ( b ) S12, ( c ) S18, ( d ) S24, and ( e ) S30 as measured by Probe A. F n is the normal force applied to the ZnO nanorods by the AFM tip. In each figure part, magnified images of the areas marked by boxes and corresponding scatter plots are shown on the right. All images were obtained during trace