Fig. 7

Distribution of electric field intensities corresponding to the bonding modes of cases 1–4 (from top to bottom) in the x-y plane measured at different planes along z-axis (from left to right), i.e., z = 17.5 nm (the central part of PBNA), z = 0 (the interface between PBNA and silica), z = −50 nm (a distance of 50 nm below the PBNA), and z = −100 nm (a distance of 100 nm below the PBNA), respectively. The electric field intensities (norm, in unit of V/m) are measured at the direction of midpoint along z-axis