Fig. 3: Validation of charge transfer between polymer PVP and guest molecules.

Blank controls for the mapping image of fs-TA spectra measured from Py/PMMA (a) and BePe/PMMA (c) film, the mapping image of fs-TA spectra of Py/PVP (b) and BePe/PVP (d) films after activation with 365 nm UV light, respectively.