Fig. 7
FTIR 2D imaging of a Whatman® paper mock-up sample, featuring a B-BPP ink. (Top row) Pristine inked paper. (Center row) Area where the PST adhesive was removed using a PEMA-DEC gel. (Bottom row) Area where the adhesive was not removed. The corresponding FTIR maps (700 × 700 μm2) show the imaging of the band at 1735 cm−1 (C = O stretching of the acrylate adhesive). (Bottom panel) FTIR Reflectance spectra of the inked paper (pristine and after adhesive removal), and of the adhesive layer. Each spectrum relates to a single pixel (5.5 × 5.5 μ m2) of the corresponding 2D Imaging map